Abstract
The perceived contrast of a central stimulus can be decreased (surround suppression) or increased (surround facilitation) by the presence of surround stimuli. In this report we examined center-surround interactions in foveal and peripheral vision using contrast-matching tasks. We found that: (1) surround suppression became markedly stronger as the center-surround stimulus was moved toward the periphery; (2) surround facilitation diminished in the periphery; and (3) the suppression in the periphery was less orientation- and frequency-specific than that in the fovea, so that significant suppression was induced even when the central and surround gratings had very different orientations and spatial frequencies. The different center-surround interactions in the fovea and periphery can not be accounted for by cortical magnification, suggesting that center-surround interactions in the fovea and periphery are incommensurable and play different functional roles in human image processing.
Original language | English (US) |
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Pages (from-to) | 3065-3072 |
Number of pages | 8 |
Journal | Vision research |
Volume | 40 |
Issue number | 22 |
DOIs | |
State | Published - Oct 2000 |
Keywords
- Facilitation
- Lateral interactions
- Masking
- Peripheral vision
- Suppression
ASJC Scopus subject areas
- Ophthalmology
- Sensory Systems