Functional Significance of Visually Triggered Discharges in Eye Movement Related Neurons
Gaze orientation is a quick, natural, almost automatic reaction. Yet, in the couple of hundred milliseconds that separate the appearance of a photic target and the orientation of the gaze to it, the CNS has to make a number of delicate computations and decisions. The where, how, and when of the movement have to be determined. Analysis of single-unit events occurring during this period suggests that the spatial coordinates of the goal are calculated immediately upon stimulus presentation. The information predictive of the trajectory of the orienting movement to be performed appears already available in what, on the basis of fixed latency, would be considered stimulus-locked visual response. The actual launching of the saccade is a separate, subsequent decision.
KeywordsRetina Peri Stim
Unable to display preview. Download preview PDF.
- Hyvarinen, J., and Poranen, A., 1974, Function of the parietal association area 7 as revealed from cellular discharges in alert monkeys, Brain 97: 673.Google Scholar
- Kasdon, D. L., and Jacobson, S., 1978, The thalamic afferents to the inferior parietal lobule of the rhesus monkey, J. comp. Neurol. 177:685.Google Scholar
- Kotchabhakdi, N., Rinvik, E., Yingchareon, K., and Walberg, F., 1980, Afferent projections to the thalamus from the perihypoglossal nuclei, Brain Res. 187: 457.Google Scholar
- Leichnetz, G. R., Spencer, R. F., Hardy, S. G. P., and Astruc, J., 1981, The prefrontal corticotectal projection in the monkey: an anterograde and retrograde horseradish peroxidase study, Neurosci. 6: 1023.Google Scholar
- Lynch, J. C., Mountcastle, V. B., Talbot, W. H., and Yin, T. C., 1977, Parietal lobe mechanisms for direct attention, J. Neurophysiol. 40:362Google Scholar
- Maldonado, H., and Schlag, J., 1981, Head and eye movements evoked by electrical stimulation of thalamic gaze center, Neurosci. Abstr. (in press).Google Scholar
- Mohler, C. W., Goldberg, M. E., and Wurtz, R. H., 1973, Visual receptive fields of frontal eye field neurons, Brain Res. 61:385.Google Scholar
- Orem, J., Schlag-Rey, M., and Schlag, J., 1973, Unilateral visual neglect and thalamic intralaminar lesions in the cat, Exp. Neurol. 40:784.Google Scholar
- Schlag, J., and Schlag-Rey, M., 1977, Visuomotor properties of cells in the cat thalamic internal medullary lamina, in: “Control of gaze by brain stem neurons,” R. Baker and A. Berthoz, eds., Elsevier, Amsterdam, pp. 453–462.Google Scholar
- Schlag-Rey, M., and Schlag, J., Eye-movement related neuronal activity in the central thalamus of monkeys, in: “Progress in oculomotor research,” A. Fuchs and W. Becker, eds., Elsevier, Amsterdam, (in press).Google Scholar
- Thompson, J. A., 1980, How do we use visual information to control locomotion?, TINS 3: 247.Google Scholar
- Watson, R. T., Mohler, B. D., and Heilman, K. M., 1978, Nonsensory neglect, Ann. Neurol. 3:505.Google Scholar