EVOKED-POTENTIALS OF SCHIZOPHRENICS IN SEVERAL SENSORY MODALITIES

  • 1 January 1977
    • journal article
    • research article
    • Vol. 12  (2) , 221-235
Abstract
EP [evoked potential] to left and right median nerve, visual (checkerboard flash) and auditory (click) stimuli were obtained for 14 monopolar scalp and 1 EOG [electroculogram] derivation in 32 schizophrenics and 16 nonpatients, matched for age and sex. Amplitude attenuation of EP events 100 ms poststimulus or later was shown in the patients'' EP of all modalities and in most lead locations. Attenuation of later EP events is apparently a general characteristic of schizophrenia. Comparisons of chronic paranoid and undifferentiated with other patient subtypes revealed a relatively specific correlate of the chronic subgroup, increased negativity of a negative somatosensory peak occurring 60 ms poststimulus (N60) at contralateral central leads.