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Experimental Brain Research

Erschienen in:

01.09.2003 | Research Article

Target similarity affects saccade curvature away from irrelevant onsets

verfasst von: Casimir J. H. Ludwig, Iain D. Gilchrist

Erschienen in: Experimental Brain Research | Ausgabe 1/2003

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Abstract

Saccade curvature away from visual distractors is a measure of the salience of these distractors for the oculomotor system. Three experiments are reported in which the integration of luminance onset signals and target similarity signals is examined, using a saccade curvature paradigm. Observers made saccades to a no-onset colour target in one of two positions on the vertical meridian. On most trials, an abrupt onset distractor that was either similar or dissimilar to the target appeared left or right on the horizontal midline. Saccades curved away from the irrelevant onsets; however, the amount of curvature was modulated by target similarity only when the onset appeared before the target (experiment 2) or when saccade initiation was delayed (experiment 3). These results suggest that the initial response to the onset is stimulus-driven and mediated by its transient component. Over time, the response is integrated with and augmented by top-down inputs. Visual and non-visual signals converge onto a common motor map to determine an item's salience.

Choosing the eye that gave the best spatial resolution assumes that the curvature effects are similar for both eyes. To verify this assumption, we analysed the curvature for both eyes of participant g3 in experiment 3. For this observer, the right eye gave the most accurate data in three out of eight blocks and the left eye was the best in the remaining five blocks. However, both eyes generally gave reasonably accurate data (with average errors ranging from 0.23° to 0.52°). Numerically the (absolute) amount of curvature differed between the two eyes by an average factor of three, with the strongest curvature always observed for the right eye. However, the pattern of results over the experimental conditions was similar for both eyes. Splitting the data by target location and similarity, the correlations of left eye and right eye curvature (relative to baseline) ranged from 0.84 to 0.96. The overall correlation was 0.92. On the basis of this analysis, we feel justified in taking the data from the eye that provided the most accurate data. In addition, these strong correlations between the two eyes suggest that saccade curvature is specified at a level before motor commands are coded for each individual eye independently

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Titel: Target similarity affects saccade curvature away from irrelevant onsets
verfasst von: Casimir J. H. Ludwig
Iain D. Gilchrist
Publikationsdatum: 01.09.2003
Verlag: Springer-Verlag
Erschienen in: Experimental Brain Research / Ausgabe 1/2003
Print ISSN: 0014-4819
Elektronische ISSN: 1432-1106
DOI: https://doi.org/10.1007/s00221-003-1520-7

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