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Asymmetrical Effects of Adaptation to Left- and Right-Shifting Prisms Depends on Pre-existing Attentional Biases

Published online by Cambridge University Press:  05 July 2010

KELLY M. GOEDERT ,
ANDREW LEBLANC ,
SEN-WEI TSAI  and
ANNA M. BARRETT
KELLY M. GOEDERT*
Affiliation:
Department of Psychology, Seton Hall University, South Orange, New Jersey
ANDREW LEBLANC
Affiliation:
Department of Psychology, Seton Hall University, South Orange, New Jersey
SEN-WEI TSAI
Affiliation:
Department of Physical Medicine and Rehabilitation, Taichung Veterans General Hospital, Taichung, Taiwan
ANNA M. BARRETT
Affiliation:
Kessler Foundation Research Center, West Orange, New Jersey Departments of Physical Medicine and Rehabilitation and Neurology and Neurosciences, University of Medicine and Dentistry of New Jersey, NJ Medical School, Newark, New Jersey
*
*Correspondence and reprint requests to: Kelly M. Goedert, Department of Psychology, Seton Hall University, 400 South Orange Avenue, South Orange, NJ 07079. E-mail: kelly.goedert@shu.edu
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Abstract

Proposals that adaptation with left-shifting prisms induces neglect-like symptoms in normal individuals rely on a dissociation between the postadaptation performance of individuals trained with left- versus right-shifting prisms (e.g., Colent, Pisella, & Rossetti, 2000). A potential problem with this evidence is that normal young adults have an a priori leftward bias (e.g., Jewell & McCourt, 2000). In Experiment 1, we compared the line bisection performance of young adults to that of aged adults, who as a group may lack a leftward bias in line bisection. Participants trained with both left- and right-shifting prisms. Consistent with our hypothesis, while young adults demonstrated aftereffects for left, but not right prisms, aged adults demonstrated reliable aftereffects for both prisms. In Experiment 2, we recruited a larger sample of young adults, some of whom were right-biased at baseline. We observed an interaction between baseline bias and prism-shift, consistent with the results of Experiment 1: Left-biased individuals showed a reduced aftereffect when training with right-shifting prisms and right-biased individuals showed a reduced aftereffect when training with left-shifting prisms. These results suggest that previous failures to find generalizable aftereffects with right-shifting prisms may be driven by participants’ baseline biases rather than specific effects of the prism itself. (JINS, 2010, 16, 795–804.)

Keywords

Hemispatial neglectPrism adaptationLine bisectionAttentionMotorPerceptual
Type
Research Articles
Information
Journal of the International Neuropsychological Society , Volume 16 , Issue 5 , September 2010 , pp. 795 - 804
Copyright
Copyright © The International Neuropsychological Society 2010

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