Journal
VISUAL NEUROSCIENCE
Volume 23, Issue 1, Pages 49-60Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0952523806231055
Keywords
monkey; frontal eye field; optic flow
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Funding
- NATIONAL EYE INSTITUTE [R24EY015634] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF MENTAL HEALTH [R01MH059244] Funding Source: NIH RePORTER
- NEI NIH HHS [R24 EY015634-02, R24 EY015634-04, R24 EY015634, R24 EY015634-01, R24 EY015634-03] Funding Source: Medline
- NIMH NIH HHS [MH59244, R01 MH059244] Funding Source: Medline
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The visual responsiveness and spatial tuning of frontal eye field (FEF) neurons were determined using a delayed memory saccade task. Neurons with visual responses were then tested for direction selectivity using moving random dot patterns centered in the Visual receptive field. The preferred axis of motion showed a significant tendency to be aligned with the receptive-field location so as to favor motion toward or away from the center of gaze. Centrifugal (outward) motion was preferred over centripetal motion. Motion-sensitive neurons in FEF thus appear to have a direction bias at the population level. This bias may facilitate the detection or discrimination of expanding optic flow patterns. The direction bias is similar to that Seen in Visual area MT and in posterior parietal cortex, front which FEF receives afferent projections. The Outward motion bias may explain asymmetries in saccades made to moving targets. A representation of optic flow ill FEF might be useful for planning eye movements during navigation.
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