Fairhall, Scott L. and Schwarzbach, Jens and Lingnau, Angelika and Van Koningsbruggen, Martijn Gerbrand and Melcher, David (2017) Spatiotopic updating across saccades revealed by spatially-specific fMRI adaptation. NEUROIMAGE, 147. pp. 339-345. ISSN 1053-8119, 1095-9572
Full text not available from this repository. (Request a copy)Abstract
Brain representations of visual space are predominantly eye-centred (retinotopic) yet our experience of the world is largely world-centred (spatiotopic). A long-standing question is how the brain creates continuity between these reference frames across successive eye movements (saccades). Here we use functional magnetic resonance imaging (fMR.1) to address whether spatially specific repetition suppression (RS) is evident during trans-saccadic perception. We presented two successive Gabor patches (Si and S2) in either the upper or lower visual field, left or right of fixation. Spatial congruency was manipulated by having Si and S2 occur in the same or different upper/lower visual field. On half the trials, a saccade was cued between Si and S2, placing spatiotopic and retinotopic reference frames in opposition. Equivalent RS was observed in the posterior parietal cortex and frontal eye fields when Si-S2 were spatiotopically congruent, irrespective of whether retinotopic and spatiotopic coordinates were in accord or were placed in opposition by a saccade. Additionally the post-saccadic response to S2 demonstrated spatially-specific RS in retinotopic visual regions, with stronger RS in extrastriate than striate cortex. Collectively, these results are consistent with a robust trans-saccadic spatial updating mechanism for object position that directly influences even the earliest levels of visual processing.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LATERAL OCCIPITAL COMPLEX; EYE-MOVEMENTS; PARIETAL CORTEX; REPETITION SUPPRESSION; VISUAL-STABILITY; AREA MT; REPRESENTATION; PERCEPTION; MOTION; INTEGRATION; |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Psychiatrie und Psychotherapie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:01 |
| Last Modified: | 19 Feb 2019 10:09 |
| URI: | https://pred.uni-regensburg.de/id/eprint/388 |
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