数量化维度特征搜索的影响因素探索

有关数量化维度特征搜索的研究表明 ,目标搜索斜率 (反应时间对呈现项目数量函数的斜率 )是由目标与干扰子之间的差异决定的 ,然而以往研究中其差异的值取决于具体的实验条件。根据韦伯定律 ,笔者推测 ,目标搜索斜率应由目标与干扰子之间的相对差异 (C)决定 ,C为目标值 (T)与干扰子值 (D)的差值与该干扰子值的比值。当C值对应相等时 ,不同几何形状刺激的目标搜索斜率应无差异。为此笔者分别采用圆 (实验一 )和三角形 (实验二 )进行实验研究。实验结果支持了上述假设 ,并发现目标大于干扰子时的目标搜索斜率对C值的函数是单调递减函数

A STUDY ON FACTORS INFLUENCING FEATURE SEARCH ON QUANTITATIVE DIMENSION

According to some previous studies, slope (a function of reaction time to set size) was decided by the difference between a target and the distractors on feature search of quantitative dimension. However, the difference was confined to specific experimental situations. A hypothesis was that slope was decided by the ratio ( C ) of the difference between a target value ( T) and the distractor values ( D ) to the distractor values according to Weber's law. Slopes between stimuli of different geometrical shapes were not significantly different when corresponding C values were equal. Therefore, circles and triangles were used as stimuli in experiments 1 and 2 respectively. Results supported the above hypothesis. Moreover, a function of slopes to C values was a monotonic decreasing function when target values were bigger than distractor values.