Involuntary attention and brightness contrast

被引:0
|
作者
William Prinzmetal
Virginia Long
James Leonhardt
机构
[1] University of California,Psychology Department
来源
Perception & Psychophysics | 2008年 / 70卷
关键词
Test Stimulus; High Contrast; Psychometric Function; Standard Stimulus; Location Uncertainty;
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学科分类号
摘要
Carrasco, Ling, and Read (2004) reported that involuntary attention increased perceived contrast. We replicated Carrasco et al. and then tested anaalternative hypothesis: With stimuli near threshold, a peripheral cue biased observers to believe a stimulus had been presented in the cued location. Consistent with this hypothesis, the effect disappeared when we used higher-contrast stimuli. We further tested the guessing-bias hypothesis in three ways: (1) In a detection experiment, the cue affected bias, but did not increase d'; (2) when the cue followed the stimulus, we obtained the same results as when the cue preceded the stimulus; (3) in one experiment, some trials contained no stimulus, yet observers responded that the cued blank stimulus had higher contrast than the uncued blank stimulus. The results suggest that the effects of a noninformative peripheral cue are best described in terms of nonperceptual biases.
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页码:1139 / 1150
页数:11
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