Abstract
Awake scalp EEGs were recorded from 170 restrained animals, including tree shrews, prosimians, New World simians, and Old World simians. Percent scores were determined for alpha and beta range frequencies and the alpha-beta ratios were compared. It was determined that: (a) the tree shrew has a highly variable and disorganized EEG with no particular frequency range consistently represented, whereas the true monkeys show relatively consistent and stable frequency patterns; (b) high alpha activity appears to be related to level of evolutionary development; and (c) low alpha or high beta activity is not related to phylogeny but appears to be related to life style.
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