Evoked Cortical Potentials and Information Processing.
Abstract
The computer system has allowed us to present a wide variety of visual stimuli, at very fast rates--from 50 microseconds to one second, in 50 microsecond increments--at various stimulus intensities. It has enabled us to study sequential blanking, phenomenon in which up to one-half of ordinarily visible inputs are not perceived because of display input order and rate. We measured visual evoked potentials (VEPs) under conditions of sequential blanking and found that although subjects did not perceive the blanked stimuli, they did respond to them physiologically as indicated by the VEPs. It was also found that sequential blanking could be overcome by increasing the intensity of normally blanked stimuli. It was found that proprioceptive stimulation (induced muscle tension) enhanced the amplitude of cortical response to flashes of light in a number of male subjects. This was found to occur in a series of experimental sessions extending over several weeks. Another experiment on the possible cortical interaction produced by simultaneously presented auditory and visual stimuli indicated that sensory interaction does take place since the cortical evoked potentials differed, both in amplitude or auditory stimuli were presented alone.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1979
- Accession Number
- ADA072472
Entities
People
- J. L. Andreassi
Organizations
- Baruch College