Pagano Christopher C, Isenhower Robert W
Department of Psychology, Clemson University, Clemson, South Carolina 29634-1355, USA.
Psychon Bull Rev. 2008 Apr;15(2):437-42. doi: 10.3758/pbr.15.2.437.
Two response measures for reporting visually perceived egocentric distances-verbal judgments and blind manual reaches-were compared using a within-trial methodology. The expected range of possible target distances was manipulated by instructing the subjects that the targets would be between .50 and 1.00 of their maximum arm reach in one session and between .25 and .90 in another session. The actual range of target distances was always .50-.90. Verbal responses varied as a function of the range of expected distances, whereas simultaneous reaches remained unaffected. These results suggest that verbal responses are subject to a cognitive influence that does not affect actions. It is suggested that action responses are indicative of absolute perception, whereas cognitive responses may reflect only relative perception. The results also indicate that the dependant variable utilized for the study of depth perception will influence the obtained results.
使用试验内方法比较了用于报告视觉感知的自我中心距离的两种反应测量方法——言语判断和盲目手动够取。通过告知受试者目标将在一次试验中处于其最大手臂伸展范围的0.50至1.00之间，而在另一次试验中处于0.25至0.90之间，来操纵可能的目标距离的预期范围。目标距离的实际范围始终为0.50 - 0.90。言语反应随预期距离范围而变化，而同时进行的够取动作则不受影响。这些结果表明，言语反应受到一种不影响动作的认知影响。有人提出，动作反应表明绝对感知，而认知反应可能仅反映相对感知。结果还表明，用于深度感知研究的因变量将影响所获得的结果。
