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Neuronal switching of sensorimotor transformations for antisaccades
Nature
|January 5, 2001
Summary
The posterior parietal cortex
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Oculomotor Research
Background:
- Cognitive context influences orienting behavior.
- The memory-prosaccade/antisaccade task assesses sensorimotor transformations.
- Neuronal mechanisms for antisaccade selection remain unclear.
Purpose of the Study:
- Investigate the role of the posterior parietal cortex, specifically area LIP, in sensorimotor transformations for antisaccades.
- Determine how the brain selects and computes the correct sensorimotor transformation during antisaccade tasks.
Main Methods:
- Utilized a mixed memory-prosaccade, memory-antisaccade task.
- Recorded neuronal activity in area LIP of the posterior parietal cortex.
- Analyzed population activity and individual neuron discharges during task performance.
Main Results:
- Area LIP's population activity shifts from visual to motor direction during memory-antisaccade trials.
- A subset of LIP visual neurons exhibited a 'paradoxical' discharge.
- This paradoxical discharge occurred rapidly (within 50 ms) and indicated early switching at the visual cell level.
Conclusions:
- Area LIP is crucial for selecting and computing sensorimotor transformations in antisaccade tasks.
- Neural switching for antisaccades begins early, within visual cells in LIP.
- This rapid switching mechanism is essential for accurate orienting behavior.
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