A perceptual phenomenon and its neurophysiological correlate.
A square-wave grating from which the fundamental harmonic has been subtracted (missing fundamental grating) when viewed from a suitable distance appears similar to another grating of periodicity three times higher. The neurons of the visual cortex of the cat, in a given range of spatial frequencies characteristic of each cell, give similar responses to the two gratings.
D000818:Animals; D002415:Cats; D005556:Form Perception / Q000502:physiology; D009474:Neurons / Q000502:physiology; D009903:Optical Illusions / Q000502:physiology; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics; D013028:Space Perception / Q000502:physiology; D014793:Visual Cortex / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*