Abstract
Responses of 53 cells to stimuli varying in purity were recorded from the macaque LGN. The type of response (either excitation or inhibition) of any given cell was determined by the stimulus wavelength while the response magnitude was determined by stimulus purity. Pure stimuli (highly saturated) resulted in large response magnitudes, whether excitation or inhibition. The purity increment required to change the response rate of a unit by an arbitrary response criterion was determined for all cells. The reciprocal of the purity increment plotted against wavelength yielded a purity discrimination function in good agreement with that obtained behaviorally from macaque monkeys.
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