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

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

Auteurs : Kelly M. Goedert [États-Unis] ; Andrew Leblanc [États-Unis] ; Sen-Wei Tsai [Taïwan] ; Anna M. Barrett [États-Unis]

Source :

Journal of the International Neuropsychological Society : JINS [ 1355-6177 ] ; 2010.

RBID : PMC:2953607

Abstract

Proposals that adaptation with left-shifting prisms induces neglect-like symptoms in normal individuals rely on a dissociation between the post-adaptation performance of individuals trained with left- versus right-shifting prisms (e.g., Colent, et al. 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.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2953607

DOI: 10.1017/S1355617710000597
PubMed: 20598215
PubMed Central: 2953607

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PMC:2953607

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<front><div type="abstract" xml:lang="en"><p id="P1">Proposals that adaptation with left-shifting prisms induces neglect-like symptoms in normal individuals rely on a dissociation between the post-adaptation performance of individuals trained with left- versus right-shifting prisms (e.g., <xref ref-type="bibr" rid="R8">Colent, et al. 2000</xref>
). A potential problem with this evidence is that normal young adults have an a priori leftward bias (e.g., <xref ref-type="bibr" rid="R17">Jewell & McCourt, 2000</xref>
). 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.</p>
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Asymmetrical Effects of Adaptation to Left and Right Shifting Prisms Depends on Pre-Existing Attentional Biases

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

Source :

Abstract

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