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Biomedical subjects

R H Cormack

Publications and source records attributed to R H Cormack.

7 recordsLinked to original sources
PubMed1980

Do the two eyes constitute separate visual channels?

A two-interval forced-choice procedure was used to study monocular detection of a briefly presented low-contrast sine-wave grating pattern. Uncertainty about which eye was stimulated degraded detection performance for stereo-blind observers but not for normal ones. These results relate to selective monocular suppression, stereopsis, and other forms of binocular interaction and suggest the level at which inputs to the two eyes are combined neurally.

Form Perception↗
PubMed1979

Psychophysical evidence for a monocular visual cortex in stereoblind humans.

Human observers who lack stereopsis reliably make eye-of-origin discriminations for grating patterns under conditions that render the performance of normal observers unreliable. This lends support to the view that stereoblind individuals possess proportions of monocular and binocular cortical cells similar to those of cats and monkeys deprived of early binocular visual experience.

Depth Perception↗
PubMed1973

Haptic illusion: apparent elongation of a disk rotated between the fingers.

A disk (coin) turned end over end between thumb and forefinger feels longer to the turning hand. The illusion grows rapidly for 30 seconds but does not become asymptotic within 60 seconds. The illusion increases with coin size and turning rate, and is independent of holding pressure. It appears to involve illusory mechanisms in both hands.

Figural Aftereffect↗