两种参照作用下的视觉定位

本实验采用多点视觉定位作业，研究视觉定位中的两种参照对定位成绩的影响。实验采用一些附加线条与三个刺激形成有特征的刺激图和无特征的刺激图，并与没有附加线条的情况进行了比较。有特征的刺激图是指这些附加的线条与刺激点构成一定的特征，如一个字母或图形等；无特征的刺激图指刺激点不能与附加线条构成有规律的特征。结果发现，当有附加线条的图形呈现时，被试的定位误差大于控制组，表现出一级参照对视觉定位的干扰作用，而且在呈现时间为100ms、200ms、300ms时，都是如此。在有特征组内，不同的特征对定位精确性的影响依赖于时间因素。

VISUAL LOCALIZATION UNDER THE EFFECT OF TWO REFERENCES

This experiment was aimed to examine the effect of the first - order reference (context ) and secondorder references (relationships among target dots) on visual localization. The stimuli in the experimental groups consisted of three dots and some additional lines, which were spatially arranged so that they formed stimu1i with or without a feature. The feature might be a letter or a figure and so on. For the nofeature stimuli, the dots and the additional lines could not form any regular figure, and the stimuli in the control group consisted of only three dots. A microcomputer was used to present the stimuli and record the Ss'response. The brief presentation of an array was followed by a masking, then the Ss were asked to move the mouse cursor to localize all the three dots of the array. We found that when the stimuli included additional lines (both the feature and no - feature group),the average errors of localization for the dots were significantly greater than those of the control group, no mattcr how long the stimuli were presented, 100ms, 200ms or 300ms. The results suggested that the lirst - order refercnce interfercf: with the visual localization task when the two references concurred.