Abstract Telemetric EEG recordings of eight healthy persons were obtained during rest and during performance of 4 different tasks with eyes closed and of 5 tasks with eyes open. Automatic analysis of temporo-occipital and fronto-central EEG (period-amplitude analysis) yielded the following results: 1. 1. When the eyes were open, temporo-occipital and fronto-central alpha activity were in all cases less than when the eyes were closed (on average approx. 50%). 2. 2. Fronto-central “alpha” activity, both with eyes open and closed, was decreased during performance. 3. 3. Performance produced a significant trend toward intermediate degrees of temporo-occipital alpha activity. With eyes closed a decrease in the number of alpha waves (desynchronization) and with eyes open an increase (synchronization) was observed. 4. 4. The increase in synchronization with eyes open appeared largely independent of weather visual components were directly involved in the task.
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