Ensemble perception and focused attention: Two different modes of visual processing to cope with limited capacity

Psychonomic Bulletin & Review
Jongsoo Baek, Sang Chul Chong

Abstract

The visual system has a limited capacity for dealing with complex and redundant information in a scene. Here, we propose that a distributed attention mode of processing is necessary for coping with this limit, together with a focused attention mode of processing. The distributed attention mode provides a statistical summary of a scene, whereas the focused attention mode provides relevant information for object recognition. In this paper, we claim that a distributed mode of processing is necessary because (1) averaging performance improves with increased set-sizes, (2) even unselected items are likely to contribute to averaging, and (3) the assumption of variable capacity limits in averaging over different set-sizes is not plausible. We then propose how the averaging process can access multiple items over the capacity limit of focused attention. The visual system can represent multiple items as population responses and read out relevant information using the two modes of attention. It can summarize population responses with a broad application of a Gaussian profile (i.e., distributed attention) and represent its peak as the mean. It can focus on relevant population responses with a narrow application of a Gaussian profile (i.e.,...Continue Reading

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Citations

Oct 10, 2020·Attention, Perception & Psychophysics·Jihong Lee, Sang Chul Chong
Jan 5, 2021·Attention, Perception & Psychophysics·David RosenbaumMarius Usher

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