Aliasing in peripheral vision for counterphase gratings

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. Dejection was measurably higher than resolution acuity for all temporal frequencies at 90%. At 50% contrast, detection and resolution performance converged at similar to 30 Hz. For 10% contrast, detection and resolution performance remains largely P-cell mediated and sampling limited over a large range of contrasts and temporal frequencies. (C) 1996 Optical Society of America.