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Switching of sensorimotor transformations: antisaccades and parietal cortex.
Shabtai Barash1, Mingsha Zhang
1Department of Neurobiology, Weizmann Institute of Science, Rehovot 76100, Israel.
Novartis Foundation Symposium
|May 3, 2006
Summary
Switching sensorimotor transformations in complex tasks requires contextual information. This study suggests parietal and prefrontal cortex interactions facilitate this cognitive switching process.
Area of Science:
- Neuroscience
- Cognitive Science
- Systems Neuroscience
Background:
- Complex sensorimotor processing involves more than direct transformation application.
- Contextual cues necessitate dynamic switching between sensorimotor transformations.
Purpose of the Study:
- Investigate the neural mechanisms underlying sensorimotor transformation switching.
- Examine the role of the lateral intra-parietal area (LIP) and prefrontal cortex in this process.
Main Methods:
- Utilized a mixed memory prosaccade/antisaccade task to study sensorimotor switching.
- Analyzed neuronal activity patterns in LIP and prefrontal cortex.
Main Results:
- LIP neurons may compute transformations for both prosaccades and antisaccades.
- Observed paradoxical activity patterns in LIP (motor in space, visual in time) and prefrontal cortex (visual in space, motor in time).
Conclusions:
- Proposed a model where parietal cortex handles sensorimotor transformations and prefrontal cortex handles context categorization.
- Hypothesized a feedback loop between parietal and prefrontal cortices, crucial for switching, with a duration under 100 ms.