1975 volume 4(3) pages 331 – 335
doi:10.1068/p040331

Cite as:
Tolhurst D J, 1975, "Illusory shifts in spatial frequency caused by temporal modulation" Perception 4(3) 331 – 335
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Illusory shifts in spatial frequency caused by temporal modulation

David J Tolhurst

Received 8 May 1975

Abstract. It is known that temporal modulation of a sinusoidal grating of low spatial frequency causes an increase in the apparent spatial frequency of the grating. A possible explanation for the illusion is proposed. Temporal modulation would favour channels which respond only transiently to prolonged presentation of a grating. These channels may be the human analogues of Y-cells found in the cat retina. Y-cells respond nonlinearly to gratings, and the nonlinearity may be the root of the apparent spatial-frequency illusions.

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