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An electroencephalogram (EEG) allows for the measurement of the general neural activity of the cerebral cortex. Minor voltage fluctuations are measured between selected pairs of electrodes. The frequency of change between pairs of electrodes gives the resulting pattern of the EEG. Patterns are termed by their frequency range and each range is given a Greek letter designation. Alpha waves are about 8-13 Hz.

Alpha waves occur when a person is

A

alert.

B

attentive.

C

resting quietly.

D

sleeping soundly.

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