منابع مشابه
On the binocular summation of chromatic contrast
The binocular summation of chromatic contrast was investigated under a variety of stimulus conditions. Binocular and monocular contrast detection thresholds were measured using 0.5 cpd Gabor patches. It was found that, using stimuli which contained combinations of chromatic and luminance contrast, binocular detection could take place independently in luminance-contrast- and chromatic-contrast-s...
متن کاملSpatial summation, contrast threshold, and aging.
lengths. Fur thermore , Schultz et al. , using artificial membranes with uniformly defined pores, found that for similar Stokes radius the globular proteins have larger reflection coefficients than those of the dextran fractions. Thus, in my opinion, it is erroneous to use the Stokes radius of dextran fractions to correlate the pore size of membranes. Miguel F. Refojo Eye Research Institute Bos...
متن کاملMultiple gain control processes in contrast–contrast phenomena
Spatial interactions among orientation-tuned gain control processes are presumed to mediate center-surround contrast-contrast phenomena. In this paper, we assess contributions of gain control processes that pool over orientation. We measured the apparent contrast of a luminance-modulated center disk embedded in various modulated surrounds. In all conditions, observers compared the apparent cont...
متن کاملBinocular summation of contrast remains intact in strabismic amblyopia.
PURPOSE Strabismic amblyopia is typically associated with several visual deficits, including loss of contrast sensitivity in the amblyopic eye and abnormal binocular vision. Binocular summation ratios (BSRs) are usually assessed by comparing contrast sensitivity for binocular stimuli (sens(BIN)) with that measured in the good eye alone (sens(GOOD)), giving BSR = sens(BIN)/sens(GOOD). This calcu...
متن کاملContrast-dependent and contrast-independent spatial summation of primary visual cortical neurons of the cat.
Recent studies have reported that the size of the classical receptive field (CRF) and the extent of spatial summation of V1 neurons depend on stimulus contrast. We reexamined these properties for 48 V1 neurons in the cat and found that all the cells had a constant CRF size, whereas their spatial summation properties can be contrast dependent (CD) or contrast independent (CID). Of the 29 CD cell...
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ژورنال
عنوان ژورنال: Journal of Vision
سال: 2010
ISSN: 1534-7362
DOI: 10.1167/5.8.454