Temporal and spatial effects in luminance discrimination
نویسندگان
چکیده
منابع مشابه
Chromaticity discrimination: effects of luminance contrast and spatial frequency.
We examined the effects of luminance contrast and spatial frequency on chromaticity discrimination of grating bars. Alternate bars of gratings were filled with light of a standard wavelength and light that could be varied in wavelength. The observer set the variable bars to match the standard bars in hue. Discrimination, as measured by the standard deviation of the matches, decreased as spatial...
متن کاملOrientation and spatial-frequency discrimination for luminance and chromatic gratings.
We have examined the accuracy of orientation and spatial-frequency discrimination for sine-wave gratings that vary in either luminance or color. The equiluminant chromatic gratings were modulated along either a tritanopic confusion axis (so that they were detectable on the basis of activity in only the short-wavelength-sensitive cones) or an axis of constant short-wavelength-sensitive cone exci...
متن کاملEffects of contrast and temporal frequency on orientation discrimination for luminance and isoluminant stimuli
We compared the mechanisms responsible for orientation discrimination of stimuli defined by luminance and red/green isoluminant contrast. A four-alternative forced-choice (4-AFC) paradigm was used to determine thresholds for discriminating 1 cpd sinewave gratings differing in orientation, contrast, or both. When measuring orientation thresholds as a function of stimulus contrast, we found a dec...
متن کاملEffects of Hand Proximity and Movement Direction in Spatial and Temporal Gap Discrimination
Previous research on the interplay between static manual postures and visual attention revealed enhanced visual selection near the hands (near-hand effect). During active movements there is also superior visual performance when moving toward compared to away from the stimulus (direction effect). The "modulated visual pathways" hypothesis argues that differential involvement of magno- and parvoc...
متن کاملPrivacy Spatial and Temporal Distances in Nomadic Settelments
Human always in interaction with their social environment, have consider some degree of privacy with different purposes, for themselves, the people around them and carry out their activities. Creating privacy depends on two elements; subjective meanings that ruling the creation of privacy, and the second sentence are person available facilities. Privacy is not seen, heard, smelled and availabil...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Perception & Psychophysics
سال: 1968
ISSN: 0031-5117,1532-5962
DOI: 10.3758/bf03210457