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Macaque supplementary eye field neurons encode object-centered locations relative to both continuous and
1Center for the Neural Basis of Cognition, Mellon Institute, Pittsburgh, Pennsylvania 15213-2683, USA.
Journal of Neurophysiology
|April 12, 2000
Summary
Neurons in the supplementary eye field (SEF) use object-centered signals for eye movements. These signals remain consistent whether the visual reference is a continuous bar or discrete dots, indicating robust directional coding.
Area of Science:
- Neuroscience
- Ocular motor control
- Primate vision
Background:
- The supplementary eye field (SEF) is implicated in eye movement control.
- Previous research suggests SEF neurons may carry object-centered directional signals.
- The dependence of these signals on visual continuity is not well understood.
Purpose of the Study:
- To investigate the nature of object-centered direction selectivity in SEF neurons.
- To determine if SEF directional signals are contingent upon the physical continuity of a visual reference image.
Main Methods:
- Neuronal activity was recorded from 143 neurons in the SEF of two macaque monkeys.
- Neural responses were compared during eye movements to a continuous horizontal bar versus a pair of discrete horizontal dots.
- Task-related activity was assessed in a standard saccade task.
Main Results:
- The majority of SEF neurons demonstrated object-centered direction selectivity, responding similarly to bar and dot stimuli.
- Directional selectivity was maintained regardless of whether the visual reference was continuous or disjunct.
- A smaller subset of neurons showed minor differences in firing rates between bar and dot conditions.
Conclusions:
- SEF neurons encode object-centered directional information.
- This directional coding is robust and independent of the visual reference's physical continuity.
- SEF neurons provide reliable spatial signals for eye movements based on object properties rather than continuous visual input.