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Role of monkey superior colliculus in saccade averaging

✍ Scribed by A. J. Opstal; J. A. M. Gisbergen

Publisher
Springer-Verlag
Year
1990
Tongue
English
Weight
683 KB
Volume
79
Category
Article
ISSN
0014-4819

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✦ Synopsis

We have investigated the involvement of collicular movement cells in the monkey in the execution of averaging saccades, elicited by a visual double-step stimulus. We found that, qualitatively, most (12/14) movement cells were recruited during averaging saccades in roughly the same way as for comparable visually-elicited saccades to single targets (V-saccades). However, movement-cell responses during averaging saccades in trials where the target suddenly changed direction were often less intense than for a comparable V-saccade. In these cases, the averaging responses were observed to be also slower than V-saccades of the same amplitude. Firing rate and double-step saccade dynamics were found to be significantly correlated in 9/14 cells tested. Several hypotheses for the collicular role in the generation of averaging saccades are discussed.

πŸ“œ SIMILAR VOLUMES

Representation of averaging saccades in
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✍ Paul W. Glimcher; David L. Sparks πŸ“‚ Article πŸ“… 1993 πŸ› Springer-Verlag 🌐 English βš– 724 KB

We tested the hypothesis that averaging saccades occur when two different saccades are prepared and executed simultaneously. The activity of saccade-related burst neurons (SRBNs) in the primate superior colliculus was recorded while monkeys made both non-averaging saccades to single targets and aver

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✍ Nobuo Miyashita; Okihide Hikosaka πŸ“‚ Article πŸ“… 1996 πŸ› Springer-Verlag 🌐 English βš– 1011 KB

The synaptic organization of the saccade-related neuronal circuit between the superior colliculus (SC) and the brainstem saccade generator was examined in an awake monkey using a saccadic, midflight electrical-stimulation method. When microstimulation (50-100 microA, single pulse) was applied to the

Saccadic eye movements following injecti
Saccadic eye movements following injection of lidocaine into the superior colliculus
✍ O. Hikosaka; R. H. Wurtz πŸ“‚ Article πŸ“… 1986 πŸ› Springer-Verlag 🌐 English βš– 836 KB

Ablation of the superior colliculus (SC) has generally produced limited deficits in the initiation of saccadic eye movements, usually an increase in the latency of saccades. However, recent studies using muscimol, a GABA agonist, to block afferents to the SC showed deficits in not only latency but i

Projections from the superior colliculus
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✍ BοΏ½ttner-Ennever, Jean A.; Horn, Anja K.E.; Henn, V.; Cohen, B. πŸ“‚ Article πŸ“… 1999 πŸ› John Wiley and Sons 🌐 English βš– 1012 KB

Descending projections from the superior colliculus (SC) motor map to the saccadic omnipause neurons (OPNs) were examined in monkeys by using anterograde transport of tritiated leucine. The SC was divided into three zones: the rostral pole of the motor map, a small horizontal saccade zone in central

Bilateral projections from the parabigem
Bilateral projections from the parabigeminal nucleus to the superior colliculus in monkey
✍ J. S. Baizer; J. F. Whitney; D. B. Bender πŸ“‚ Article πŸ“… 1991 πŸ› Springer-Verlag 🌐 English βš– 439 KB

We examined the distribution of labeled neurons in the parabigeminal nucleus of the monkey following injections of retrograde fluorescent tracers into the superior colliculus. The extent of the visual field representation included in the injection site was assessed from the location of labeled cells