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Investigative Ophthalmology & Visual Science, Vol 22, 675-680, Copyright © 1982 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Visual-evoked responses elicited by the onset and offset of sinusoidal gratings: latency, waveform, and topographic characteristics

DM Parker, EA Salzen and JR Lishman

Transient evoked potentials (VERs) elicited by the onset and offset of sinusoidal gratings have been investigated. Results indicated that an increase in amplitude and a decrease in latency characteristics of VER occur as monotonic functions of increasing contrast. The latencies were shorter for low than for medium spatial frequency gratings up to contrasts of 0.51. Previous reports of the latency of the VER increasing as a monotonic function of increasing spatial frequency are confirmed. Topographic studies of the scalp distribution of VERs indicated that the site of maximal response were similar for low and medium spatial frequencies and that potentials elicited by stimulus offset had a similar distribution to the early onset response. These results indicate that the same cortical region may be responsible for generating these potentials despite their different latency and trigger features. Additional data are presented to illustrate the likely effects of differential recording on the waveform of the VER.


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H. Tabuchi, T. Yokoyama, M. Shimogawara, K. Shiraki, E. Nagasaka, and T. Miki
Study of the Visual Evoked Magnetic Field with the M-Sequence Technique
Invest. Ophthalmol. Vis. Sci., June 1, 2002; 43(6): 2045 - 2054.
[Abstract] [Full Text] [PDF]


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