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Virginia Liu, Jason Forte, Luca Cocchi, David Sewell, Olivia Carter; Cognitive load modulates early visual perceptual processing. Journal of Vision 2014;14(10):535. doi: 10.1167/14.10.535.
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© ARVO (1962-2015); The Authors (2016-present)
In the current dual-task literature, it seems accepted that cognitive load does not affect early perceptual processing but this issue has not been systematically evaluated. Recent studies show that when observers held information in working memory, performance on an unrelated visual perceptual task (i.e., grouping-by-proximity) was improved (increased accuracy and reduced reaction time)(Cocchi et al, 2011). Thus, cognitive control mechanisms supporting working memory may modulate concurrent but independent visual perceptual processing. Four experiments were conducted to further explore the nature of cognitive load modulation on early visual processing. In experiment 1, a contrast detection task was employed to explore whether contrast sensitivity varies under different cognitive loads. Participants judged the orientation of a small Gabor of various contrasts located in parafovea. In experiment 2 to 4, three tasks that are thought to elicit surround-suppression i.e., a motion discrimination task (Tadin et al., 2003), the Chubb illusion and a contrast detection task under surround suppression in periphery (Petrov & Mackee, 2006) were employed to investigate whether cognitive load modulates surround suppression. In all experiments, the perceptual tasks were performed during a concurrent no-, low- and high-working memory load task. Results of experiment 1 show that under high cognitive load, there is a rightward shift of the psychometric function suggesting cognitive load influences early visual processing. No effects of cognitive load on surround inhibition were found in experiments 2 to 4. According to the contrast-normalization model, the balance between excitation and suppression determines contrast response. The results of this study suggest that under high cognitive load excitatory drive is diminished whereas surround suppression remains unchanged. Taken together, cognitive load effects do penetrate to the early visual perceptual processing stage, however, these effects appear limited to excitatory responses.
Meeting abstract presented at VSS 2014
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