Related Experiment Videos
Different motor systems use similar damped extraretinal eye position information
1Smith-Kettlewell Eye Research Institute, San Francisco, CA 94115, USA. bockisch@skivs.ski.org
Vision Research
|May 26, 1999
Summary
Extraretinal eye position information (EEPI) remapping occurs similarly for hand and gaze pointing, beginning before saccades. This visual processing shift is consistent across different pointing methods and locations.
Area of Science:
- Neuroscience
- Vision Science
- Human Motor Control
Background:
- Extraretinal eye position information (EEPI) is crucial for updating visual representations during eye movements.
- Previous studies show varied estimates for EEPI remapping initiation and duration, potentially due to methodological differences.
Purpose of the Study:
- To directly compare EEPI remapping in manual and gaze pointing under identical conditions.
- To investigate the influence of retinal locus and saccade target predictability on EEPI.
Main Methods:
- Subjects performed manual and gaze pointing to probe flashes at controlled retinal locations before, during, and after saccades.
- Stimulus conditions, including saccade target predictability, were kept constant.
Main Results:
- EEPI remapping duration was approximately 140 ms, initiating around 50 ms before saccades for both manual and gaze pointing.
- Remapping initiation was delayed for parafoveal loci compared to peripheral loci.
- Saccade target predictability did not affect EEPI remapping.
Conclusions:
- Similar EEPI parameters are applicable to hand pointing, eye pointing, and visual comparisons.
- Variability in EEPI duration estimates across studies likely stems from differing experimental conditions rather than fundamental differences in the remapping process.