1987 Volume 29 Issue 1 Pages 10-16
Prolonged viewing of high contrast grating is known to cause an apparent shift in subsequent spatial frequency perception. This experiment tested the effect of compound adapting gratings composed of the fundamental and the third harmonic which were in phase or 180° out of phase. Six well trained subjects served the experiment. Perceptual frequency shift was found to occur as predicted but no phase effect was found. This was confirmed by multiple correlation solutions where the compound effects, the target variable, were explained by independent contributions of the effect of componental sinusoidals. It was concluded that the change in the sensitivity of some spatial-frequency-tuned mechanisms due to an adaptation to stimulus frequency caused the perceived spatial frequency shift and the hypothetical mechanisms are mutually independent with respect to frequency.