{"id":757306,"date":"2026-07-11T20:32:12","date_gmt":"2026-07-11T20:32:12","guid":{"rendered":"https:\/\/www.newsbeep.com\/us\/757306\/"},"modified":"2026-07-11T20:32:12","modified_gmt":"2026-07-11T20:32:12","slug":"how-the-rule-breaking-octopus-is-rewriting-the-evolution-of-intelligence","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/us\/757306\/","title":{"rendered":"How the Rule-Breaking Octopus Is Rewriting the Evolution of Intelligence"},"content":{"rendered":"

Humans have remarkably large brains for our bodies (no offense), but why?\u00a0<\/p>\n

One theory, the social brain hypothesis, says we owe our massive noggins in part to the evolutionary pressure exerted by the demands of large social groups. Because we needed to keep a running tally of friends and foes to navigate thorny hierarchies and shifting alliances, we had to have brains that were up to the task (which is why this theory is also known as the Machiavellian intelligence hypothesis).\u00a0<\/p>\n

In many animals, especially mammals, there does seem to be a correlation between social group size and brain size. But there\u2019s at least one big exception to this rule: cephalopods.\u00a0<\/p>\n

Cephalopods like octopuses have huge brains but aren\u2019t really known for their gregarious behavior. They tend to live solitary lives, mating without forming pair bonds and reproducing without parenting their young. In fact, their behavior can stray into the downright anti-social\u2014many species are territorial, aggressive, and cannibalistic. Still, they\u2019re incredibly intelligent. Octopuses use tools, solve problems, and even like to play.<\/p>\n

Read more: \u201cThe Octopus Teacher\u2019s Student<\/a>\u201d<\/p>\n

So if sociality can\u2019t explain big cephalopod brains, what can?\u00a0<\/p>\n

In a new paper published<\/a> in iScience, an international team of researchers proposed a new version of the cultural brain hypothesis. This hypothesis\u2014first advanced<\/a> by one of the authors of the current study\u2014states that big brains evolved to handle mountains of information that are learned both socially and asocially. In this latest research, the team focuses solely on the asocial pathway to brain evolution.\u00a0<\/p>\n

To test their asocial brain hypothesis, the team compiled data on cephalopod brain size as well as ecological, behavioral, and social factors from 79 cephalopod species. They found that several ecological factors seemed to correlate with big cephalopod brains, especially the complexity of their habitats. Cephalopods that lived on the ocean floor and in shallow pools\u2014where cleverness can be rewarded with calorie-rich prey\u2014tended to have larger brains. Sociality, on the other hand, showed no such correlation.\u00a0<\/p>\n

\u201cFor decades the main story of why brains got big has been a social one where bigger brains evolve to manage bigger, more complex groups,\u201d study author Michael Muthukrishna of the London School of Economics and Political Science said in a statement<\/a>. \u201cCephalopods reveal that there\u2019s another path to bigger brains.\u201d<\/p>\n

Let\u2019s hear it for the intelligent, moody loners of the sea. \"\"<\/p>\n

Enjoying Nautilus<\/a>? Subscribe to our free newsletter<\/a>.<\/p>\n

Lead image: Nokhoog \/ Adobe Stock<\/p>\n","protected":false},"excerpt":{"rendered":"Humans have remarkably large brains for our bodies (no offense), but why?\u00a0 One theory, the social brain hypothesis,…\n","protected":false},"author":2,"featured_media":757307,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[79],"class_list":["post-757306","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science","tag-science"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/757306","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/comments?post=757306"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/757306\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media\/757307"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media?parent=757306"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/categories?post=757306"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/tags?post=757306"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}