Theory of Flicker and Transient Responses,* II Counterphase Gratings

The model derived in the preceding paper is applied to new sine-wave flicker data, obtained with 7° circular, uniform-field and counterphase-grating targets, at four adaptation levels ranging from 1.67 to 1670 td. The data from all eight conditions are well fitted by varying two parameters associated with neural-inhibition processes; the major effect of changing the spatial pattern is on the number of neural units involved. But even when lateral inhibition is minimized, low-frequency feedback still dominates the transient responses of the model. These results can be interpreted in terms of spatial and temporal filtering in the outer and inner plexiform layers of the retina.