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The effect of contrast on the visual response of lagged and nonlagged cells in the cat lateral geniculate nucleus

Published online by Cambridge University Press:  02 June 2009

E. Hartveit  and
P. Heggelund
E. Hartveit
Affiliation:
Department of Neurophysiology, University of Oslo, N-0317 Oslo, Norway
P. Heggelund
Affiliation:
Department of Neurophysiology, University of Oslo, N-0317 Oslo, Norway
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Abstract

The response vs. contrast characteristics of different cell classes in the dorsal lateral geniculate nucleus (LGN) were compared. The luminance of a stationary flashing light spot was varied stepwise while the background luminance was constant. Lagged X cells had lower slope of the response vs. contrast curve (contrast gain), and they reached the midpoint of the response range over which the cells' response varied (dynamic response range) at higher contrasts than nonlagged X cells. These results indicated that nonlagged cells are well suited for detection of small contrasts, whereas lagged cells may discriminate between contrasts over a larger range. The contrast gain and the contrast corresponding to the midpoint of the dynamic response range were similar for X and Y cells. The latency to onset and to half-rise of the visual response decreased with increasing contrast, most pronounced for lagged cells. Even at the highest contrasts, the latency of lagged cells remained longer than for nonlagged cells. For many lagged cells, the latency to half-fall decreased with increasing contrast. It is shown that the differences in the response vs. contrast characteristics between lagged and nonlagged X cells in the cat are similar to the differences between the parvocellular and magnocellular neurones in the monkey.

Keywords

Contrast gainLagged cellsLateral geniculate nucleusNonlagged cellsSingle unit
Type
Research Articles
Information
Visual Neuroscience , Volume 9 , Issue 5 , November 1992 , pp. 515 - 525
Copyright
Copyright © Cambridge University Press 1992

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