Scale dependence and channel switching in letter identification.

Scale dependence and channel switching in letter identification.
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DOI:
10.1167/9.9.4
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发表时间:
2009-08-13
期刊:
影响因子:
1.8
通讯作者:
Landy MS
Landy MS
中科院分区:
医学4区
文献类型:
--
作者:
Oruç I;Landy MS

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字母是宽带视觉刺激,具有有助于在广泛的空间频率上辨别的信息。然而,最近的证据表明,观察者只使用一个固定的空间频率通道来识别字母,并且该通道的尺度(以字母大小为单位)由字母的大小决定(尺度依赖)。我们报告了两个使用临界频段掩蔽的字母识别实验。在足够高的幅度、低通或高通掩蔽噪声的情况下,观察者切换到不同的空间频率范围来完成任务。因此,对于给定的字母大小,字母通道不是固定的。当在刺激中加入额外的白噪声掩蔽以平化对比敏感度函数时,观察者所使用的字母通道仍然依赖于字母大小,进一步支持字母识别依赖于尺度的假设。
Letters are broad-band visual stimuli with information useful for discrimination over a wide range of spatial frequencies. Yet, recent evidence suggests that observers use only a single, fixed spatial-frequency channel to identify letters, and that the scale of that channel, in units of letter size, is determined by the size of the letter (scale dependence). We report two letter-identification experiments using critical-band masking. With sufficiently high-amplitude, low- or high-pass masking noise, observers switched to a different range of spatial frequencies for the task. Thus, letter channels are not fixed for a given letter size. When an additional white-noise masker was added to the stimulus to flatten the contrast-sensitivity function, the letter channel used by the observer still depended on letter size, further supporting the hypothesis that letter identification is scale dependent.
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影响因子: 1.9
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