Araragi Yukyu, Ito Hiroyuki, Sunaga Shoji
Faculty of Health and Social Welfare Science, Nishikyushu University, Japan.
Spat Vis. 2009;22(4):339-53. doi: 10.1163/156856809788746273.
Two experiments examined whether filling-in occurred at the blind spot when a line segment was presented on only one side of the blind spot. We used static and dynamic stimuli: a static test line segment and a pair of probe line segments were presented in Experiment 1 and a moving test line segment was presented in Experiment 2. We compared the probability that the proximal end was perceived to be on the blind spot side when the test line segment came into contact with the blind spot (blind spot condition) with that when the test line segment was outside the blind spot (control condition). The results of the two experiments showed that the proximal end was perceived to be more on the blind spot side in the blind spot condition than in the control condition. Notably, when a dynamic stimulus was presented below the blind spot, the mean amount of filling-in reached 2.84 degrees. Therefore, filling-in occurred at the blind spot even when a line segment was presented on only one side of the blind spot.
两项实验探究了当一条线段仅呈现在盲点的一侧时，盲点处是否会发生填补现象。我们使用了静态和动态刺激：实验1中呈现了一条静态测试线段和一对探测线段，实验2中呈现了一条移动的测试线段。我们比较了测试线段与盲点接触时（盲点条件）近端被感知为在盲点一侧的概率，以及测试线段在盲点之外时（对照条件）近端被感知为在盲点一侧的概率。两项实验的结果表明，与对照条件相比，在盲点条件下近端被感知为更靠近盲点一侧。值得注意的是，当在盲点下方呈现动态刺激时，平均填补量达到了2.84度。因此，即使一条线段仅呈现在盲点的一侧，盲点处也会发生填补现象。
