JN Ad Instruments
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
 QUICK SEARCH:   [advanced]


     


J Neurophysiol (March 12, 2003). doi:10.1152/jn.00033.2003
This Article
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
90/1/226    most recent
00033.2003v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Livingston, C. A.
Right arrow Articles by Rickert Fedder, S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Livingston, C. A.
Right arrow Articles by Rickert Fedder, S.
Submitted on January 14, 2003
Accepted on March 1, 2003

VISUAL-OCULAR MOTOR ACTIVITY IN THE MACAQUE PREGENICULATE COMPLEX

Christine A. Livingston1* and Stacey Rickert Fedder2

1 Marine Biomedical Institute, Anatomy & Neurosciences, University of Texas Medical Branch, Galveston, Texas, USA
2 School of Medicine, University of Texas Health Science Center, San Antonio, Texas, USA

* To whom correspondence should be addressed. E-mail: clivings{at}usd.edu.

The anatomical connections of the pregeniculate complex (PrGC) with components of the visual-ocular motor system, suggested its contribution to ocular motor behavior. Subsequent studies reported saccade-related activity in the primate PrGC. To determine its contribution, we characterized pregeniculate units (n = 128) in alert macaques during ocular motor tasks and visual stimulation. 1. We found that 36/109 saccade-related units exhibited post-saccadic bursts or pauses in tonic discharge for saccades of any amplitude or direction. In contrast to previous results, 46/109 responses preceded or coincided with the saccade, while 47/109 responses were directionally tuned. 2. Pregeniculate units were modulated not only in association with saccades (109/128), but also with smooth eye movements and visual motion (20/128), or eye position (23/128). 3. Multiple ocular motor signals were recorded from 19% of the units, indicating signal convergence on individual neurons. 4. Visual responses were demonstrated in 51% of PrGC units: Visual field illumination modulated the resting discharge of 33 units; the responses of 37 saccade-related units and all 23 position-dependent units were modulated by visual stimulation. Early saccadic activity in the PrGC suggests that it contributes more to gaze than post-saccadic modulation of visual or ocular motor activity. The patterns of saccadic responses and the modulation of PrGC activity in association with a variety of visual-ocular motor behaviors suggest its potential role as a relay between the parietal cortex and elements of the brainstem ocular motor pathways, such as the superior colliculus and pretectal nucleus of the optic tract.




This article has been cited by other articles:


Home page
J. Neurophysiol.Home page
N. A. Crowder, N. S. C. Price, M. J. Mustari, and M. R. Ibbotson
Direction and Contrast Tuning of Macaque MSTd Neurons During Saccades
J Neurophysiol, June 1, 2009; 101(6): 3100 - 3107.
[Abstract] [Full Text] [PDF]




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
Visit Other APS Journals Online
Copyright © 2003 by the The American Physiological Society.