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Visually Guided Saccade Adaptation: Transfer to Averaging Saccades Elicited by Double Visual Stimuli
Author(s) -
ALAHYANE NADIA,
PÉLISSON DENIS
Publication year - 2003
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1303.035
Subject(s) - humanities , psychology , art
In the current study, we tested in human subjects the transfer of automatic horizontal VGS adaptation to saccades elicited by the simultaneous presentation of two visual targets vertically separated and located symmetrically around the position where the target of trained VGS had been presented. We were particularly interested in the averaging saccades which were directed toward an intermediate position between the two stimuli and which described a vector similar to that of the horizontal trained VGS. The rationale is illustrated in FIGURE 1 (panels A−C). If the adaptation of VGS modifies the visuosaccadic pathways at a level at which the two oblique saccadic components directed toward each of the two targets presented separately are encoded, upstream of the level of integration into a single motor command (hypothesis 1), then the transfer to averaging saccades should equal the mean of amplitude modifications of the two oblique VGS. Conversely, if adaptation acts downstream (hypothesis 2), then the transfer should equal the amplitude modification of the horizontal VGS.