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| Postsaccadic target blanking prevents saccadic suppression of image displacement |
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| Author(s): Deubel H, Schneider WX, Bridgeman B |
| Source: VISION RESEARCH Volume: 36 Issue: 7 Pages: 985-996 Published: APR 1996 |
| Times Cited: 82 References: 41 |
| Abstract: Displacement of a visual target during a saccadic eye movement is normally detected only at a high threshold, implying that high-quality information about target position is not stored in the nervous system across the saccade. We show that blanking the target for 50-300 msec after a saccade restores sensitivity to the displacement. With blanking, subjects reliably detect displacements as small as 0.33 deg across 6 deg eye movements, with correspondingly steep psychophysical functions. Performance with blanking in a fixation control is inferior, evidence for a saccadic enhancement of sensitivity to image displacement. If blanking is delayed so that the target is visible immediately after the saccade in its displaced position, performance declines to non-blanking levels. Blanking the target before the saccade, and restoring it during the saccade, yields a similar but weaker effect. We interpret these results with a model in which the visual system searches for the postsaccadic goal target within a restricted spatiotemporal window. If it is mt found,:the assumption of stationarity of the world is broken-and the system makes use of other information such as extraretinal signals for calibrating location. |
| Document Type: Article |
| Language: English |
| Reprint Address: Deubel, H (reprint author), MAX PLANCK INST PSYCHOL RES, LEOPOLDSTR 24, D-80802 MUNICH, GERMANY |
Addresses:
1. UNIV MUNICH, D-80802 MUNICH, GERMANY
2. UNIV CALIF SANTA CRUZ, PROGRAM EXPTL PSYCHOL, SANTA CRUZ, CA 95064 USA |
| Publisher: PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB |
| Subject Category: Neurosciences; Ophthalmology |
| IDS Number: UC234 |
| ISSN: 0042-6989 |
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