منابع مشابه
Depth-dependent contrast gain-control
Contrast adaptation that was limited to a small region of the peripheral retina was induced as observers viewed a multiple depth-plane textured surface. The small region undergoing contrast adaptation was present only in one depth-plane to determine whether contrast gain-control is depth-dependent. After adaptation, observers performed a contrast-matching task in both the adapted and a non-adap...
متن کاملContrast gain control is drift-rate dependent: an informational analysis.
Neurons in the visual cortex code relative changes in illumination (contrast) and adapt their sensitivities to the visual scene by centering the steepest regions of their sigmoidal contrast response functions (CRFs: spike rate as a function of contrast) on the prevailing contrast. The influence of this contrast gain control has not been reported at nonoptimal drift rates. We calculated the Fish...
متن کاملSimulation of Retinal Contrast Gain Control Mechanisms
I present a simulation of contrast gain control mechanisms operating among transient M cells in the monkey s retina in order to investigate the spatial consequences of this interaction The simulation stages include a realistic viewing model non linear receptor model linear spatial ltering and a saturating output function Contrast gain control is introduced by pooling recti ed signals from on an...
متن کاملSpatial pooling of contrast in contrast gain control.
We report psychophysical measurements of spatial pooling functions for contrast gain control. We use a nulling technique to measure the dependence of contrast induction on the spatial frequency of a sinusoidal contrast modulation. This dependence on spatial frequency, when transformed, provides the profile of a spatial pooling function. The measured profiles are fitted well by Gaussians. We con...
متن کاملThe statistical computation underlying contrast gain control.
In the early visual system, a contrast gain control mechanism sets the gain of responses based on the locally prevalent contrast. The measure of contrast used by this adaptation mechanism is commonly assumed to be the standard deviation of light intensities relative to the mean (root-mean-square contrast). A number of alternatives, however, are possible. For example, the measure of contrast mig...
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ژورنال
عنوان ژورنال: Vision Research
سال: 2004
ISSN: 0042-6989
DOI: 10.1016/j.visres.2003.11.005