The perceptual capacity of concurrent grouping of colored dots by similarity and by dissimilarity

Sun, Peng; Chubb, Charlie; Wright, Charles E.; Sperling, George

doi:10.1167/18.10.443

Cited by 1 publication

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“…Another concern was that numerosity may have affected performance. Research conducted in our lab suggests that when the tokens of one hue in a stimulus cloud are substantially more numerous than the tokens of any of the types of a set of mixed-hue distractors, participants are able to find the centroid of dots of that more numerous hue with high efficiency and selectivity (Sun, Chubb, Wright, & Sperling, 2018), even when they do not know beforehand what that hue will be. Unlike the top-down effects of selective attention that we have been discussing, this appears to reflect a stimulus-driven (bottom-up) form of selective attention.…”

Section: Discussionmentioning

confidence: 95%

Variation in target and distractor heterogeneity impacts performance in the centroid task

Wright

Chubb

et al. 2019

Journal of Vision

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In a selective centroid task, the participant views a brief cloud of items of different types-some of which are targets, the others distractors-and strives to mouseclick the centroid of the target items, ignoring the distractors. Advantages of the centroid task are that multiple target types can appear in the same display and that influence functions, which estimate the weight of each stimulus type in the cloud on the perceived centroid for each participant, can be obtained easily and efficiently. Here we document the strong, negative impact on performance that results when the participant is instructed to attend to target dots that consist of two or more levels of a single feature dimension, even when those levels differ categorically from those of the distractor dots. The results also show a smaller, but still observable decrement in performance that results when there is heterogeneity in the distractor dots.

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Section: Discussionmentioning

confidence: 95%