Temporal summation in human vision: Simple reaction time measurements

Quantification of binaural loudness summation by measuring simple reaction time

When listening to sounds in a natural environment, different sound pressure levels reach the two ears. They are nevertheless combined to result in a single ’binaural’ loudness. This phenomenon is called binaural loudness summation. In the laboratory it can be carried to an extreme by stimulating one ear only (monaural presentation) or both ears (binaural or diotic presentation) using headphones...

Concentric orientation summation in human form vision

Psychophysical data demonstrate that orientation information in concentric, random-dot Glass patterns is summed linearly to extract a global form percept. Surprisingly, no such global pooling was found for Glass patterns with parallel structure. A simple neural model explains these results and agrees with recent V4 single unit physiology. As V4 provides the major input to IT, global concentric ...

Distribution of the human reaction time measurements.

Simple motor reaction time to, visual stimuli in dependence of stimulus intensity was measured and the histograms representing the distribution of reaction time were constructed. It was found that the reaction time distributions are positively skewed for all stimulus intensities used. The mean value, the standard deviation as well as the coefficient of skewness increases as the stimulus intensi...

Temporal and spatial summation in human vision at different background intensities.

Area summation in human vision at and above detection threshold

The initial image-processing stages of visual cortex are well suited to a local (patchwise) analysis of the viewed scene. But the world's structures extend over space as textures and surfaces, suggesting the need for spatial integration. Most models of contrast vision fall shy of this process because (i) the weak area summation at detection threshold is attributed to probability summation (PS) ...