Accession Number:

ADA125681

Title:

Brain Responses and Information Processing III. Hemispheric Asymmetry in Event Related Potentials and Performance during Discrimination of Line Orientation and Velocity of Motion.

Descriptive Note:

Annual rept. no. 3, 1 Oct 81-30 Sep 82,

Corporate Author:

BERNARD M BARUCH COLL NEW YORK

Personal Author(s):

Report Date:

1982-11-30

Pagination or Media Count:

73.0

Abstract:

The research completed over the last 12 months has included studies concerned with evoked brain potentials and performance measures during perceptual discriminations. Experiment I examined the event related potential ERP during discriminations of line orientation in three visual fields. The main finding concerning discrimination performance confirmed that right hemisphere discriminations LVF would be better than left, RVF but only for males. Another important finding was that, while discrimination task invoked an expected P3 response, significantly larger P3 amplitudes were associated with the line orientation stimulus i.e., 55 deg line requiring a YES response. A follow-up study was briefly described in which subjects will be required to say YES to the 50 deg line and NO to the 55 deg line, with the expectation that the P3 amplitude advantage would switch to the 50 deg line. Experiment II concerned the discrimination of motion velocities and the relation of this process to ERPs. Performance data indicated that left hemisphere discriminations RVF were superior to right LVF. A separate analysis of male-female performance indicated that females contributed to this effect more than males. Finally, laterality effects were suggested for the P3 component since right hemisphere derived amplitudes for P3 were larger with the faster velocity.

Subject Categories:

  • Psychology
  • Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE