Electroencephalogram (EEG) signal spectrum analyzer.

(a) Identification. An electroencephalogram (EEG) signal spectrum analyzer is a device used to display the frequency content or power spectral density of the electroencephalogram (EEG) signal. (b) Classification. Class I (general controls). [44 FR 51730, Sept. 4, 1979, as amended at 66 FR 46953, Sept. 10, 2001]