Lin, Yih-Shiuan and Chen, Chien-Chung and Greenlee, Mark W. (2022) Neural correlates of lateral modulation and perceptual filling-in in center-surround radial sinusoidal gratings: an fMRI study. SCIENTIFIC REPORTS, 12 (1): 16143. ISSN 2045-2322
Full text not available from this repository. (Request a copy)Abstract
We investigated lateral modulation effects with functional magnetic resonance imaging. We presented radial sinusoidal gratings in random sequence: a scotoma grating with two arc-shaped blank regions (scotomata) in the periphery, one in the left and one in the right visual field, a center grating containing pattern only in the scotoma regions, and a full-field grating where the pattern occupied the whole screen. On each trial, one of the three gratings flickered in counterphase for 10 s, followed by a blank period. Observers were instructed to perform a fixation task and report whether filling-in was experienced during the scotoma condition. The results showed that the blood-oxygen-level-dependent signal was reduced in areas corresponding to the scotoma regions in the full-field compared to the center condition in V1 to V3 areas, indicating a lateral inhibition effect when the surround was added to the center pattern. The univariate analysis results showed no difference between the filling-in and no-filling-in trials. However, multivariate pattern analysis results showed that classifiers trained on activation pattern in V1 to V3 could differentiate between filling-in and no-filling-in trials, suggesting that the neural activation pattern in visual cortex correlated with the subjective percept.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SURFACE-BASED ANALYSIS; PRIMARY VISUAL-CORTEX; ARTIFICIAL SCOTOMA; MACAQUE V1; CONTRAST; COLOR; SUPPRESSION; RESPONSES; STIMULI; ORGANIZATION |
| Subjects: | 100 Philosophy & psychology > 150 Psychology |
| Divisions: | Human Sciences > Institut für Psychologie > Lehrstuhl für Psychologie I (Allgemeine Psychologie I und Methodenlehre) - Prof. Dr. Mark W. Greenlee |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Feb 2024 05:46 |
| Last Modified: | 08 Feb 2024 05:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/57323 |
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