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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
Published on: March 18, 2019
Bilateral saccades increase intrahemispheric processing but not interhemispheric interaction: Implications for
Keith B Lyle1, Jessica M Martin
1Department of Psychological and Brain Sciences, University of Louisville, Louisville, KY 40292, USA. keith.lyle@louisville.edu
Brain and Cognition
|May 11, 2010
Summary
Making saccades (rapid eye movements) before memory retrieval boosts accuracy, particularly for tasks within one brain hemisphere. This suggests saccades enhance intrahemispheric processing, not interhemispheric interaction as previously hypothesized.
Area of Science:
- Cognitive Neuroscience
- Ophthalmology
- Psychology
Background:
- Retrieval of memories can be enhanced by specific pre-retrieval actions.
- Bilateral saccades, or rapid eye movements, are hypothesized to improve memory retrieval by increasing brain hemisphere interaction.
Purpose of the Study:
- To investigate the effect of saccades on memory retrieval accuracy.
- To test the hypothesis that saccades enhance memory retrieval by promoting interhemispheric interaction.
Main Methods:
- Subjects performed a letter matching task involving lateralized stimuli.
- Stimuli were presented either within the same hemisphere or across different hemispheres.
- Performance was compared following saccades versus a fixation control condition.
Main Results:
- Saccades significantly increased match-detection accuracy on within-hemisphere trials.
- Saccades did not enhance accuracy on across-hemisphere trials, contradicting the initial hypothesis.
- Higher accuracy on across-hemisphere trials was observed in non-strongly right-handed individuals, suggesting greater interhemispheric interaction.
Conclusions:
- Saccades appear to enhance memory retrieval primarily through intrahemispheric processing.
- The findings challenge the hypothesis that saccades improve retrieval by increasing interhemispheric interaction.
- Individual differences in handedness may correlate with baseline levels of interhemispheric interaction.
