Mueller, Rolf and Goepfert, Edith and Leineweber, Marcus and Greenlee, Mark W. (2004) Effect of adaptation direction on the motion VEP and perceived speed of drifting gratings. VISION RESEARCH, 44 (20). pp. 2381-2392. ISSN 0042-6989, 1878-5646
Full text not available from this repository. (Request a copy)Abstract
The N200 amplitude of the motion-onset VEP evoked by a parafoveal grating of variable contrast (0.5-64%), constant speed (2degrees/ s), direction (horizontally rightward), and spatial frequency (2 cpd) was studied before and after adaptation to a stationary or drifting grating (1, 2, or 4degrees/s rightward or leftward). These results are compared to those for the pattern-appearance VER Psychophysical measurements were made simultaneously of the perceived speed. While iso-directional (rightward) adaptation leads to a mean amplitude reduction of 39%, the decrease after counter-directional adaptation has a size of 20%. The post-adaptation matches of perceived speed differ in dependence on the iso-directional adapting speed and decrease on average to 98%, 85%, and 69% of the pre-adapt perceived speed after 1, 2, and 4degrees/s adapting speeds, respectively. The perceived speed is moderately reduced (83% of the pre-adapt value) after counter-directional adaptation nearly independently of the adapting speed. A model of velocity processing is presented, which enables us to predict the trends of the experimental motion VEP and perceived speed data. (C) 2004 Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VISUAL AREA MT; TEMPORAL-FREQUENCY-SELECTIVITY; MACAQUE MONKEY; HUMAN-VISION; FUNCTIONAL-PROPERTIES; EVOKED-POTENTIALS; STIMULUS SPEED; CONTRAST; VELOCITY; NEURONS; Iso- and counter-directional adaptation; motion VEP; perceived speed; speed channels; stationary adaptation |
| 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: | 10 Aug 2021 05:21 |
| Last Modified: | 10 Aug 2021 05:21 |
| URI: | https://pred.uni-regensburg.de/id/eprint/38286 |
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