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Research article summary:
Planning of saccadic eye movements.
Abstract Extract:
Most theories of the programming of saccadic eye movements (SEM) agree that direction and amplitude are the two basic dimensions that are under control when an intended movement is planned. But they disagree over whether these two basic parameters are ... (Full abstract text below) Published 2003Feb
in Journal: Psychol Res
(Language : eng)
Full Pubmed Extract
This information was retrieved, real-time, on your behalf from the public area of the Pubmed website:
1. Psychol Res.
2003 Feb;67(1):10-21
Planning of saccadic eye movements.
Allik J, Toom M, Luuk A
Department of Psychology, University of Tartu, Tiigi 78, Tartu 50410, Estonia. jyri@psych.ut.ee
Most theories of the programming of saccadic eye movements (SEM) agree that direction and amplitude are the two basic dimensions that are under control when an intended movement is planned. But they disagree over whether these two basic parameters are specified separately or in conjunction. We measured saccadic reaction time (SRT) in a situation where information about amplitude and direction of the required movement became available at different moments in time. The delivery of information about either direction or amplitude prior to another reduced duration of SRT demonstrated that direction and amplitude were specified separately rather than in conjunction or in a fixed serial order. All changes in SRT were quantitatively explained by a simple growth-process (accumulator) model according to which a movement starts when two separate neural activities, embodying the direction and amplitude programming, have both reached a constant threshold level of activity. Although, in isolation, the amplitude programming was faster than the direction programming, the situation reversed when two dimensions had to be specified at the same time. We conclude that beside the motor maps representing the desired final position of the eye or a fixed movement vector, another processing stage is required in which the basic parameters of SEM, direction and amplitude, are clearly separable.
PMID : 12589446 [PubMed - Indexed for MEDLINE]
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Full Author Information
| First Name | LastName | Initials |
| Jüri | Allik | J |
| Mai | Toom | M |
| Aavo | Luuk | A |
Affiliation: Department of Psychology, University of Tartu, Tiigi 78, Tartu 50410, Estonia. jyri@psych.ut.ee
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