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Spatial processing in the monkey frontal eye field. II. Memory responses.
1Laboratory of Sensorimotor Research, National Eye Institute, Bethesda, Maryland 20892, USA.
Journal of Neurophysiology
|November 8, 2001
Summary
Monkeys and humans use short-term spatial memory to track visual stimuli during eye movements. Neurons in the frontal eye field show both immediate and longer-lasting memory responses, even without continuous visual input.
Area of Science:
- Neuroscience
- Cognitive Science
- Ophthalmology
Background:
- Humans and monkeys can accurately track visual stimuli with eye movements (saccades) even when stimuli appear and disappear.
- The underlying memory mechanisms enabling this visual tracking behavior are not fully understood.
Purpose of the Study:
- To investigate the neural basis of short-term and intertrial memory responses during saccadic eye movements.
- To explore how the frontal eye field (FEF) maintains spatial representations of visual stimuli.
Main Methods:
- Utilized the flashed-stimulus task in monkeys to record neural activity in the FEF.
- Measured neuronal responses (visuomovement and visual cells) during saccades to remembered stimulus locations.
- Analyzed both within-trial and intertrial memory responses.
Main Results:
- A significant number of visuomovement and visual cells showed short-term spatial memory responses, firing predictively or post-saccade.
- These memory responses occurred even when stimuli were transient and outside the neuron's receptive field.
- A subset of neurons exhibited a longer-term intertrial memory response, firing on trials without visual stimuli.
Conclusions:
- The frontal eye field maintains a spatially accurate visual representation independent of continuous stimulation.
- This neural representation can persist for several minutes, supporting accurate saccadic eye movements.
- Suggests FEF plays a critical role in visual working memory and guiding gaze behavior.