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Inherent characteristics of visual stimulus systems and their effect on the visual evoked potential

C Barber

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The inherent stimulus characteristics of three common types of visual stimulus systems, based upon a slide projector, a television and a photic stimulator, were measured. The effect of these characteristics upon pattern visual evoked potentials (VEPS) elicited by the systems was also investigated. Considerable differences in both spatial and temporal luminance characteristics were found between the systems. The differences in spatial luminance properties produced no significant changes in the VEP waveform, but the temporal luminance properties of the television system, in particular, produced maleficent effects on the VEP. Methods of dealing with these problems and of overcoming some of the traditional disadvantages of a strobe stimulus are discussed.


PACS

87.80.-y Biophysical techniques (research methods)

87.19.R- Mechanical and electrical properties of tissues and organs

87.19.L- Neuroscience

42.66.Ew Physiology of eye; optic-nerve structure and function

Subjects

Instrumentation and measurement

Optics, quantum optics and lasers

Medical physics

Biological physics

Dates

Issue 2 (May 1981)



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