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Biomedical subjects

T H Harding

Publications and source records attributed to T H Harding.

3 recordsLinked to original sources
PubMed1979

Visual resolution and receptive field size: examination of two kinds of cat retinal ganglion cell.

Intraocular recordings from brisk-sustained and brisk-transient ganglion cells in the cat's retina revealed a systematic increase in center size and decrease in spatial cut-off frequency with increasing distance from the area centralis. At any one eccentricity sizes of the centers of sustained and transient cells did not overlap, and the variation in cut-off frequency for each class was constrained to about one-half octave.

Animals↗
PubMed1976

Monkey contrast threshold for aperiodic patterns.

A monkey's and a human subject's threshold responses were measured for single- and double-bar patterns of high spatial frequency. The observed values were compared to predicted values which were derived from each subject's contrast sensitivity function. A theoretical peak-to-trough threshold mechanism was assumed in the calculations. The threshold predictions, which are couched in the assumption that the spatial visual system is linear near its threshold, were found to be close to observed values. The results are interpreted to suggest that the monkey visual system analyzes spatial information in qualitatively and quantitatively similar ways to human, and that a linear theory may be used for analyses of primate vision.

Animals↗