Roberts Roberta D, Humphreys Glyn W
School of Psychology, University of Birmingham, Edgbaston, Birmingham, England.
J Exp Psychol Hum Percept Perform. 2008 Jun;34(3):592-604. doi: 10.1037/0096-1523.34.3.592.
The ability to report the temporal order of 2 tactile stimuli (1 applied to each hand) has been shown to decline when the arms are crossed over compared with when they are uncrossed. However, these effects have only been measured when temporal order was reported by stimulus location. It is unknown whether this spatial manipulation of the body affects all tactile temporal order judgments (TOJs) or only those judgments that are spatially defined. The authors examined the effect of crossing the arms on tactile TOJs when stimuli were identified by either spatial (location) or nonspatial (frequency or duration) attributes. Spatial TOJs were significantly impaired when the arms were in crossed compared with uncrossed postures, but there was no effect of posture when order was judged by nonspatial attributes. Task-dependent modulation of the effects of posture was also evident when response complexity was reduced to go/no-go responses. These results suggest that crossing the arms impairs tactile localization and thus spatial TOJs. However, the data also suggest that localization is not a necessary precursor when temporal order can be computed by nonspatial means.
与双臂不交叉时相比，当双臂交叉时，报告两个触觉刺激（分别施加于每只手）的时间顺序的能力已显示出下降。然而，这些影响仅在通过刺激位置报告时间顺序时进行了测量。尚不清楚身体的这种空间操作是会影响所有触觉时间顺序判断（TOJ），还是仅影响那些在空间上定义的判断。作者研究了双臂交叉对触觉TOJ的影响，此时刺激是通过空间（位置）或非空间（频率或持续时间）属性来识别的。与双臂不交叉的姿势相比，当双臂交叉时，空间TOJ显著受损，但当通过非空间属性判断顺序时，姿势没有影响。当反应复杂性降低为“去/不去”反应时，姿势影响的任务依赖性调制也很明显。这些结果表明，双臂交叉会损害触觉定位，从而影响空间TOJ。然而数据也表明，当可以通过非空间方式计算时间顺序时，定位不是必要的前提条件。
