Loftus Andrea M, Nicholls Michael E R, Mattingley Jason B, Bradshaw John L
School of Behavioural Science, University of Melbourne, Vic. 3056, Australia.
Cognition. 2008 Jun;107(3):1048-58. doi: 10.1016/j.cognition.2007.09.007. Epub 2007 Oct 29.
Adaptation to right-shifting prisms improves left neglect for mental number line bisection. This study examined whether adaptation affects the mental number line in normal participants. Thirty-six participants completed a mental number line task before and after adaptation to either: left-shifting prisms, right-shifting prisms or control spectacles that did not shift the visual scene. Participants viewed number triplets (e.g. 16, 36, 55) and determined whether the numerical distance was greater on the left or right side of the inner number. Participants demonstrated a leftward bias (i.e. overestimated the length occupied by numbers located on the left side of the number line) that was consistent with the effect of pseudoneglect. The leftward bias was corrected by a short period of visuomotor adaptation to left-shifting prisms, but remained unaffected by adaptation to right-shifting prisms and control spectacles. The findings demonstrate that a simple visuomotor task alters the representation of space on the mental number line in normal participants.
适应向右偏移的棱镜可改善对心理数字线二等分的左侧忽视。本研究考察了适应是否会影响正常参与者的心理数字线。三十六名参与者在适应以下情况之前和之后完成了心理数字线任务：向左偏移的棱镜、向右偏移的棱镜或不改变视觉场景的对照眼镜。参与者观看数字三元组（例如16、36、55），并确定数字距离在内侧数字的左侧还是右侧更大。参与者表现出向左偏差（即高估了位于数字线左侧的数字所占的长度），这与假性忽视的效应一致。通过对向左偏移的棱镜进行短时间的视觉运动适应可纠正向左偏差，但对向右偏移的棱镜和对照眼镜的适应对其没有影响。研究结果表明，一项简单的视觉运动任务会改变正常参与者心理数字线上空间的表征。
