Document Detail

Involuntary attention and brightness contrast.
MedLine Citation:
PMID:  18927000     Owner:  NLM     Status:  MEDLINE    
Carrasco, Ling, and Read (2004) reported that involuntary attention increased perceived contrast. We replicated Carrasco et al. and then tested an alternative 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.
William Prinzmetal; Virginia Long; James Leonhardt
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Perception & psychophysics     Volume:  70     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  2008 Oct 
Date Detail:
Created Date:  2008-10-17     Completed Date:  2008-12-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1139-50     Citation Subset:  IM    
Psychology Department, University of California, Berkeley, CA 94720, USA.
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MeSH Terms
Contrast Sensitivity*
Comment In:
Percept Psychophys. 2008 Oct;70(7):1151-64   [PMID:  18979688 ]

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