Effect of adaptation level on maintained firing and sensitivity in receptive field center of X and Y cells |
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Authors: | J G Pollack R W Winters |
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Institution: | (1) Psychology Department, University of Miami, P. O. Box 248185, 33124 Coral Gables, Florida, USA |
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Abstract: | Summary Maintained firing rates of X cells and Y cells were compared at 6 adaptation levels (AL) between –2.71 log cd/m2 and 2.28 log cd/m2 (10 mm2 pupil size). X cell maintained firing was higher at all ALs and was statistically different at medium and high ones. Changes in AL had nearly identical effects upon X and Y cell suprathreshold sensitivity to a flashing spot in the center of their receptive fields; the Weber function had a slope of 0.744 for Y cells and 0.743 for X cells. These values are not statistically different.This research is supported by Public Health Service grant no. EY 00701. |
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