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Discrimination of spatial phase in central and peripheral vision
M C Morrone1, D C Burr, D Spinelli
1Department of Psychology, University of Western Australia, Nedlands.
Vision Research
|January 1, 1989
Summary
Peripheral vision phase sensitivity is higher than previously thought, matching central vision after size scaling. This suggests phase discrimination relies on filter responses, not positional evaluation, in visual perception.
Area of Science:
- Vision science
- Perceptual psychology
Background:
- Previous studies indicated lower phase sensitivity in peripheral vision.
- The role of relative phase in visual perception remains an active area of research.
Purpose of the Study:
- To investigate peripheral vision phase sensitivity using complex stimuli.
- To compare peripheral and central vision phase sensitivity.
- To explore the mechanisms underlying phase discrimination.
Main Methods:
- Measured sensitivity to relative phase using stimuli with 256 harmonics.
- Used amplitude-smoothed stimuli across various spatial frequencies and positions.
- Scaled peripheral sensitivity for size to compare with central sensitivity.
Main Results:
- Peripheral phase sensitivity was significantly higher than previously reported.
- Sensitivity was independent of stimulus average phase and second-order statistics.
- Size-scaled peripheral sensitivity matched central sensitivity.
- The scaling factor was consistent with contrast sensitivity and grating acuity.
Conclusions:
- Phase sensitivity decreases with eccentricity at a rate similar to contrast sensitivity and grating acuity.
- Phase discrimination appears mediated by quasi-linear filter response amplitude, not positional evaluation.
- Peripheral phase sensitivity deficits may stem from positional uncertainty, not inherent phase discrimination limitations.