The principles that govern the evolution of brain structure are not well understood brain to body size clarification needed does not scale isometrically in a linear fashion but rather allometrically citation needed the brains and bodies of mammals do not scale linearly small bodied mammals have relatively large brains compared to their . Just how special is the human brain compared to other mammals the thing that stands out most is the size of the cerebral cortex the thick sheet of cells on the outside of the brain which is so expanded in humans that it has to be folded in on itself in order to fit inside the skull the cortex is the seat of higher brain functions the bit of the brain we see with hear with think with. Principles of brain evolution if we assume that biological intelligence in higher organisms is the product of processes of complex sensory information processing and mental faculties responsible for the planning execution and evaluation of intelligent behavior variations among species in intelligence must in principle be observable in the neural substrate. One year past darwins bicentennial yale has often been in the news for research on evolution down at the yale school of medicine however researchers are at the forefront of another type of evolutionary research the evolution of the human brain. Although the past does not predict future evolution a greater integration with technology and genetic engineering may catapult the human brain into the unknown
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