Power R P
Department of Psychology, Macquarie University, Sydney, NSW, Australia.
Percept Mot Skills. 1994 Aug;79(1 Pt 1):131-40. doi: 10.2466/pms.1994.79.1.131.
Power and Moulden have proposed a model which accounts for the movement of gratings in apertures including the barber pole illusion. It predicts the direction of motion aftereffects which follow from perceived veridical motion and the direction of these aftereffects which follow from the illusory movement experienced during the barber pole illusion. At a perceptual level, the model predicts motion aftereffects will follow direction of apparent movement rather than veridical direction. Four experiments tested this prediction. In Exp. 1 a spiral was viewed under flickering light so it appeared to be moving in the direction opposite to true motion, and the aftereffect was opposite to the apparent direction. In Exp. 2 the spiral was viewed through a narrow aperture so that it was effectively a grating appearing to move in the opposite direction to veridical motion. Again, the motion aftereffect was opposite to the apparent rather than true direction of rotation. In Exp. 3 a sectored disc was used, and similar results were obtained. In Exp. 4 the sectored disc was videotaped so that it appeared to be rotating in the direction opposite to true motion. The after motion to this "wagon wheel" effect was opposite to its apparent direction of rotation on the screen. In all experiments the predictions were confirmed, thereby confirming the general principle that motion aftereffects follow apparent rather than real direction of movement.
鲍尔和莫尔登提出了一个模型，该模型解释了光栅在孔径中的移动，包括理发店旋转柱错觉。它预测了由感知到的真实运动产生的运动后效的方向，以及在理发店旋转柱错觉期间经历的虚幻运动产生的这些后效的方向。在感知层面上，该模型预测运动后效将遵循表观运动的方向，而不是真实方向。四个实验对这一预测进行了检验。在实验1中，在闪烁光线下观察一个螺旋，使其看起来朝着与真实运动相反的方向移动，而后效与表观方向相反。在实验2中，通过一个狭窄的孔径观察螺旋，这样它实际上就相当于一个看起来朝着与真实运动相反方向移动的光栅。同样，运动后效与表观旋转方向而非真实旋转方向相反。在实验3中，使用了一个扇形盘，也得到了类似的结果。在实验4中，对扇形盘进行录像，使其看起来朝着与真实运动相反的方向旋转。对这种“旋转木马”效应的后续运动与它在屏幕上的表观旋转方向相反。在所有实验中，预测都得到了证实，从而证实了运动后效遵循表观而非真实运动方向这一普遍原则。
