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Author Dube, Chad ♦ Zhou, Feng ♦ Sekuler, Robert
Source CiteSeerX
Content type Text
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Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Abstract A task-irrelevant stimulus can distort recall from visual short-term memory. Specifically, the recalled stimulus can take on some of the appearance of an accompanying task-irrelevant stimulus (Huang & Sekuler, 2010a). However, the locus of this robust effect is unknown as it is unclear whether distortion is generated early, during perceptual encoding of target stimuli, or later, during some post-perceptual representation in memory. To select between these two accounts, we manipulated subjects ’ attention to target and non-target stimuli whose similarity relationships were varied parametrically. On each trial, subjects were shown one or two Gabor patches, followed by a probe; their task was to indicate whether the probe matched one of the study items. A brief cue told subjects which Gabor, first or second, would serve as that trial’s target item. Critically, this cue appeared either before, between, or after the study items. False alarm rates varied with the probe’s similarity to a trial’s task-irrelevant study item, confirming that the task-irrelevant item impacted visual encoding of the target. A diffusion model (Ratcliff, 1978; Ratcliff & Smith, 2004) was applied simultaneously to subjects ’ choice probabilities and reaction times. Model fits revealed that both lure similarity and cue timing affect the model’s mean drift rate parameter, which represents the accumulation of sensory information. This
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Publisher Date 2012-01-01