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nocontent"> <header id="masthead" class="clearfix"> <a class="masthead-home-link" href="/global"> <img alt="The Conversation" src="https://cdn.theconversation.com/static/tc/@theconversation/ui/dist/esm/logos/logo-en-b159aca2598f351db37072c75294e4c8.svg" /> </a> <form class="masthead-search" action="/global/search" accept-charset="UTF-8" method="get"> <fieldset> <legend>Search</legend> <div class="row"> <div class="input-wrapper"> <label for="q"><i class="icon-search"></i></label> <input type="text" name="q" id="q" value="" placeholder="Search analysis, research, academics…" /> </div> <button type="submit" class="button" value="Search"></button> </div> </fieldset> </form> <div class="masthead-tagline"> Academic rigour, journalistic flair </div> </header> <nav id="primary-navigation" class=" nocontent"> <ol> </ol> </nav> </div> </section> <div id="outer"> <article id="article" class="clearfix has-desktop-magazine has-mobile-magazine" data-id="240499" itemscope itemtype="http://schema.org/Article"> <figure class="magazine"> <div class="image" style="background-image: url(https://images.theconversation.com/files/630643/original/file-20241107-15-titu7u.jpg?ixlib=rb-4.1.0&rect=0%2C170%2C6314%2C3157&q=45&auto=format&w=1356&h=668&fit=crop);"> <div class="placeholder-container" style="--aspect-ratio-percent:66.25%;--background-color:#ae724f"><img alt="A senior woman on her phone" class="lazyloaded" src="https://images.theconversation.com/files/630643/original/file-20241107-15-titu7u.jpg?ixlib=rb-4.1.0&rect=28%2C0%2C6276%2C4149&q=20&auto=format&w=320&fit=clip&dpr=2&usm=12&cs=strip" data-id="630643" itemprop="image"></div> </div> <div class="wrapper"> <figcaption> Brain-training games sell themselves as a way to maintain cognitive function, but the evidence isn’t there yet. <span class="attribution"><a class="source" href="https://www.gettyimages.com/detail/photo/senior-woman-at-home-royalty-free-image/1454830557">Eva-Katalin/E+ via Getty Images</a></span> </figcaption> </div> <div class="magazine-title"> <div class="wrapper"> <header class="content-header-container grid-twelve large-grid-eleven"> <div> <div class="content-header-block"> <h1 class="legacy entry-title instapaper_title" itemprop="headline"> <strong> <span class="nobr">Brain-training</span> games remain unproven, but research shows what sorts of activities do benefit cognitive functioning </strong> </h1> </div> </div> <div class="timestamps"> <time datetime="2024-11-13T13:25:18Z" itemprop="datePublished" content="2024-11-13T13:25:18Z">Published: November 13, 2024 1.25pm GMT</time> </div> </header> </div> </div> </figure> <div class="wrapper"> <div class="content-sidebar grid-four large-grid-four grid-last"> <section class="content-authors"> <div class="content-authors-synopsis"> <a href="#" class="content-authors-toggle"> <i class="icon-caret-down"></i> <i class="icon-caret-up"></i> <span class="nobr">Ian McDonough</span>, <span class="nobr">Michael Dulas</span>, <em class="institution_name">Binghamton University, State University of New York</em> </a> </div> <div class="content-authors-group"> <h3 class="border">Authors</h3> <ol> <li class="vcard" id="author-603736" itemprop="author" itemscope="" itemtype="http://schema.org/Person"> <a rel="author" itemprop="url" href="/profiles/ian-mcdonough-2226385"> <img alt="" class="lazyload" data-src="https://cdn.theconversation.com/avatars/2226385/width170/image-20241004-15-csyii9.jpg" src="https://cdn.theconversation.com/static/tc/author/width170_default-bea415b3a0223821a698f6e3f6d5ab99.jpg" itemprop="image"> <span class="fn author-name" itemprop="name"> Ian McDonough </span> </a> <p class="role"> Associate Professor of Psychology, Binghamton University, State University of New York </p> </li> <li class="vcard" id="author-603737" itemprop="author" itemscope="" itemtype="http://schema.org/Person"> <a rel="author" itemprop="url" href="/profiles/michael-dulas-2226386"> <img alt="" class="lazyload" data-src="https://cdn.theconversation.com/avatars/2226386/width170/image-20241004-16-g3l6bk.jpg" src="https://cdn.theconversation.com/static/tc/author/width170_default-bea415b3a0223821a698f6e3f6d5ab99.jpg" itemprop="image"> <span class="fn author-name" itemprop="name"> Michael Dulas </span> </a> <p class="role"> Assistant Professor of Psychology, Binghamton University, State University of New York </p> </li> </ol> </div> </section> <section class="content-disclosure-statement"> <h3 class="border">Disclosure statement</h3> <p><span>This research was supported by two National Institute on Aging grants.</span></p> <p><span>Michael Dulas does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.</span></p> </section> <section class="content-partners"> <h3 class="border">Partners</h3> <p class="disclosure-logo clearfix"><a 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href="fb-messenger://share?link=https%3A%2F%2Ftheconversation.com%2Fbrain-training-games-remain-unproven-but-research-shows-what-sorts-of-activities-do-benefit-cognitive-functioning-240499%3Futm_source%3Dfb_messenger%26utm_medium%3Dbylinefb_messenger_button"><i class="icon-fb-messenger"></i> <span>Messenger</span></a> </div> </aside> </div> <div class="grid-ten large-grid-nine grid-last content-body content entry-content instapaper_body inline-promos" itemprop="articleBody"> <p>Some 2.3 million of U.S. adults over 65 – more than 4% – have a <a href="https://www.cdc.gov/nchs/data/nhsr/nhsr203.pdf">diagnosis of dementia</a>. But even without a diagnosis, a certain amount of cognitive decline is normal as age sets in. </p> <p>And whether it’s due to fear of cognitive decline or noticing lapses in cognition when we are stressed, many of us have had moments when we thought we could use an extra cognitive boost.</p> <p>The good news is research has shown that people can make changes throughout adulthood that can <a href="http://doi.org/10.1016/S0140-6736(24)01296-0">help prevent or delay cognitive decline</a> and even reduce their risk of dementia. These include <a href="http://doi.org/10.1016/s0140-6736(20)30367-6">quitting smoking</a> and properly managing blood pressure.</p> <p>In addition to these lifestyle changes, many people are turning to brain-training games, which claim to optimize your brain’s efficiency and capacity at any age. The makers of brain-training apps and games claim their products can do everything from staving off cognitive decline to <a href="https://doi.org/10.1073/pnas.0801268105">improving your IQ</a>.</p><div class="slot clear" data-id="17"> <div class="inline-promos-skeleton"> <h5></h5> <button></button> </div> </div> <p>But so far these <a href="https://doi.org/10.1177/1529100616661983">claims have been met with mixed evidence</a>.</p> <p>We are <a href="https://scholar.google.com/citations?user=FwZVLMUAAAAJ&hl=en&oi=ao">cognitive neuroscientists</a> who <a href="https://scholar.google.com/citations?user=6y-zGfsAAAAJ&hl=en&oi=ao">focus on brain health</a> across the adult lifespan. We study how the brain informs cognition and the ways we can use brain imaging to understand cognitive and brain-training interventions. We aim to understand how our brains change naturally over time as well as what we can do about it.</p> <p>Ongoing research shows what actually happens to the brain when it is engaged in new learning, offering a window into how people can sustain their brain health and how brain-training games can play a role. We believe these studies offer some strategies to train your brain the right way.</p> <h2>Brain training fact vs. fiction</h2> <p><a href="http://doi.org/10.1007/s41465-017-0040-5">Brain training</a> is a set of tasks, often computerized, based on well-known tests to measure a type of cognition, but in a gamified manner.</p> <p>Most brain-training games were designed to help participants master one or more specific skills. One example is a game that shows you a letter and number combination, where sometimes you must quickly identify whether the letter is even or odd, while other times you must switch to deciding whether the letter is a consonant or vowel. The game may increase in difficulty by requiring you to accomplish the task within a set time limit. </p> <p>Such games are designed to require a high level of attention, fast processing speed and a flexible mind to alternate between the rules, known as <a href="https://my.clevelandclinic.org/health/articles/executive-function">executive functioning</a>.</p> <p>But it turns out that the specific skills learned in these games often do not translate to more general, real-world applications. Whether brain games meet their end goal of lasting cognitive improvement across a number of areas is still <a href="https://doi.org/10.1037/ppm0000204">highly debated among psychologists</a>. To make such claims requires rigorous evidence that playing a specific game improves cognitive or brain performance. </p> <p>In 2016, in fact, the Federal Trade Commission <a href="https://www.ftc.gov/news-events/news/press-releases/2016/01/lumosity-pay-2-million-settle-ftc-deceptive-advertising-charges-its-brain-training-program">issued a US$50 million penalty</a> to one of the most popular brain-training games at the time, Lumosity, for misleading consumers into thinking that they could achieve higher levels of mental performance at work or at school and prevent or delay cognitive decline by using its product.</p> <p>If improving on a brain game helps the player get better only at that or highly similar games, maybe game developers need a different approach.</p> <figure> <div class="placeholder-container" style="--aspect-ratio-percent:56.25%;--background-color:#fff"><iframe class="lazyload" data-src="https://www.youtube.com/embed/eVX9x7Zq-NA?wmode=transparent&start=0" frameborder="0" allowfullscreen="" width="100%" height="400"></iframe></div> <figcaption><span class="caption">Improving our brain function is possible, even if many of the claims made by developers of brain-training games are unsupported by scientific evidence.</span></figcaption> </figure> <h2>Put some challenge into it</h2> <p>In a study dubbed the <a href="https://doi.org/10.1177/0956797613499592">Synapse Project</a>, in which one of us, Ian McDonough, helped assess the final outcomes, one group of participants were tasked with engaging in a new activity with which they had little experience. They were assigned to either digital photography or quilting. Though these activities were not games, they were meant to be engaging, challenging and done in a social environment. </p> <p>Another group was assigned activities that involved little active learning, such as engaging in themed activities related to travel or cooking, or more solitary activities such as solving crossword puzzles, listening to music or watching classic movies. These groups met for 15 hours a week over 14 weeks. All participants were tested at the beginning and end of the study on various cognitive abilities.</p> <p>Those assigned to the new, challenging activities showed significant gains in their memory, processing speed and reasoning abilities relative to those assigned to the less challenging activities. None of the participants were directly trained on these cognitive tests, which means that the challenging activities enhanced skills that transferred to new situations, such as remembering a list of words or solving abstract problems.</p> <p><a href="https://doi.org/10.3233/RNN-150533">Brain scans of participants</a> showed that over the course of the study, those engaged in the more challenging activities increased their <a href="https://doi.org/10.1016/j.neubiorev.2009.04.001">neural efficiency</a>. In other words, their brains didn’t have to work as hard to solve problems or recall information.</p> <p>The study also showed that the more time participants spent on their projects, <a href="https://doi.org/10.3233/RNN-150533">the bigger their brain gains</a> and the better their memory was at the end of the 14 weeks.</p> <p>One difference between the types of activities engaged in the Synapse Project and traditional brain training is whether activities are done in a group or alone. Although <a href="https://theconversation.com/the-best-exercises-to-boost-your-brain-health-after-60-237162">other studies</a> have found a benefit to social interaction, the Synapse Project found no difference between the social and solitary activities in the low-challenge group. So, challenge rather than the social components seems to be the driver of maintaining cognitive and brain health.</p> <h2>What you can do to maintain a healthy brain</h2> <p>You might be thinking it’s time to take up digital photography or quilting. But in the end, it’s not about those specific tasks. What matters most is that you challenge yourself, which often comes naturally when doing something new.</p> <figure class="align-center zoomable"> <a href="https://images.theconversation.com/files/630739/original/file-20241107-15-3ff438.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=1000&fit=clip"><div class="placeholder-container" style="--aspect-ratio-percent:66.71087533156499%;--background-color:#a99467"><img alt="Man and grandson making pottery together." class="lazyload" data-src="https://images.theconversation.com/files/630739/original/file-20241107-15-3ff438.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=754&fit=clip" data-srcset="https://images.theconversation.com/files/630739/original/file-20241107-15-3ff438.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=600&h=400&fit=crop&dpr=1 600w, https://images.theconversation.com/files/630739/original/file-20241107-15-3ff438.jpg?ixlib=rb-4.1.0&q=30&auto=format&w=600&h=400&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/630739/original/file-20241107-15-3ff438.jpg?ixlib=rb-4.1.0&q=15&auto=format&w=600&h=400&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/630739/original/file-20241107-15-3ff438.jpg?ixlib=rb-4.1.0&q=45&auto=format&w=754&h=503&fit=crop&dpr=1 754w, https://images.theconversation.com/files/630739/original/file-20241107-15-3ff438.jpg?ixlib=rb-4.1.0&q=30&auto=format&w=754&h=503&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/630739/original/file-20241107-15-3ff438.jpg?ixlib=rb-4.1.0&q=15&auto=format&w=754&h=503&fit=crop&dpr=3 2262w" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px"></div></a> <figcaption> <span class="caption">Learning a new skill, alone or in a social setting, is proven to improve cognition.</span> <span class="attribution"><a class="source" href="https://www.gettyimages.com/detail/photo/grandfather-and-grandson-forming-pottery-on-wheel-royalty-free-image/554372183?phrase=learning+art&searchscope=image%2Cfilm&adppopup=true">Jose Luis Pelaez Inc/DigitalVision via Getty Images</a></span> </figcaption> </figure> <p>The new learning that often is accompanied by a sense of effort – and sometimes frustration – requires accessing the resources in the <a href="https://my.clevelandclinic.org/health/body/24501-frontal-lobe">frontal lobe</a>, which manages thinking and judgment, and the <a href="https://my.clevelandclinic.org/health/body/24628-parietal-lobe">parietal lobe</a>, which processes attention and combines different sensory inputs. These regions constantly talk to each other to keep the mind adaptable in all kinds of situations and prevent the brain from going into “habit mode.”</p> <p>Where does this leave us? Well, on the one hand, games touted as “training your brain” may not be the best solution compared with other routes to improving cognition. </p> <p>Ironically, you might already be training your brain by playing effortful games that are not marketed as “brain training.” For example, <a href="http://doi.org/10.1371/journal.pone.0055518">games such as Tetris</a> or <a href="http://doi.org/10.1037/a0013494">real-time strategy games</a> such as Rise of Nations have shown improvements in players’ cognition. Research has even shown that <a href="https://doi.org/10.1371/journal.pone.0187779">playing Super Mario 64</a> can result in increases in brain volume in regions such as the <a href="https://my.clevelandclinic.org/health/body/hippocampus">hippocampus</a>, the memory center of the brain.</p> <p>While little evidence suggests that any brain-training game or program globally improves cognition, some may improve specific aspects of it. As with other activities, challenge is key.</p> <p>If you’re a word person, try a numbers-based game. If you love math, consider a word game or puzzle. Choosing a task that makes you feel uncomfortable gives you the best shot at maintaining and even improving your cognition. 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C{constructor(e){this.options=e,this.supportedLngs=this.options.supportedLngs||!1,this.logger=o.create("languageUtils")}getScriptPartFromCode(e){if(!(e=S(e))||e.indexOf("-")<0)return null;const t=e.split("-");return 2===t.length?null:(t.pop(),"x"===t[t.length-1].toLowerCase()?null:this.formatLanguageCode(t.join("-")))}getLanguagePartFromCode(e){if(!(e=S(e))||e.indexOf("-")<0)return e;const t=e.split("-");return this.formatLanguageCode(t[0])}formatLanguageCode(e){if("string"==typeof e&&e.indexOf("-")>-1){if("undefined"!=typeof Intl&&void 0!==Intl.getCanonicalLocales)try{let t=Intl.getCanonicalLocales(e)[0];if(t&&this.options.lowerCaseLng&&(t=t.toLowerCase()),t)return t}catch(e){}const t=["hans","hant","latn","cyrl","cans","mong","arab"];let s=e.split("-");return this.options.lowerCaseLng?s=s.map((e=>e.toLowerCase())):2===s.length?(s[0]=s[0].toLowerCase(),s[1]=s[1].toUpperCase(),t.indexOf(s[1].toLowerCase())>-1&&(s[1]=R(s[1].toLowerCase()))):3===s.length&&(s[0]=s[0].toLowerCase(),2===s[1].length&&(s[1]=s[1].toUpperCase()),"sgn"!==s[0]&&2===s[2].length&&(s[2]=s[2].toUpperCase()),t.indexOf(s[1].toLowerCase())>-1&&(s[1]=R(s[1].toLowerCase())),t.indexOf(s[2].toLowerCase())>-1&&(s[2]=R(s[2].toLowerCase()))),s.join("-")}return this.options.cleanCode||this.options.lowerCaseLng?e.toLowerCase():e}isSupportedCode(e){return("languageOnly"===this.options.load||this.options.nonExplicitSupportedLngs)&&(e=this.getLanguagePartFromCode(e)),!this.supportedLngs||!this.supportedLngs.length||this.supportedLngs.indexOf(e)>-1}getBestMatchFromCodes(e){if(!e)return null;let t;return e.forEach((e=>{if(t)return;const s=this.formatLanguageCode(e);this.options.supportedLngs&&!this.isSupportedCode(s)||(t=s)})),!t&&this.options.supportedLngs&&e.forEach((e=>{if(t)return;const s=this.getLanguagePartFromCode(e);if(this.isSupportedCode(s))return t=s;t=this.options.supportedLngs.find((e=>e===s?e:e.indexOf("-")<0&&s.indexOf("-")<0?void 0:e.indexOf("-")>0&&s.indexOf("-")<0&&e.substring(0,e.indexOf("-"))===s||0===e.indexOf(s)&&s.length>1?e:void 0))})),t||(t=this.getFallbackCodes(this.options.fallbackLng)[0]),t}getFallbackCodes(e,t){if(!e)return[];if("function"==typeof e&&(e=e(t)),"string"==typeof e&&(e=[e]),Array.isArray(e))return e;if(!t)return e.default||[];let s=e[t];return s||(s=e[this.getScriptPartFromCode(t)]),s||(s=e[this.formatLanguageCode(t)]),s||(s=e[this.getLanguagePartFromCode(t)]),s||(s=e.default),s||[]}toResolveHierarchy(e,t){const s=this.getFallbackCodes(t||this.options.fallbackLng||[],e),i=[],n=e=>{e&&(this.isSupportedCode(e)?i.push(e):this.logger.warn(`rejecting language code not found in supportedLngs: ${e}`))};return"string"==typeof e&&(e.indexOf("-")>-1||e.indexOf("_")>-1)?("languageOnly"!==this.options.load&&n(this.formatLanguageCode(e)),"languageOnly"!==this.options.load&&"currentOnly"!==this.options.load&&n(this.getScriptPartFromCode(e)),"currentOnly"!==this.options.load&&n(this.getLanguagePartFromCode(e))):"string"==typeof e&&n(this.formatLanguageCode(e)),s.forEach((e=>{i.indexOf(e)<0&&n(this.formatLanguageCode(e))})),i}}let N=[{lngs:["ach","ak","am","arn","br","fil","gun","ln","mfe","mg","mi","oc","pt","pt-BR","tg","tl","ti","tr","uz","wa"],nr:[1,2],fc:1},{lngs:["af","an","ast","az","bg","bn","ca","da","de","dev","el","en","eo","es","et","eu","fi","fo","fur","fy","gl","gu","ha","hi","hu","hy","ia","it","kk","kn","ku","lb","mai","ml","mn","mr","nah","nap","nb","ne","nl","nn","no","nso","pa","pap","pms","ps","pt-PT","rm","sco","se","si","so","son","sq","sv","sw","ta","te","tk","ur","yo"],nr:[1,2],fc:2},{lngs:["ay","bo","cgg","fa","ht","id","ja","jbo","ka","km","ko","ky","lo","ms","sah","su","th","tt","ug","vi","wo","zh"],nr:[1],fc:3},{lngs:["be","bs","cnr","dz","hr","ru","sr","uk"],nr:[1,2,5],fc:4},{lngs:["ar"],nr:[0,1,2,3,11,100],fc:5},{lngs:["cs","sk"],nr:[1,2,5],fc:6},{lngs:["csb","pl"],nr:[1,2,5],fc:7},{lngs:["cy"],nr:[1,2,3,8],fc:8},{lngs:["fr"],nr:[1,2],fc:9},{lngs:["ga"],nr:[1,2,3,7,11],fc:10},{lngs:["gd"],nr:[1,2,3,20],fc:11},{lngs:["is"],nr:[1,2],fc:12},{lngs:["jv"],nr:[0,1],fc:13},{lngs:["kw"],nr:[1,2,3,4],fc:14},{lngs:["lt"],nr:[1,2,10],fc:15},{lngs:["lv"],nr:[1,2,0],fc:16},{lngs:["mk"],nr:[1,2],fc:17},{lngs:["mnk"],nr:[0,1,2],fc:18},{lngs:["mt"],nr:[1,2,11,20],fc:19},{lngs:["or"],nr:[2,1],fc:2},{lngs:["ro"],nr:[1,2,20],fc:20},{lngs:["sl"],nr:[5,1,2,3],fc:21},{lngs:["he","iw"],nr:[1,2,20,21],fc:22}],j={1:e=>Number(e>1),2:e=>Number(1!=e),3:e=>0,4:e=>Number(e%10==1&&e%100!=11?0:e%10>=2&&e%10<=4&&(e%100<10||e%100>=20)?1:2),5:e=>Number(0==e?0:1==e?1:2==e?2:e%100>=3&&e%100<=10?3:e%100>=11?4:5),6:e=>Number(1==e?0:e>=2&&e<=4?1:2),7:e=>Number(1==e?0:e%10>=2&&e%10<=4&&(e%100<10||e%100>=20)?1:2),8:e=>Number(1==e?0:2==e?1:8!=e&&11!=e?2:3),9:e=>Number(e>=2),10:e=>Number(1==e?0:2==e?1:e<7?2:e<11?3:4),11:e=>Number(1==e||11==e?0:2==e||12==e?1:e>2&&e<20?2:3),12:e=>Number(e%10!=1||e%100==11),13:e=>Number(0!==e),14:e=>Number(1==e?0:2==e?1:3==e?2:3),15:e=>Number(e%10==1&&e%100!=11?0:e%10>=2&&(e%100<10||e%100>=20)?1:2),16:e=>Number(e%10==1&&e%100!=11?0:0!==e?1:2),17:e=>Number(1==e||e%10==1&&e%100!=11?0:1),18:e=>Number(0==e?0:1==e?1:2),19:e=>Number(1==e?0:0==e||e%100>1&&e%100<11?1:e%100>10&&e%100<20?2:3),20:e=>Number(1==e?0:0==e||e%100>0&&e%100<20?1:2),21:e=>Number(e%100==1?1:e%100==2?2:e%100==3||e%100==4?3:0),22:e=>Number(1==e?0:2==e?1:(e<0||e>10)&&e%10==0?2:3)};const $=["v1","v2","v3"],A=["v4"],E={zero:0,one:1,two:2,few:3,many:4,other:5};class I{constructor(e){let t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};this.languageUtils=e,this.options=t,this.logger=o.create("pluralResolver"),this.options.compatibilityJSON&&!A.includes(this.options.compatibilityJSON)||"undefined"!=typeof Intl&&Intl.PluralRules||(this.options.compatibilityJSON="v3",this.logger.error("Your environment seems not to be Intl API compatible, use an Intl.PluralRules polyfill. Will fallback to the compatibilityJSON v3 format handling.")),this.rules=(()=>{const e={};return N.forEach((t=>{t.lngs.forEach((s=>{e[s]={numbers:t.nr,plurals:j[t.fc]}}))})),e})(),this.pluralRulesCache={}}addRule(e,t){this.rules[e]=t}clearCache(){this.pluralRulesCache={}}getRule(e){let t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};if(this.shouldUseIntlApi())try{const s=S("dev"===e?"en":e),i=t.ordinal?"ordinal":"cardinal",n=JSON.stringify({cleanedCode:s,type:i});if(n in this.pluralRulesCache)return this.pluralRulesCache[n];const o=new Intl.PluralRules(s,{type:i});return this.pluralRulesCache[n]=o,o}catch(e){return}return this.rules[e]||this.rules[this.languageUtils.getLanguagePartFromCode(e)]}needsPlural(e){let t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};const s=this.getRule(e,t);return this.shouldUseIntlApi()?s&&s.resolvedOptions().pluralCategories.length>1:s&&s.numbers.length>1}getPluralFormsOfKey(e,t){let s=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};return this.getSuffixes(e,s).map((e=>`${t}${e}`))}getSuffixes(e){let t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};const s=this.getRule(e,t);return s?this.shouldUseIntlApi()?s.resolvedOptions().pluralCategories.sort(((e,t)=>E[e]-E[t])).map((e=>`${this.options.prepend}${t.ordinal?`ordinal${this.options.prepend}`:""}${e}`)):s.numbers.map((s=>this.getSuffix(e,s,t))):[]}getSuffix(e,t){let s=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};const i=this.getRule(e,s);return i?this.shouldUseIntlApi()?`${this.options.prepend}${s.ordinal?`ordinal${this.options.prepend}`:""}${i.select(t)}`:this.getSuffixRetroCompatible(i,t):(this.logger.warn(`no plural rule found for: ${e}`),"")}getSuffixRetroCompatible(e,t){const s=e.noAbs?e.plurals(t):e.plurals(Math.abs(t));let i=e.numbers[s];this.options.simplifyPluralSuffix&&2===e.numbers.length&&1===e.numbers[0]&&(2===i?i="plural":1===i&&(i=""));const n=()=>this.options.prepend&&i.toString()?this.options.prepend+i.toString():i.toString();return"v1"===this.options.compatibilityJSON?1===i?"":"number"==typeof i?`_plural_${i.toString()}`:n():"v2"===this.options.compatibilityJSON||this.options.simplifyPluralSuffix&&2===e.numbers.length&&1===e.numbers[0]?n():this.options.prepend&&s.toString()?this.options.prepend+s.toString():s.toString()}shouldUseIntlApi(){return!$.includes(this.options.compatibilityJSON)}}const T=function(e,t,s){let i=arguments.length>3&&void 0!==arguments[3]?arguments[3]:".",n=!(arguments.length>4&&void 0!==arguments[4])||arguments[4],o=((e,t,s)=>{const i=d(e,s);return void 0!==i?i:d(t,s)})(e,t,s);return!o&&n&&"string"==typeof s&&(o=k(e,s,i),void 0===o&&(o=k(t,s,i))),o},D=e=>e.replace(/\$/g,"$$$$");class F{constructor(){let e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};this.logger=o.create("interpolator"),this.options=e,this.format=e.interpolation&&e.interpolation.format||(e=>e),this.init(e)}init(){let e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};e.interpolation||(e.interpolation={escapeValue:!0});const{escape:t,escapeValue:s,useRawValueToEscape:i,prefix:n,prefixEscaped:o,suffix:r,suffixEscaped:a,formatSeparator:l,unescapeSuffix:c,unescapePrefix:u,nestingPrefix:h,nestingPrefixEscaped:p,nestingSuffix:g,nestingSuffixEscaped:d,nestingOptionsSeparator:f,maxReplaces:y,alwaysFormat:b}=e.interpolation;this.escape=void 0!==t?t:v,this.escapeValue=void 0===s||s,this.useRawValueToEscape=void 0!==i&&i,this.prefix=n?m(n):o||"{{",this.suffix=r?m(r):a||"}}",this.formatSeparator=l||",",this.unescapePrefix=c?"":u||"-",this.unescapeSuffix=this.unescapePrefix?"":c||"",this.nestingPrefix=h?m(h):p||m("$t("),this.nestingSuffix=g?m(g):d||m(")"),this.nestingOptionsSeparator=f||",",this.maxReplaces=y||1e3,this.alwaysFormat=void 0!==b&&b,this.resetRegExp()}reset(){this.options&&this.init(this.options)}resetRegExp(){const e=(e,t)=>e&&e.source===t?(e.lastIndex=0,e):new RegExp(t,"g");this.regexp=e(this.regexp,`${this.prefix}(.+?)${this.suffix}`),this.regexpUnescape=e(this.regexpUnescape,`${this.prefix}${this.unescapePrefix}(.+?)${this.unescapeSuffix}${this.suffix}`),this.nestingRegexp=e(this.nestingRegexp,`${this.nestingPrefix}(.+?)${this.nestingSuffix}`)}interpolate(e,t,s,i){let n,o,r;const a=this.options&&this.options.interpolation&&this.options.interpolation.defaultVariables||{},c=e=>{if(e.indexOf(this.formatSeparator)<0){const n=T(t,a,e,this.options.keySeparator,this.options.ignoreJSONStructure);return this.alwaysFormat?this.format(n,void 0,s,{...i,...t,interpolationkey:e}):n}const n=e.split(this.formatSeparator),o=n.shift().trim(),r=n.join(this.formatSeparator).trim();return this.format(T(t,a,o,this.options.keySeparator,this.options.ignoreJSONStructure),r,s,{...i,...t,interpolationkey:o})};this.resetRegExp();const u=i&&i.missingInterpolationHandler||this.options.missingInterpolationHandler,h=i&&i.interpolation&&void 0!==i.interpolation.skipOnVariables?i.interpolation.skipOnVariables:this.options.interpolation.skipOnVariables;return[{regex:this.regexpUnescape,safeValue:e=>D(e)},{regex:this.regexp,safeValue:e=>this.escapeValue?D(this.escape(e)):D(e)}].forEach((t=>{for(r=0;n=t.regex.exec(e);){const s=n[1].trim();if(o=c(s),void 0===o)if("function"==typeof u){const t=u(e,n,i);o="string"==typeof t?t:""}else if(i&&Object.prototype.hasOwnProperty.call(i,s))o="";else{if(h){o=n[0];continue}this.logger.warn(`missed to pass in variable ${s} for interpolating ${e}`),o=""}else"string"==typeof o||this.useRawValueToEscape||(o=l(o));const a=t.safeValue(o);if(e=e.replace(n[0],a),h?(t.regex.lastIndex+=o.length,t.regex.lastIndex-=n[0].length):t.regex.lastIndex=0,r++,r>=this.maxReplaces)break}})),e}nest(e,t){let s,i,n,o=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};const r=(e,t)=>{const s=this.nestingOptionsSeparator;if(e.indexOf(s)<0)return e;const i=e.split(new RegExp(`${s}[ ]*{`));let o=`{${i[1]}`;e=i[0],o=this.interpolate(o,n);const r=o.match(/'/g),a=o.match(/"/g);(r&&r.length%2==0&&!a||a.length%2!=0)&&(o=o.replace(/'/g,'"'));try{n=JSON.parse(o),t&&(n={...t,...n})}catch(t){return this.logger.warn(`failed parsing options string in nesting for key ${e}`,t),`${e}${s}${o}`}return n.defaultValue&&n.defaultValue.indexOf(this.prefix)>-1&&delete n.defaultValue,e};for(;s=this.nestingRegexp.exec(e);){let a=[];n={...o},n=n.replace&&"string"!=typeof n.replace?n.replace:n,n.applyPostProcessor=!1,delete n.defaultValue;let c=!1;if(-1!==s[0].indexOf(this.formatSeparator)&&!/{.*}/.test(s[1])){const e=s[1].split(this.formatSeparator).map((e=>e.trim()));s[1]=e.shift(),a=e,c=!0}if(i=t(r.call(this,s[1].trim(),n),n),i&&s[0]===e&&"string"!=typeof i)return i;"string"!=typeof i&&(i=l(i)),i||(this.logger.warn(`missed to resolve ${s[1]} for nesting 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Intl.ListFormat(e,{...t});return e=>s.format(e)}))},this.init(e)}init(e){const t=(arguments.length>1&&void 0!==arguments[1]?arguments[1]:{interpolation:{}}).interpolation;this.formatSeparator=t.formatSeparator?t.formatSeparator:t.formatSeparator||","}add(e,t){this.formats[e.toLowerCase().trim()]=t}addCached(e,t){this.formats[e.toLowerCase().trim()]=V(t)}format(e,t,s){let i=arguments.length>3&&void 0!==arguments[3]?arguments[3]:{};const n=t.split(this.formatSeparator);if(n.length>1&&n[0].indexOf("(")>1&&n[0].indexOf(")")<0&&n.find((e=>e.indexOf(")")>-1))){const e=n.findIndex((e=>e.indexOf(")")>-1));n[0]=[n[0],...n.splice(1,e)].join(this.formatSeparator)}return n.reduce(((e,t)=>{const{formatName:n,formatOptions:o}=(e=>{let t=e.toLowerCase().trim();const s={};if(e.indexOf("(")>-1){const i=e.split("(");t=i[0].toLowerCase().trim();const n=i[1].substring(0,i[1].length-1);"currency"===t&&n.indexOf(":")<0?s.currency||(s.currency=n.trim()):"relativetime"===t&&n.indexOf(":")<0?s.range||(s.range=n.trim()):n.split(";").forEach((e=>{if(e){const[t,...i]=e.split(":"),n=i.join(":").trim().replace(/^'+|'+$/g,""),o=t.trim();s[o]||(s[o]=n),"false"===n&&(s[o]=!1),"true"===n&&(s[o]=!0),isNaN(n)||(s[o]=parseInt(n,10))}}))}return{formatName:t,formatOptions:s}})(t);if(this.formats[n]){let t=e;try{const r=i&&i.formatParams&&i.formatParams[i.interpolationkey]||{},a=r.locale||r.lng||i.locale||i.lng||s;t=this.formats[n](e,a,{...o,...i,...r})}catch(e){this.logger.warn(e)}return t}return this.logger.warn(`there was no format function for ${n}`),e}),e)}}class M extends r{constructor(e,t,s){let i=arguments.length>3&&void 0!==arguments[3]?arguments[3]:{};super(),this.backend=e,this.store=t,this.services=s,this.languageUtils=s.languageUtils,this.options=i,this.logger=o.create("backendConnector"),this.waitingReads=[],this.maxParallelReads=i.maxParallelReads||10,this.readingCalls=0,this.maxRetries=i.maxRetries>=0?i.maxRetries:5,this.retryTimeout=i.retryTimeout>=1?i.retryTimeout:350,this.state={},this.queue=[],this.backend&&this.backend.init&&this.backend.init(s,i.backend,i)}queueLoad(e,t,s,i){const n={},o={},r={},a={};return e.forEach((e=>{let i=!0;t.forEach((t=>{const r=`${e}|${t}`;!s.reload&&this.store.hasResourceBundle(e,t)?this.state[r]=2:this.state[r]<0||(1===this.state[r]?void 0===o[r]&&(o[r]=!0):(this.state[r]=1,i=!1,void 0===o[r]&&(o[r]=!0),void 0===n[r]&&(n[r]=!0),void 0===a[t]&&(a[t]=!0)))})),i||(r[e]=!0)})),(Object.keys(n).length||Object.keys(o).length)&&this.queue.push({pending:o,pendingCount:Object.keys(o).length,loaded:{},errors:[],callback:i}),{toLoad:Object.keys(n),pending:Object.keys(o),toLoadLanguages:Object.keys(r),toLoadNamespaces:Object.keys(a)}}loaded(e,t,s){const i=e.split("|"),n=i[0],o=i[1];t&&this.emit("failedLoading",n,o,t),!t&&s&&this.store.addResourceBundle(n,o,s,void 0,void 0,{skipCopy:!0}),this.state[e]=t?-1:2,t&&s&&(this.state[e]=0);const r={};this.queue.forEach((s=>{((e,t,s,i)=>{const{obj:n,k:o}=p(e,t,Object);n[o]=n[o]||[],n[o].push(s)})(s.loaded,[n],o),((e,t)=>{void 0!==e.pending[t]&&(delete e.pending[t],e.pendingCount--)})(s,e),t&&s.errors.push(t),0!==s.pendingCount||s.done||(Object.keys(s.loaded).forEach((e=>{r[e]||(r[e]={});const t=s.loaded[e];t.length&&t.forEach((t=>{void 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s=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{},i=arguments.length>3?arguments[3]:void 0;if(!this.backend)return this.logger.warn("No backend was added via i18next.use. 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H=()=>({debug:!1,initImmediate:!0,ns:["translation"],defaultNS:["translation"],fallbackLng:["dev"],fallbackNS:!1,supportedLngs:!1,nonExplicitSupportedLngs:!1,load:"all",preload:!1,simplifyPluralSuffix:!0,keySeparator:".",nsSeparator:":",pluralSeparator:"_",contextSeparator:"_",partialBundledLanguages:!1,saveMissing:!1,updateMissing:!1,saveMissingTo:"fallback",saveMissingPlurals:!0,missingKeyHandler:!1,missingInterpolationHandler:!1,postProcess:!1,postProcessPassResolved:!1,returnNull:!1,returnEmptyString:!0,returnObjects:!1,joinArrays:!1,returnedObjectHandler:!1,parseMissingKeyHandler:!1,appendNamespaceToMissingKey:!1,appendNamespaceToCIMode:!1,overloadTranslationOptionHandler:e=>{let t={};if("object"==typeof e[1]&&(t=e[1]),"string"==typeof e[1]&&(t.defaultValue=e[1]),"string"==typeof e[2]&&(t.tDescription=e[2]),"object"==typeof e[2]||"object"==typeof e[3]){const s=e[3]||e[2];Object.keys(s).forEach((e=>{t[e]=s[e]}))}return t},interpolation:{escapeValue:!0,format:e=>e,prefix:"{{",suffix:"}}",formatSeparator:",",unescapePrefix:"-",nestingPrefix:"$t(",nestingSuffix:")",nestingOptionsSeparator:",",maxReplaces:1e3,skipOnVariables:!0}}),K=e=>("string"==typeof e.ns&&(e.ns=[e.ns]),"string"==typeof e.fallbackLng&&(e.fallbackLng=[e.fallbackLng]),"string"==typeof e.fallbackNS&&(e.fallbackNS=[e.fallbackNS]),e.supportedLngs&&e.supportedLngs.indexOf("cimode")<0&&(e.supportedLngs=e.supportedLngs.concat(["cimode"])),e),J=()=>{};class z extends r{constructor(){let e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=arguments.length>1?arguments[1]:void 0;var s;if(super(),this.options=K(e),this.services={},this.logger=o,this.modules={external:[]},s=this,Object.getOwnPropertyNames(Object.getPrototypeOf(s)).forEach((e=>{"function"==typeof s[e]&&(s[e]=s[e].bind(s))})),t&&!this.isInitialized&&!e.isClone){if(!this.options.initImmediate)return this.init(e,t),this;setTimeout((()=>{this.init(e,t)}),0)}}init(){var 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0,this.setResolvedLanguage(e)},o=(e,o)=>{o?(n(o),this.translator.changeLanguage(o),this.isLanguageChangingTo=void 0,this.emit("languageChanged",o),this.logger.log("languageChanged",o)):this.isLanguageChangingTo=void 0,i.resolve((function(){return s.t(...arguments)})),t&&t(e,(function(){return s.t(...arguments)}))},r=t=>{e||t||!this.services.languageDetector||(t=[]);const s="string"==typeof t?t:this.services.languageUtils.getBestMatchFromCodes(t);s&&(this.language||n(s),this.translator.language||this.translator.changeLanguage(s),this.services.languageDetector&&this.services.languageDetector.cacheUserLanguage&&this.services.languageDetector.cacheUserLanguage(s)),this.loadResources(s,(e=>{o(e,s)}))};return e||!this.services.languageDetector||this.services.languageDetector.async?!e&&this.services.languageDetector&&this.services.languageDetector.async?0===this.services.languageDetector.detect.length?this.services.languageDetector.detect().then(r):this.services.languageDetector.detect(r):r(e):r(this.services.languageDetector.detect()),i}getFixedT(e,t,s){var i=this;const n=function(e,t){let o;if("object"!=typeof t){for(var r=arguments.length,a=new Array(r>2?r-2:0),l=2;l<r;l++)a[l-2]=arguments[l];o=i.options.overloadTranslationOptionHandler([e,t].concat(a))}else o={...t};o.lng=o.lng||n.lng,o.lngs=o.lngs||n.lngs,o.ns=o.ns||n.ns,""!==o.keyPrefix&&(o.keyPrefix=o.keyPrefix||s||n.keyPrefix);const c=i.options.keySeparator||".";let u;return u=o.keyPrefix&&Array.isArray(e)?e.map((e=>`${o.keyPrefix}${c}${e}`)):o.keyPrefix?`${o.keyPrefix}${c}${e}`:e,i.t(u,o)};return"string"==typeof e?n.lng=e:n.lngs=e,n.ns=t,n.keyPrefix=s,n}t(){return this.translator&&this.translator.translate(...arguments)}exists(){return this.translator&&this.translator.exists(...arguments)}setDefaultNamespace(e){this.options.defaultNS=e}hasLoadedNamespace(e){let t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};if(!this.isInitialized)return this.logger.warn("hasLoadedNamespace: i18next was not initialized",this.languages),!1;if(!this.languages||!this.languages.length)return this.logger.warn("hasLoadedNamespace: i18n.languages were undefined or empty",this.languages),!1;const s=t.lng||this.resolvedLanguage||this.languages[0],i=!!this.options&&this.options.fallbackLng,n=this.languages[this.languages.length-1];if("cimode"===s.toLowerCase())return!0;const o=(e,t)=>{const s=this.services.backendConnector.state[`${e}|${t}`];return-1===s||0===s||2===s};if(t.precheck){const e=t.precheck(this,o);if(void 0!==e)return e}return!!this.hasResourceBundle(s,e)||(!(this.services.backendConnector.backend&&(!this.options.resources||this.options.partialBundledLanguages))||!(!o(s,e)||i&&!o(n,e)))}loadNamespaces(e,t){const s=a();return this.options.ns?("string"==typeof e&&(e=[e]),e.forEach((e=>{this.options.ns.indexOf(e)<0&&this.options.ns.push(e)})),this.loadResources((e=>{s.resolve(),t&&t(e)})),s):(t&&t(),Promise.resolve())}loadLanguages(e,t){const s=a();"string"==typeof e&&(e=[e]);const i=this.options.preload||[],n=e.filter((e=>i.indexOf(e)<0&&this.services.languageUtils.isSupportedCode(e)));return n.length?(this.options.preload=i.concat(n),this.loadResources((e=>{s.resolve(),t&&t(e)})),s):(t&&t(),Promise.resolve())}dir(e){if(e||(e=this.resolvedLanguage||(this.languages&&this.languages.length>0?this.languages[0]:this.language)),!e)return"rtl";const t=this.services&&this.services.languageUtils||new C(H());return["ar","shu","sqr","ssh","xaa","yhd","yud","aao","abh","abv","acm","acq","acw","acx","acy","adf","ads","aeb","aec","afb","ajp","apc","apd","arb","arq","ars","ary","arz","auz","avl","ayh","ayl","ayn","ayp","bbz","pga","he","iw","ps","pbt","pbu","pst","prp","prd","ug","ur","ydd","yds","yih","ji","yi","hbo","men","xmn","fa","jpr","peo","pes","prs","dv","sam","ckb"].indexOf(t.getLanguagePartFromCode(e))>-1||e.toLowerCase().indexOf("-arab")>1?"rtl":"ltr"}static createInstance(){return new z(arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},arguments.length>1?arguments[1]:void 0)}cloneInstance(){let e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:J;const s=e.forkResourceStore;s&&delete e.forkResourceStore;const i={...this.options,...e,isClone:!0},n=new z(i);void 0===e.debug&&void 0===e.prefix||(n.logger=n.logger.clone(e));return["store","services","language"].forEach((e=>{n[e]=this[e]})),n.services={...this.services},n.services.utils={hasLoadedNamespace:n.hasLoadedNamespace.bind(n)},s&&(n.store=new O(this.store.data,i),n.services.resourceStore=n.store),n.translator=new P(n.services,i),n.translator.on("*",(function(e){for(var t=arguments.length,s=new Array(t>1?t-1:0),i=1;i<t;i++)s[i-1]=arguments[i];n.emit(e,...s)})),n.init(i,t),n.translator.options=i,n.translator.backendConnector.services.utils={hasLoadedNamespace:n.hasLoadedNamespace.bind(n)},n}toJSON(){return{options:this.options,store:this.store,language:this.language,languages:this.languages,resolvedLanguage:this.resolvedLanguage}}}const q=z.createInstance();q.createInstance=z.createInstance;q.createInstance,q.dir,q.init,q.loadResources,q.reloadResources,q.use,q.changeLanguage,q.getFixedT,q.t,q.exists,q.setDefaultNamespace,q.hasLoadedNamespace,q.loadNamespaces,q.loadLanguages}},function(e){var t;t=51250,e(e.s=t)}]); //# sourceMappingURL=i18n_init-9f062a0de30195f0d756.js.map //]]> </script> <script src="https://cdn.theconversation.com/static/tc/runtime-8563a1641acaeb567def.js"></script> <script type="text/javascript" data-vendor="c:smartocto-GJ7CA7CP"> var _ain = { access_level: "free", article_type: "analysis", authors: "Binghamton University, State University of New York", id: "2743", maincontent: ".content-body", postid: "240499", pubdate: "2024-11-13T13:25:18Z", reader_type: "anonymous", sections: "us>Health, us>Education", tags: "Dementia, Neuroscience, Brain training, Improved executive functioning, Games, Cognitive neuroscience, cognitive abilities, Dementia risk, Cognitive health, Executive functioning ", title: "Brain-training games remain unproven, but research shows what sorts of activities do benefit cognitive functioning", }; (function (d, s) { var sf = d.createElement(s); sf.type = 'text/javascript'; sf.async = true; sf.src = (('https:' == d.location.protocol) ? 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