Eye position-sensitive units in hippocampal formation and in inferotemporal cortex of the Macaque monkey
Article first published online: 9 OCT 2008
European Journal of Neuroscience
Volume 12, Issue 2, pages 751–759, February 2000
How to Cite
Nowicka, A. and Ringo, J. L. (2000), Eye position-sensitive units in hippocampal formation and in inferotemporal cortex of the Macaque monkey. European Journal of Neuroscience, 12: 751–759. doi: 10.1046/j.1460-9568.2000.00943.x
- Issue published online: 9 OCT 2008
- Article first published online: 9 OCT 2008
- Received 22 June 1999, revised 29 October 1999, accepted 1 November 1999
- eye movements;
- single unit;
- spatial field
The activity of 330 hippocampal and inferotemporal cells was recorded while seated monkeys with fixed heads worked in a visual discrimination task. Monkeys had to move their eyes to one of five different positions to maintain gaze on an image. The image was then extinguished and the monkeys maintained a fixed gaze on the target position in darkness to obtain a reward. The five positions of image presentation were on a horizontal line, consisting of a centre position and lateral positions which were 10 and 20 degrees right and left of it.
Twenty-two per cent of single units recorded from the hippocampus showed statistically significant sensitivity to target position in complete darkness. A similar fraction (23%) was significantly affected by target position in the light. Position sensitivity was also found among cells recorded from the inferotemporal cortex. Eye position significantly influenced the activity of 19% of inferotemporal units in darkness and 28% of inferotemporal units in the light. Interestingly, the populations of cells showing position effect in the light and in darkness were independent.