Crowd perception in prosopagnosia

Leib, Allison Yamanashi; Puri, Amrita; Fischer, Jason; Bentin, Shlomo; Whitney, David; Robertson, Lynn C.

doi:10.1016/j.neuropsychologia.2012.03.026

Cited by 60 publications

(70 citation statements)

References 31 publications

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“…It has been shown that when colorful ensembles are presented for a short time (500 ms), observers tend to find the unseen mean hue as familiar as the hues that were present in the original ensemble (Maule et al, 2014), a pattern reminiscent of Ariely's (2001) finding for ensembles of different sizes. This same pattern appears for ensembles of color in a patient with simultagnosia, a condition rendering the patient unable to reliably count more than one or two items (Demeyere et al, 2008), suggesting that the color averaging, as with face averaging in cases of prosopagnosia (Leib et al, 2012), can survive in spite of cognitive deficits limiting the encoding of individual items.…”

Section: Introductionmentioning

confidence: 67%

Effects of ensemble complexity and perceptual similarity on rapid averaging of hue

Maule

Franklin

2015

Journal of Vision

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The ability to extract the mean of features from a rapidly viewed, heterogeneous array of objects has been demonstrated for a number of different visual properties. Few studies have previously investigated the rapid averaging of color; those that did had insufficient stimulus control or inappropriate methods. This study reports three experiments that directly test observers' ability to extract the mean hue from a rapidly presented, multielement color ensemble. In Experiment 1, ensembles varied in number of elements and number of colors. It was found that averaging was harder for ensembles with more colors but that changing the number of elements had no effect on accuracy, supportive of a distributed-attention account of rapid color averaging. Experiment 2a manipulated the hue range present in any single ensemble (varying the perceptual difference between ensemble elements) while still varying the number of colors. Range had a strong effect on ability to pick the mean hue. Experiment 2b found no effect of color categories on the accuracy or speed of mean selection. The results indicate that perceptual difference of elements is the dominant factor affecting ability to average rapidly seen color ensembles. Findings are discussed both in the context of perception and memory of multiple colors and ensemble perception generally.

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Section: Introductionmentioning

confidence: 67%

Effects of ensemble complexity and perceptual similarity on rapid averaging of hue

Maule

Franklin

2015

Journal of Vision

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“…Much behavioral evidence has been accumulated supporting this notion 6,7,11–15,21,99–103, but see 104 , although only a few recent fMRI studies have compared the neural representations of ensemble coding and individual processing 105–107 . Cant and Xu 105,106 showed that PPA and LO were preferentially engaged in texture perception and object processing, respectively; and Huis in’t Veld and de Gelder 107 showed the greater anticipatory and action preparation activity in the areas including IPL, SPL, SFG, and premotor cortex for interactive body movement of a group of panicked people, compared to an unrelated movement of individuals.…”

Section: Discussionmentioning

confidence: 99%

Differential hemispheric and visual stream contributions to ensemble coding of crowd emotion

Albohn

Steiner

et al. 2017

Nat Hum Behav

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In crowds, where scrutinizing individual facial expressions is inefficient, humans can make snap judgments about the prevailing mood by reading “crowd emotion”. We investigated how the brain accomplishes this feat in a set of behavioral and fMRI studies. Participants were asked to either avoid or approach one of two crowds of faces presented in the left and right visual hemifields. Perception of crowd emotion was improved when crowd stimuli contained goal-congruent cues and was highly lateralized to the right hemisphere. The dorsal visual stream was preferentially activated in crowd emotion processing, with activity in the intraparietal sulcus and superior frontal gyrus predicting perceptual accuracy for crowd emotion perception, whereas activity in the fusiform cortex in the ventral stream predicted better perception of individual facial expressions. Our findings thus reveal significant behavioral differences and differential involvement of the hemispheres and the major visual streams in reading crowd versus individual face expressions.

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“…For example, observers can extract the mean size from a set of circles of different sizes seen for 500ms, but are relatively poor at identifying individual members of the set [2]. Sensitivity to summary statistics has been demonstrated in a variety of perceptual domains, including size [e.g., 2, 3-5], orientation [e.g., 6,7], facial expression [e.g., 8,9,10], facial identity [e.g., 10,11,12], and color [e.g., 13,14,15]. Much of this research has focused on whether the mean value of an ensemble has a special perceptual salience.…”

Section: Introductionmentioning

confidence: 99%

Accurate rapid averaging of multihue ensembles is due to a limited capacity subsampling mechanism

Maule

Franklin

2016

J. Opt. Soc. Am. A

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Crowd perception in prosopagnosia

Cited by 60 publications

References 31 publications

Effects of ensemble complexity and perceptual similarity on rapid averaging of hue

Effects of ensemble complexity and perceptual similarity on rapid averaging of hue

Differential hemispheric and visual stream contributions to ensemble coding of crowd emotion

Accurate rapid averaging of multihue ensembles is due to a limited capacity subsampling mechanism

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