Pre-exposure to moving form enhances static form sensitivity.
Pre-exposure to moving form enhances static form sensitivity.
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DOI：
10.1371/journal.pone.0008324
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发表时间：
2009-12-17
期刊：
影响因子：
3.7
通讯作者：
Arnold DH
中科院分区：
文献类型：
--
作者：
Wallis TS;Williams MA;Arnold DH
运动定义的形式似乎在运动停止后短暂地持续存在，然后似乎逐渐消失在背景中。在这里，我们研究这种主观持久性是否反映了能够改善对静态形式敏感性的客观测量的信号。我们提出了亮度的正弦调制，由背景噪声模式掩盖。正弦亮度调制在静态时通常主观上不可见，但在移动时可见。我们发现，波形漂移然后停止会导致静态显示中波形出现短暂的主观持久性。与在匹配的持续时间内查看静态波形相比，在查看移动波形后，观察者对静态波形位置的客观敏感度也得到了提高。这种促进作用的发生不仅仅是因为运动提供了更多的波形视角，因为预暴露于混乱动画之后的性能与预暴露于平滑运动之后的性能不匹配。观察者并不是简单地记住运动偏移处的波形位置，因为在测试之前删除波形会降低性能。因此，运动处理与后续的静态视觉输入进行交互，从而可以提高客观灵敏度测量的性能。我们认为，运动偏移后可能发生的运动定义形式的短暂主观持续是由运动处理暂时增强的静态形式信号衰减的结果。
Motion-defined form can seem to persist briefly after motion ceases, before seeming to gradually disappear into the background. Here we investigate if this subjective persistence reflects a signal capable of improving objective measures of sensitivity to static form. We presented a sinusoidal modulation of luminance, masked by a background noise pattern. The sinusoidal luminance modulation was usually subjectively invisible when static, but visible when moving. We found that drifting then stopping the waveform resulted in a transient subjective persistence of the waveform in the static display. Observers' objective sensitivity to the position of the static waveform was also improved after viewing moving waveforms, compared to viewing static waveforms for a matched duration. This facilitation did not occur simply because movement provided more perspectives of the waveform, since performance following pre-exposure to scrambled animations did not match that following pre-exposure to smooth motion. Observers did not simply remember waveform positions at motion offset, since removing the waveform before testing reduced performance. Motion processing therefore interacts with subsequent static visual inputs in a way that can improve performance in objective sensitivity measures. We suggest that the brief subjective persistence of motion-defined forms that can occur after motion offsets is a consequence of the decay of a static form signal that has been transiently enhanced by motion processing.
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