Brain Responses and Information Processing. II. Investigations of Hemispheric Asymmetry in Event Related Potentials during Perception of Motion and Line Length.
Abstract
Experiment I examines the visual event-related potentials (ERP) as a function of moving and stationary stimuli presented in three visual fields. The main finding was that, for female subjects, right hemispheric derived ERPs were larger in amplitude than left hemisphere recordings for moving stimuli presented centrally. Males showed no hemispheric amplitude differences. However, for male subjects the left hemisphere ERP latencies to motion were longer than those recorded from over the right hemisphere with central visual field (CVF) presentations. Experiment II deals with the problems of undetected strabismic persons in evoked potential research. Approximately 14% of the individuals screened for our research (15 of 109) suffered from strabismus (eye muscle imbalance). These individuals have difficulty in fixating a central point in their visual field with both eyes. A comparison of results for six strabismic and six normal eye balance subjects revealed that strabismics do not show the expected latency and amplitude advantages of contralateral hemispheric stimulation. The final study concerns the discrimination of line length in three visual fields and the relation of this process to ERPs. Our performance data included no difference in accuracy of discriminations in left visual field (right hemisphere) and right visual field (left hemisphere).
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1981
- Accession Number
- ADA111176
Entities
People
- John L. Andreassi
- N. M. Juszczak
Organizations
- Baruch College