Interarea electroencephalographic phase relationships following sensory and ideational stimuli.

Moment-by-moment changes in the phase or relative timing of electroencephalographic (EEG) patterns in different brain areas show great lability and psychological responsiveness, and are studied as possible correlates of peripheral psychophysiological reaction. Relative leading, lagging, and in-phase relationships between EEGs of different brain areas are automatically recorded, and stimuli classed as simple sensory, indifferent-ideational, disturbing-ideational, and adaption routines are employed. EEG leading in anterior and central brain areas is found to characterize conditions of arousal. Rapid diphasic reversals of interarea EEG phase relationship during mental activity is possibly symptomatic of interaction between brain areas. Effects of familiarity and adaptation are evaluated.

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