Abstract

The study measured spatial detection and resolution acuity thresholds at 30 deg eccentricity for sinusoidal gratings of different contrast (10–90%) that phase reverse at different temporal frequencies (0–40 Hz). Resolution performance at any contrast displayed little deterioration with increasing temporal frequency up to 10 Hz, after which it declined smoothly, indicating no definable break where performance switched from being P-cell to M-cell mediated. Detection was measurably higher than resolution acuity for all temporal frequencies at 90%. At 50% contrast, detection and resolution performance converged at ∼30 Hz. For 10% contrast, detection and resolution performance were the same at all temporal frequencies. These results indicate that resolution performance remains largely P-cell mediated and sampling limited over a large range of contrasts and temporal frequencies.

© 1996 Optical Society of America

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