Department of Psychology, University of Toronto-Scarborough, Toronto, Ontario, Canada.
J Exp Psychol Hum Percept Perform. 2011 Oct;37(5):1485-91. doi: 10.1037/a0024232.
Observers pointing to a target viewed directly may elevate their fingertip close to the line of sight. However, pointing blindfolded, after viewing the target, they may pivot lower, from the shoulder, aligning the arm with the target as if reaching to the target. Indeed, in Experiment 1 participants elevated their arms more in visually monitored than blindfolded pointing. In Experiment 2, pointing to a visible target they elevated a short pointer more than a long one, raising its tip to the line of sight. In Experiment 3, the Experimenter aligned the participant's arm with the target. Participants judged they were pointing below a visually monitored target. In Experiment 4, participants viewing another person pointing, eyes-open or eyes-closed, judged the target was aligned with the pointing arm. In Experiment 5, participants viewed their arm and the target via a mirror and posed their arm so that it was aligned with the target. Arm elevation was higher in pointing directly.
观察者直接指向目标时,他们的指尖可能会靠近视线。但是,蒙上眼睛,在观察完目标后,他们可能会从肩部转动,使手臂与目标对齐,好像要伸向目标一样。事实上,在实验 1 中,参与者在有视觉监控的情况下比在蒙住眼睛的情况下抬起手臂的幅度更大。在实验 2 中,参与者指向一个可见的目标时,他们会用较短的指示物抬高得更高,将其尖端指向视线。在实验 3 中,实验者将参与者的手臂与目标对齐。参与者判断他们正在指向一个在视觉监控下的目标下方。在实验 4 中,参与者在睁开眼睛或闭上眼睛的情况下观察另一个人指向目标,判断出目标与指向手臂对齐。在实验 5 中,参与者通过镜子观察自己的手臂和目标,并将手臂摆成与目标对齐的位置。直接指向时,手臂抬起的幅度更高。