";s:4:"text";s:3599:" This is a sperm whale compared with a human. Between species - no. It has been well documented that brain weight decreases with age starting in early adulthood. Social intelligence hypotheses posit that complex social interaction was responsible for the selection pressures that favored enhanced primate intelligence. When the mice were administered an increase of a gene named beta-catenin, their brains doubled in size, and they began to show more activity in the cerebral cortex [source: Cromie].The cerebral cortex, which regulates intelligence and language, is what sets humans apart from other species. Finally, raw brain volume (size) may not accurately reflect the number of brain neurons (which just may be a critical component of intelligence), or the size of any other functional unit of the brain. That may be so, however, new scientific studies across several animal species, including humans, are challenging the notion that brain size alone is a measure of intelligence. L’intelligence des cétacés désigne les capacités cognitives prêtées aux membres de l’ordre des cétacés, qui comprend les baleines, les marsouins, les cachalots et les dauphins.Cette intelligence est suggérée par la taille de leurs cerveaux, par leurs comportements individuels ou sociaux et par l'aisance de leurs capacités d'apprentissage. Still, size alone doesn't tell the whole story. So brain size is not irrelevant. And this is a human versus a dolphin. Absolute brain size clearly isn’t what really matters, otherwise people would be cognitive pygmies compared to whales and elephants. But does brain size correlate with intelligence if one compares modern people to one another? Brain Size and Intelligence. Of course, brain size is not 100 percent correlated with a person's intelligence, and other factors, including connections between brain cells and even a person's experiences, play roles.
The answer, thankfully, appears to be no. In the studies scientists have engaged in, intelligence is generally measured according to an intelligence quotient, or an IQ, test. The brain size to body size ratio is therefore more meaningful as a measure of “encephalization” of a species. Not too long ago, I was reading about the differences between the human brain and the brains of chimpanzees.
Factors relevant to the relationship between brain size and intelligence Age. It got me thinking about how we as humans somehow possess a greater level of intelligence than primates (at least, that we’ve observed) despite similar brain morphologies. July 17, 2019 July 17, 2019 ardonp. The relationship between brain size and intelligence, both amongst humans and between different species, has never been particularly well-defined. But brain size relative to body size doesn’t seem to be a particularly informative measure either. So an elephant may be no smarter than a rat, even though their brains are much larger. Researchers at Harvard Medical School isolated one of the brain-size genes by working with mice. One key component to studying the connection, if any, between brain size and intelligence is how we define “intelligence”. Absolute brain size is not a good measure of intelligence, because larger animals require larger brains just to physically operate their bodies. Research also shows that intelligence is not a function of how hard the brain works... but of how efficiently it works.