Because of artifact, a segment begin- ning 5 seconds later was chosen for subject 3. Impressionistic interpre- tation of the EEGs by one of the authors disclosed no appreciable or con- sistent changes in the E E G during masturbation and ejaculation. Heath described intracranial recordings of spike and slow wave activity from the "septal region" in two patients during sexu- al intercourse and orgasm. This activity was confined entirely to the bilater- al frontal sites F3 and F4 and was interpreted by the electroencephalographer as probably of muscular origin. The signal was amplified using a bandpass of 0.
While acknowledging the difficutties of obtaining artifact-free record- ings, these investigators agreed in emphasizing that the EEG may provide an objective measure of sexual arousal and orgasm.
EEG during masturbation and ejaculation.
These results are consistent with autonomie changes that have been reported to accompany sexual responses in a number of studies e. These reports continue to be cited Niedermeyer,p. Channel 15 is the electro-oculogram recorded from an electrode at the outer canthus of the left eye. Because different EEG montages were used in the four subjects, the prefrontal data Fpl and Fp2 from subjects 1 and 2 were com- bined with frontal data F3 and F4 from subjects 3 and 4 to serve as cor- responding levels of the electrode variable. The signal was integrated and rectified using a Grass 7P3 preamplifier with a time constant of 0. First artifact-free segment at the beginning of the baseline period PRE Impressionistic interpre- tation of the EEGs by one of the authors disclosed no appreciable or con- sistent changes in the E E G during masturbation and ejaculation.