随机重新校准：情境对感知倾斜的影响。
Stochastic re-calibration: contextual effects on perceived tilt.
作者信息
Solomon Joshua A, Morgan Michael J
机构信息
Department of Optometry and Visual Science, City University, London EC1V 0HB, UK.
出版信息
Proc Biol Sci. 2006 Oct 22;273(1601):2681-6. doi: 10.1098/rspb.2006.3634.
The human visual system exaggerates the difference between the tilts of adjacent lines or grating patches. In addition to this tilt illusion, we found that oblique flanks reduced acuity for small changes of tilt in the centre of the visual field. However, no flanks--regardless of their tilts--decreased sensitivity to contrast. Thus, the foveal tilt illusion should not be attributed to orientation-selective lateral inhibition. Nor is it similar to conventional crowding, which typically does not impair letter recognition in the fovea. Our observers behaved as though the reference orientation (horizontal) had a small tilt in the direction of the flanks. We suggest that the extent of this re-calibration varies randomly over trials, and we demonstrate that this stochastic re-calibration can explain flank-induced acuity loss in the fovea.
人类视觉系统会夸大相邻线条或光栅斑块倾斜度之间的差异。除了这种倾斜错觉外，我们还发现，倾斜的侧翼会降低视野中心小角度倾斜变化的视敏度。然而，无论侧翼的倾斜度如何，无侧翼的情况都不会降低对对比度的敏感度。因此，中央凹倾斜错觉不应归因于方向选择性侧向抑制。它也与传统的拥挤现象不同，传统拥挤现象通常不会损害中央凹处字母的识别。我们的观察者表现得就好像参考方向（水平方向）在侧翼方向上有一个小的倾斜。我们认为，这种重新校准的程度在不同试验中随机变化，并且我们证明这种随机重新校准可以解释中央凹处侧翼诱导的视敏度损失。
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