A LABELED LINES EXPLANATION OF THE PERCEIVED SPATIAL-FREQUENCY OF MODERATE-CONTRAST, NEAR-THRESHOLD-CONTRAST AND ZERO-CONTRAST SPATIAL PATTERNS
A LABELED LINES EXPLANATION OF THE PERCEIVED SPATIAL-FREQUENCY OF MODERATE-CONTRAST, NEAR-THRESHOLD-CONTRAST AND ZERO-CONTRAST SPATIAL PATTERNS
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DOI：
10.1016/0042-6989(94)00198-u
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发表时间：
1995-04-01
期刊：
影响因子：
1.8
通讯作者：
KIRKLAND, BA
中科院分区：
文献类型：
--
作者：
DAVIS, ET;YAGER, D;KIRKLAND, BA
我们测试了多通道模型对空间模式外观的预测。具体来说，我们测试了如何与零对比度或中等对比度模式的编码相比，对近阈值模式的感知空间频率进行编码。例如，该模型预测近阈值模式的平均感知空间频率是对刺激和噪声的响应的加权平均值。六名受试者使用调整程序的方法将外围观察的测试刺激（或空白）与中央凹观察的光栅相匹配。对于接近阈值的模式，我们发现了一个平滑的感知空间频率函数，其感知空间频率范围比 0.16 对比模式所获得的范围更小。这些结果与模型的预测一致：噪声会影响近阈值和零对比度图案的出现。
We tested the predictions of a multiple-channels model about the appearance of spatial patterns. Specifically we tested how encoding the perceived spatial frequency of a near-threshold pattern compared with encoding of a zero-contrast or moderate-contrast pattern. For example, the model predicts that the mean perceived spatial frequency of a near-threshold pattern is a weighted average of the response to the stimulus and the noise. Six subjects used the method of adjustment procedure to match a peripherally viewed test stimulus (or a blank) with a foveally viewed grating. For near-threshold patterns we found a smooth perceived spatial-frequency function, with a smaller range of perceived spatial frequencies than obtained for 0.16 contrast patterns. These results are consistent with the predictions of the model: noise can affect the appearance of near-threshold and zero-contrast patterns.