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
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DOI：
10.1017/s1355617710000597
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发表时间：
2010-09-01
影响因子：
2.6
通讯作者：
Barrett, Anna M.
中科院分区：
文献类型：
--
作者：
Goedert, Kelly M.;Leblanc, Andrew;Barrett, Anna M.
左移棱镜适应在正常个体中诱导忽视样症状的建议依赖于左移棱镜与右移棱镜训练的个体的适应后表现之间的分离（例如，Colent，Pisella，& Rossetti，2000）.这一证据的一个潜在问题是，正常的年轻人有一个先验的偏见（例如，朱厄尔和麦考特，2000年）。在实验1中，我们比较了年轻成年人的线平分性能的老年人，作为一个群体，可能缺乏一个在线平分偏置。参与者接受了左移和右移棱镜的训练。与我们的假设相一致，虽然年轻人表现出左，但不是右棱镜的后效，老年人表现出可靠的两个棱镜的后效。在实验2中，我们招募了更多的年轻人样本，其中一些人在基线时有右偏。我们观察到基线偏差和棱镜移位之间的相互作用，与实验1的结果一致：左偏个体在右移棱镜训练时表现出减少的后效，右偏个体在左移棱镜训练时表现出减少的后效。这些结果表明，以前未能找到可推广的后效与右移棱镜可能是由参与者的基线偏差，而不是棱镜本身的具体影响。(JINS，2010，16，795-804.）
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.)