A comparison of head-unrestrained and head-restrained pursuit: influence of eye position and target velocity on latency.

A comparison of head-unrestrained and head-restrained pursuit: influence of eye position and target velocity on latency. Research Abstract Details 

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A comparison of head-unrestrained and head-restrained pursuit: influence of eye position and target velocity on latency. Abstract Text:

G A Wellenius,K E Cullen,

Horizontal step-ramp target trajectories were used to study the initiation of head-unrestrained and head-restrained pursuit in the monkey. In a first series of experiments, initial target position (0 degrees, 5 degrees, or 30 degrees, contraversive to the direction of pursuit), fixation duration, target velocity (20 degrees, 40 degrees, 60 degrees and 80 degrees/s), and target direction were randomized in order to minimize predictive responses. Animals pursued the target either with their eyes alone (head-restrained: HR condition) or with a combination of eye and head movements (head-unrestrained: HU condition). Head motion onset consistently lagged pursuit onset (i.e., eye motion) by 50 ms or more in the HU condition, and was influenced by target velocity as well as by initial target position. Pursuit onset latencies did not vary systematically as a function of target velocity in either the HR or HU conditions. However, pursuit initiation latencies tended to be longer in the HU condition as compared to the HR condition when target motion started from the most contraversive position. A second series of experiments revealed that this difference in HR and HU pursuit onset latencies could be explained by the effects of initial eye-in-head position; more contraversive initial eye positions yielded shorter pursuit latencies in both conditions, and the monkeys generally moved their head towards the target in the HU condition, resulting in smaller eye-in-head eccentricities. Furthermore, we found that initial gaze and head positions had little or no effect on pursuit latencies. We conclude that the latency for pursuit initiation is similar irrespective of whether an animal is head-restrained or head-unrestrained, when initial eye position is held constant.

A comparison of head-unrestrained and head-restrained pursuit: influence of eye position and target velocity on latency. Publishing Authors By Initials

GA Wellenius,KE Cullen,

For similar therapeutics: behavior control: restraint, physical research abstracts see: therapeutics: behavior control: restraint, physical research

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A comparison of head-unrestrained and head-restrained pursuit: influence of eye position and target velocity on latency. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 133

Page Numbers: 139-55

Journal Abbreviation:

ISSN: 0014-4819

DAY: 15

MONTH: Jul

YEAR: 2000

A comparison of head-unrestrained and head-restrained pursuit: influence of eye position and target velocity on latency. Information

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LANGUAGE: eng

NlmUniqueID: 43312

A comparison of head-unrestrained and head-restrained pursuit: influence of eye position and target velocity on latency. Keywords Mesh Terms:

KEYWORDS: Restraint, Physical

MESH TERMS: physiology

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Grant and Affiliation Information for A comparison of head-unrestrained and head-restrained pursuit: influence of eye position and target velocity on latency.

AFFILIATION: Department of Physiology, McGill University, Montreal, Quebec, Canada.

Country: GERMANY

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MEDLINETA: Exp Brain Res

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