Spatio-temporal requirements for binocular correlation in stereopsis
| Autor: | Martin J.M. Lankheet, Peter Lennie |
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| Rok vydání: | 1996 |
| Předmět: |
Male
Time Factors Vision Disparity genetic structures Optics Binocular disparity Modulation (music) Psychophysics Humans Binocular correlation Stereopsis Spatio-temporal integration Physics Depth Perception Vision Binocular business.industry Sensory Systems Ophthalmology Amplitude Pattern Recognition Visual Sensory Thresholds Spatial frequency business Binocular vision Noise (radio) |
| Zdroj: | Vision Research, 36(4), 527-538 Vision Research 36 (1996) 4 |
| ISSN: | 0042-6989 |
| Popis: | We measured sensitivity to binocular correlation in dynamic random-dot stereograms that defined moving sinusoidal gratings-in-depth. At a range of spatial frequencies and drift rates we established sensitivity by adding Gaussian distributed disparity noise to the modulation of disparity that defined a cyclopean grating, and finding the noise amplitude that rendered the grating just detectable. This permitted correlation thresholds to be measured at a range of suprathreshold disparity amplitudes. Spatial requirements for binocular correlation depend little on temporal frequency, and vice versa. This suggests that binocular correlation mechanisms can be characterized by independent spatial and temporal sensitivity functions. The temporal frequency function has a low pass characteristic. Sensitivity declines above about 1 c/sec, reaching its limit at 4–8 c/sec. The spatial characteristic depends greatly on the amplitude of disparity modulation, changing from band pass at low amplitude to low pass at high amplitude. The maximum resolvable spatial frequency is 4–6 c/deg, but declines sharply for relatively high amplitudes. The interaction between amplitude and spatial frequency cannot be explained by fixed high or low limits on detectable disparity gradients. |
| Databáze: | OpenAIRE |
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