The location marker effect: saccadic latency increases with target eccentricity

Hodgson, Timothy L. (2002) The location marker effect: saccadic latency increases with target eccentricity. Experimental Brain Research, 145 (4). pp. 539-542. ISSN 0014-4819

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Previous studies have shown that the retinal eccentricity of target stimuli has surprisingly little effect on the latency of visually driven saccades. But up until now researchers have addressed this issue by presenting saccadic targets in an unstructured visual field. This contrasts with everyday vision in which eye movements are initiated to stimuli within a cluttered environment. The present experiment compared latencies for target onsets in an empty visual field with a condition in which continuously illuminated location markers "tagged" the possible target locations. Previous reports of no effect of eccentricity on latencies in an unstructured field were replicated. However, a significant effect of eccentricity was found when location markers were used. Interestingly this did not reflect a lengthening of latencies as would be predicted by a reduction in target discriminability. Instead, latencies were relatively facilitated to near-visual onsets in the location marker condition. It is concluded that under more natural viewing conditions the latency of saccades is likely to be modulated by the eccentricity of target stimuli. This effect can be explained by competitive attentional interactions in saccade target selection processes.

Keywords:adult, article, competition, controlled study, eye movement, female, human, human experiment, latent period, male, normal human, prediction, priority journal, saccadic eye movement, vision, visual field, visual stimulation, Adult, Attention, Brain, Cues, Humans, Photic Stimulation, Psychomotor Performance, Reaction Time, Saccades, Visual Fields, Visual Perception
Subjects:C Biological Sciences > C850 Cognitive Psychology
C Biological Sciences > C810 Applied Psychology
C Biological Sciences > C840 Clinical Psychology
Divisions:College of Social Science > School of Psychology
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ID Code:10544
Deposited On:16 Dec 2013 18:27

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