The Dragons of Eden: Speculations on the Evolution of Human IntelligenceThe well-known astronomer and astrobiologist surveys current knowledge of the development of intelligence on Earth in various forms of life and explains his persuasion that intelligence must have developed along similar lines throughout the universe. |
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Dragons of Eden: Speculations on the Evolution of Human Intelligence Carl Sagan Limited preview - 2012 |
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ability able activity American analytical ancestors animals apes behavior bits body mass brain function brain mass brain to body brain volume called cells cerebral cortex cerebral hemispheres chimpanzees cognitive complex components connection corpus callosum cosmic cubic centimeters cultural described dinosaurs dragons dream Earth electrical emotional endocranial evidence evolution evolutionary evolved example experiments forebrain fossil frontal lobes genetic gestural language gracile Australopithecines hand hemi hindbrain Homo erectus Homo habilis human brain impairment intelligence intuitive invention learning least left hemisphere lesions limbic system mammalian mammals memory ment midbrain million years ago molecules monkeys mutation natural selection neocortex neocortical neural neurons olfactory organisms parietal lobe patient patterns perhaps predators primates programs proteins R-complex ratio of brain recent remarkable reptiles reptilian right hemisphere ritual seems sense sexual significant sleep smell species split-brain survival synapses temporal lobe tion triune brain verbal Washoe word