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Exp Brain Res (2016) 234:27612772 DOI 10.1007/s00221-016-4678-5
RESEARCH ARTICLE
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Web End = Prism adaptation magnitude has differential inuences on perceptual versus manual responses
Christopher L. Striemer1,2 Karyn Russell1 Priya Nath1
Abstract Previous research has indicated that rightward prism adaptation can reduce symptoms of spatial neglect following right brain damage. In addition, leftward prism adaptation can create neglect-like patterns of performance in healthy adults on tasks that measure attention and spatial biases. Although a great deal of research has focused on which behaviors are inuenced by prism adaptation, very few studies have focused directly on how the magnitude of visual shift induced by prisms might be related to the observed aftereffects, or the effects of prisms on measures of attentional and spatial biases. In the current study, we examined these questions by having groups of healthy adult participants complete manual line bisection and landmark tasks prior to and following adaptation to either 8.5 (15 diopter; n = 22) or 17 (30 diopter; n = 25) leftward
shifting prisms. Our results demonstrated a signicantly larger rightward shift in straight-ahead pointing (a measure of prism aftereffect) following adaptation to 17, compared to 8.5 leftward shifting prisms. In addition, only 17 leftward shifting prisms resulted in a signicant rightward shift in line bisection following adaptation. However, there was a signicant change in performance on the landmark task pre- versus post-adaptation in both the 8.5 and 17 leftward shifting prism groups. Interestingly, correlation
Electronic supplementary material The online version of this article (doi:http://dx.doi.org/10.1007/s00221-016-4678-5
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* Christopher L. Striemer [email protected]
1 Department of Psychology, MacEwan University, 10700 104 Avenue, Edmonton, AB T5J 4S2, Canada
2 Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB, Canada
Received: 26 November 2015 / Accepted: 13 May 2016 / Published online: 20 May 2016 Springer-Verlag Berlin Heidelberg 2016
analyses indicated that changes in straight-ahead pointing pre- versus post-adaptation were positively correlated with changes in performance on the manual line bisection task, but not the landmark task. These data suggest that larger magnitudes of prism adaptation seem to have a greater inuence on tasks that require a response with the adapted hand (i.e., line bisection), compared to tasks...