In the tilt illusion, the orientation of a central stimulus appears tilted away from a surrounding stimulus when angular difference is between 0 deg and 50 deg. Studies have repeatedly shown that the tilt illusion exhibits the strongest effect with the angular difference around 15 deg and this angular tuning is robust to various changes in stimulus parameters. We revisited the well-reported angular tuning of the tilt illusion, in relation to the recently-reported modulation of illusion magnitude by stimulus duration. We examined the tilt illusion with a wide range of stimulus duration (10-640 ms) and angular difference (7.5-75.0 deg). The results confirmed that the peak magnitude of the tilt illusion increased with shorter durations. However, we also found that the position of the peak shifted to larger angular differences with shorter durations. Evidently, the angular tuning profile of the tilt illusion is not fixed but can change with stimulus duration. The peak shift may be explained if orientation-selective lateral inhibition responsible for the tilt illusion sharpens its tuning over time.

中文翻译：

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倾斜错觉的角度调整取决于刺激持续时间。

在倾斜错觉中，当角度差在 0 度和 50 度之间时，中央刺激的方向似乎与周围刺激倾斜。研究一再表明，倾斜错觉在 15 度左右的角度差时表现出最强的效果，并且这种角度调整对刺激参数的各种变化具有鲁棒性。我们重新审视了充分报道的倾斜错觉的角度调整，这与最近报道的刺激持续时间对错觉幅度的调制有关。我们检查了具有广泛刺激持续时间 (10-640 ms) 和角差 (7.5-75.0 度) 的倾斜错觉。结果证实，倾斜错觉的峰值幅度随着持续时间的缩短而增加。然而，我们还发现峰值的位置移动到更大的角度差异，持续时间更短。显然，倾斜错觉的角度调谐轮廓不是固定的，而是会随着刺激持续时间而变化。如果导致倾斜错觉的方向选择性侧向抑制随着时间的推移锐化其调谐，则可以解释峰值偏移。