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Relative spatial frequency tuning and its contrast dependency in human perception

机译:相对空间频率调谐及其在人类感知中的对比度依赖性

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Several physiological studies in cats and monkeys have reported that the spatial frequency (SF) tuning of visual neurons varies depending on the luminance contrast and size of stimulus. However, comparatively little is known about the effect of changing the stimulus contrast and size on SF tuning in human perception. In the present study, we investigated the effects of stimulus size and luminance contrast on human SF tuning using the subspace-reverse-correlation method. Measuring SF tunings at six different stimulus sizes and three different luminance contrast conditions (90%, 10%, and 1%), we found that human perception exhibits significant stimulus-size-dependent SF tunings. At 90% and 10% contrast, participants exhibited relative SF tuning (cycles/image) rather than absolute SF tuning (cycles/?°) at response peak latency. On the other hand, at 1% contrast, the magnitude of the size-dependent-peak SF shift was too small for strictly relative SF tuning. These results show that human SF tuning is not fixed, but varies depending on the stimulus size and contrast. This dependency may contribute to size-invariant object recognition within an appropriate contrast rage.
机译:在猫和猴子中进行的几项生理研究已报告,视觉神经元的空间频率(SF)调整根据亮度对比和刺激大小而变化。然而,关于刺激对比度和大小改变对人类感知中的SF调整的影响知之甚少。在本研究中,我们使用子空间反相关方法研究了刺激大小和亮度对比度对人的SF调谐的影响。在六种不同的刺激大小和三种不同的亮度对比条件(90%,10%和1%)下测量SF调整,我们发现人类感知表现出显着的刺激尺寸依赖性SF调整。在90%和10%的对比度下,参与者在响应峰值潜伏期表现出相对SF调整(周期/图像),而不是绝对SF调整(周期/?°)。另一方面,在1%的对比度下,大小相关峰SF偏移的大小对于严格相对SF调整而言太小。这些结果表明,人的SF调整不是固定的,而是根据刺激大小和对比度而变化。在适当的对比度范围内,这种依赖性可能有助于大小不变的对象识别。

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