Corwin T R, Zamansky H S
J Exp Psychol Hum Percept Perform. 1976 May;2(2):162-6. doi: 10.1037//0096-1523.2.2.162.
Visual noise masks, composed of letter fragments scattered randomly over the visual field, disrupt the recognition of briefly viewed words when presented immediately before and/or after these words. According to the widely held feature-similarity assumption, maximal disruption is predicted when the mask's letter fragments are equal in size and shape to the target letters. This assumption is not supported by the present experiment, which measured the masking effectiveness of visual noise patterns varying in texture (achieved by photographic reduction or enlargement). For target letters with stroke widths subtending 7.4' or less, the optimally disruptive mask did not vary with the stroke width of the target letters, but rather, was invariably composed of letter fragments with stroke widths subtending about 7'. For larger target words, however, this mask was not optimally disruptive. These results suggest that recognition of letters less that about 7' is mediated by a single size-tuned mechanism.
视觉噪声掩蔽物由随机散布在视野中的字母片段组成，当在这些单词之前和/或之后立即呈现时，会干扰对短暂呈现单词的识别。根据广泛认可的特征相似性假设，当掩蔽物的字母片段在大小和形状上与目标字母相等时，预计会产生最大干扰。本实验不支持这一假设，该实验测量了纹理不同（通过摄影缩小或放大实现）的视觉噪声模式的掩蔽效果。对于笔画宽度所对视角为7.4分或更小的目标字母，最佳干扰掩蔽物并不随目标字母的笔画宽度而变化，而是始终由笔画宽度所对视角约为7分的字母片段组成。然而，对于较大的目标单词，这种掩蔽物并非具有最佳干扰效果。这些结果表明，对约7分以下字母的识别是由单一的大小调谐机制介导的。
