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Selective and delay adaptation of human saccades
Masahiko Fujita1, Akihiro Amagai, Futaba Minakawa
1Human Neurosystem Science Laboratory, Department of Industrial and Systems Engineering, Faculty of Engineering, Hosei University, 3-7-2 Kajino-cho, Koganei-shi, Tokyo 184-8584, Japan. fujita@k.hosei.ac.jp
Brain Research. Cognitive Brain Research
|February 28, 2002
Summary
Human saccades adapt to target displacement, improving accuracy in memory-guided and visually-guided eye movements. This adaptation shows partial transfer between saccade types, indicating independent adaptive capabilities.
Area of Science:
- Neuroscience
- Ophthalmology
- Human motor control
Background:
- Saccades are rapid eye movements crucial for visual exploration.
- Visually guided saccades demonstrate well-established gain adaptation.
- The adaptive capabilities of memory-guided saccades remain less understood.
Purpose of the Study:
- To investigate gain adaptation in human memory-guided saccades.
- To examine the transfer of adaptation between memory-guided and visually-guided saccades.
- To explore the temporal properties of saccade adaptation mechanisms.
Main Methods:
- Human subjects performed primary saccades to a target that consistently stepped back.
- Gain adaptation was measured by the ratio of saccade amplitude to target eccentricity.
- Adaptation transfer was assessed between memory-guided and two types of visually-guided saccades.
Main Results:
- Consistent target displacement induced gradual gain adaptation in memory-guided saccades.
- Subjects achieved accurate foveation of displaced targets after adaptation.
- Adaptation showed 10-25% transfer between different saccade types.
- Each saccade type exhibited independent adaptive capabilities.
- Adaptation occurred even with a 400-600 ms delay in target appearance.
Conclusions:
- Human memory-guided saccades exhibit gain adaptation similar to visually-guided saccades.
- Saccade adaptation mechanisms possess a degree of independence.
- The findings provide insights into the location and timing of adaptive mechanisms in saccade generation.