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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Remmers, Angelique Dits, Joyce Van Der Steen, Johannes Pel, Johan J. M. |
| Description | Country affiliation: Netherlands Author Affiliation: Dits J ( Department of Neuroscience, Erasmus University Medical Center, Rotterdam, The Netherlands.) |
| Abstract | PURPOSE: Visual orientation toward remembered or visible visual targets requires binocular gaze shifts that are accurate in direction (version) and ocular distance (vergence). We determined the accuracy of combined version and vergence movements and the contribution of the abducting and adducting eye during gaze shifts toward memorized and visual targets in three-dimensional space. METHODS: Subjects fixated either a 'far' (94 cm) or 'near' (31 cm) fixation light-emitting diode (LED) placed in front of the left eye. Next, in the memory-guided experiment, a target LED was lit for 80 ms (13 cm to the left or right and at 45 cm viewing distance). Subjects were instructed to make a saccade to the (remembered) target LED location. In the visually guided experiment, the target LED remained illuminated during the task. In both conditions, gaze shifts consisted of version and vergence movements. RESULTS: Visually guided gaze shifts had both a fast intrasaccadic and a slow postsaccadic vergence component and were most accurate. During memory-guided gaze shifts, the abducting eye was more accurate than the adducting eye. Distance correction was achieved by slow postsaccadic vergence of the adducting eye. Memory-guided gaze shifts that required convergence lacked an intrasaccadic vergence component and were less accurate compared to memory-guided gaze shifts that required divergence. CONCLUSIONS: Visually guided binocular gaze shifts are faster and more accurate than memory-guided binocular gaze shifts. During memory-guided gaze shifts, the abducting eye has a leading role, and an intrasaccadic vergence enhancement during convergence is reduced. |
| ISSN | 01460404 |
| e-ISSN | 15525783 |
| Journal | Investigative Opthalmology & Visual Science |
| Issue Number | 3 |
| Volume Number | 54 |
| Language | English |
| Publisher | Association for Research in Vision and Ophthalmology |
| Publisher Date | 2013-03-05 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Eye Movements Physiology Fixation, Ocular Memory Convergence, Ocular Saccades Vision, Binocular Discipline Ophthalmology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ophthalmology Sensory Systems Cellular and Molecular Neuroscience |
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