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Saccadic adaptation in the horizontal and vertical directions in normal subjects
Shoji Watanabe1, Sadao Ogino, Tadashi Nakamura
1Department of Otolaryngology, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, 216-8511, Kawasaki, Japan. s2wata@marianna-u.ac.jp
Auris, Nasus, Larynx
|January 25, 2003
Summary
Adaptive gain control in the saccadic system showed limited transfer between horizontal and vertical eye movements. Horizontal adaptation affected horizontal saccades, but vertical adaptation did not impact either direction.
Area of Science:
- Neuroscience
- Ophthalmology
- Systems Biology
Background:
- Saccadic eye movements are rapid, ballistic movements crucial for visual processing.
- Adaptive gain control allows the saccadic system to adjust to changes in visual-motor demands.
- Understanding inter-directional transfer of adaptation is key to characterizing saccadic system plasticity.
Purpose of the Study:
- To investigate adaptive gain control properties within the saccadic system.
- To determine if horizontal saccadic adaptation transfers to the vertical direction, and vice versa.
Main Methods:
- 16 healthy subjects participated in the study.
- Eye movements were tracked using a search coil system.
- Adaptation involved repeated saccades to a target with altered eccentricity (70% change).
Main Results:
- Horizontal saccadic adaptation led to decreased accuracy in horizontal vectors (P<0.05).
- Horizontal adaptation did not significantly alter vertical saccade accuracy.
- Vertical saccadic adaptation did not result in decreased accuracy for either horizontal or vertical vectors.
Conclusions:
- Adaptive gain control in the horizontal saccadic system does not appear to transfer to the vertical system.
- Conversely, vertical saccadic adaptation does not seem to transfer to the horizontal system.
- This suggests direction-specific adaptation mechanisms within the saccadic eye movement system.