Scientist Roger Seymour's method, relies on the assumption that cognitive ability can be assessed, not simply by brain size, but by the energy that is required for the brain to perform its cognitive functions -- or the brain's metabolic rate.
Researchers using a new method to evaluate the cognitive abilities of species stumbled across a surprising finding: Our evolutionary ancestor, Australopithecus, may have been less intelligent than modern-day great apes.
It has long been theorized that a bigger brain means greater cognitive ability, which is generally defined as an individual's overall mental capability and how they reason, solve problems, plan, think in the abstract, and learn from life experiences.If this were the case, humans would have superior cognitive power, followed in the distance by Australopithecines and gorillas, with chimpanzees and orangutans bringing up the rear of the great ape species.
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