Search PubMed⌕ Search

Biomedical subjects

R F Quick

Publications and source records attributed to R F Quick.

7 recordsLinked to original sources
PubMed1979

Hierarchical detection structures in vision.

A simple example shows that a hierarchy of visual cells can display different behavior for different stimuli. Stimuli with spatial characteristics similar to the receptive fields of a given level in the hierarchy can display summation behavior revealing the organization of that level; but other stimuli may show the organization of cells at other levels. On the other hand, such behavior may not actually occur in vision because the required nonlinearity between levels is very specific and may not be physiologically realistic.

Humans↗
PubMed1978

Spatial summation effects on two-component grating thresholds.

Some experimental studies of subthreshold summation between sinusoidal grating components have been interpreted as showing very narrow channel bandwidths in human visions. This paper discusses an alternative interpretation of these experiments based on consideration of probability-summation effects among spatially distributed detectors. We conclude that frequency-selective channels must still be hypothesized in order to fit the data, but the channel bandwidth may be much wider than earlier interpretations suggest.

Humans↗