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Effects of spontaneous eye movements on spatial memory in macaque periarcuate cortex
Puiu F Balan1, Vincent P Ferrera
1Columbia University, Department of Psychiatry, Center for Neurobiology and Behavior, David Mahoney Center for Brain and Behavior Research, New York, New York 10032, USA.
Summary
Eye movements during memory tasks degrade prefrontal cortex spatial tuning but improve performance, suggesting a rehearsal mechanism for working memory maintenance.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Primate Research
Background:
- Persistent neural activity in the prefrontal cortex is linked to spatial working memory.
- The impact of eye movements during the memory interval on this neural activity is not well understood.
Purpose of the Study:
- To investigate how spontaneous eye movements during the memory delay period affect prefrontal cortex neural activity related to spatial working memory.
- To determine if eye movements influence the neural representation of spatial information during working memory tasks.
Main Methods:
- Recorded prefrontal cortex neuronal activity in monkeys performing a delayed spatial matching saccade task.
- Monkeys were allowed to make voluntary eye movements during the memory delay interval.
- Analyzed the spatial tuning of persistent neuronal activity in relation to behavioral performance.
Main Results:
- Eye movements during the delay period degraded the spatial tuning of prefrontal cortex activity.
- Despite reduced neural tuning, behavioral performance in the working memory task improved.
- Neuronal activity continued to encode cue location, suggesting a reduction in neuronal gain rather than increased variability.
Conclusions:
- Free eye movements during working memory tasks can reduce neuronal gain in the prefrontal cortex.
- Saccades during the delay period may indicate a rehearsal mechanism contributing to memory maintenance.
- Findings do not support a strict segregation of storage and executive functions in the periarcuate cortex.