منابع مشابه
Motion perception at scotopic light levels.
Although the spatial and temporal properties of rod-mediated vision have been extensively characterized, little is known about scotopic motion perception. To provide such information, we determined thresholds for the detection and identification of the direction of motion of sinusoidal grating patches moving at speeds from 1 to 32 deg/s, under scotopic light levels, in four different types of o...
متن کاملMotion processing at low light levels: Differential effects on the perception of specific motion types.
While many aspects of human vision at low light levels have been studied in great detail, motion perception has rarely been investigated so far. Here we address differential effects of light level on the perception of coherent motion, heading from radial flow, and biological motion. We determined detection thresholds under photopic, mesopic, and scotopic conditions. Results indicate that the pe...
متن کاملMotion detection from photopic to low scotopic luminance levels
In this study we quantify the influence of adaptation luminance on the threshold for direction-detection in coherently moving random-pixel arrays (RPAs). Square RPAs of a constant rms-contrast (35%) were used and we determined their 'critical' or threshold-width Wc. Mean retinal illuminances were varied in 13 steps of 0.5 log unit from the low photopic range (screen luminance 0.3 cd/m2) down to...
متن کاملLevels of motion perception
I shall present some new, or newish, illusions to show that motion signals in the early parts of the visual system are profoundly altered by stimulus luminance and contrast. I shall show that contrast affects: 1. Motion strength in Time till breakdown 2. Motion strength in Crossover motion 3. Speed in The Footsteps illusion 4. Direction in The Plaid-motion illusion 5. Direction: Split dots I sh...
متن کاملObject perception by visually impaired people at different light levels
We investigated the relationship between the illumination level and the ability of visually impaired subjects to detect and recognize objects in a realistic visual environment. Subjects often continued to show substantial improvement at light levels where normal subjects have reached maximum performance. Integrated contrast sensitivity, a summary measure for the contrast sensitivity function, w...
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ژورنال
عنوان ژورنال: Journal of the Optical Society of America A
سال: 2000
ISSN: 1084-7529,1520-8532
DOI: 10.1364/josaa.17.001505