Face discrimination is an outstanding example of human perceptual expertise, as it requires discrimination at the individual exemplar level within a highly homogeneous category of stimuli with similar global organization. Yet the ability to recognize a face seems effortless and is normally very efficient. To achieve this level of efficiency, specially-tuned perceptual processes are triggered when physiognomic qualities signal the existence of a face in the visual field. These processes include the analysis of characteristic face features (e.g. shape of the eyes, arc of the nose, etc.) as well as the computation of precise spatial metrics between the features themselves as well as their spatial relations to the outer contour of a face. Combining results reported in the literature with those found during our previous funding period, we propose that in the absence of quick and efficient basic-level categorization of visual stimuli as faces, the additional computations that allow discrimination among individual faces are either not elicited or are elicited disproportionately by face compared to objects. The consequence of such a state is impaired or inefficient face identification and, in extreme cases, """"""""face blindness"""""""", as can be observed in some individuals who never learn to identify faces (often referred to as congenital prosopagnosia or CP). One goal of the proposed experiments is to further explore individual variations in face processing among participants with normal face identification abilities as well as face identification deficits in CP and other face deficient populations. We also propose studies of face perception in selected patients with right hemisphere damage due to stroke for whom local processing can be relatively spared while global organization is impaired. We will continue to collect EEG and behavioral to study the perceptual and neural mechanisms underlying successful face perception. The studies proposed are expected to increase our understanding of the extraordinary human ability of face identification. Importantly, the results also will be useful for the development of training programs that would help to improve this socially important skill (see an example from our own research described in the preliminary studies section of this proposal).

Public Health Relevance

Prosopagnosia is a perceptual condition in which a face can be recognized as a face but cannot be discriminated from other faces despite intact visual, cognitive and other perceptual abilities. It can occur as a result of damage to certain areas of the human brain (acquired prosopagnosia) or as a developmental deficit (congenital prosopagnosia). Given the importance of face recognition skills in normal social discourse, understanding the cognitive and neural mechanisms associated with this ability will lead to greater understanding of how the brain performs this complex perceptual act as well as guide the direction of rehabilitation measures designed to enhance face recognition functions.

National Institute of Health (NIH)
National Institute of Mental Health (NIMH)
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Cognition and Perception Study Section (CP)
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Simmons, Janine M
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University of California Berkeley
Schools of Arts and Sciences
United States
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Flevaris, Anastasia V; Robertson, Lynn C (2016) Spatial frequency selection and integration of global and local information in visual processing: A selective review and tribute to Shlomo Bentin. Neuropsychologia 83:192-200
Golan, Tal; Bentin, Shlomo; DeGutis, Joseph M et al. (2014) Association and dissociation between detection and discrimination of objects of expertise: Evidence from visual search. Atten Percept Psychophys 76:391-406
Sun, Gang; Zhang, Guoping; Yang, Yanjie et al. (2014) Mapping the time course of other-race face classification advantage: a cross-race ERP study. Brain Topogr 27:663-71
Harel, Assaf; Bentin, Shlomo (2013) Are all types of expertise created equal? Car experts use different spatial frequency scales for subordinate categorization of cars and faces. PLoS One 8:e67024
Sun, Gang; Song, Luping; Bentin, Shlomo et al. (2013) Visual search for faces by race: a cross-race study. Vision Res 89:39-46
Gilaie-Dotan, Sharon; Hahamy-Dubossarsky, Avital; Nir, Yuval et al. (2013) Resting state functional connectivity reflects abnormal task-activated patterns in a developmental object agnosic. Neuroimage 70:189-98
Gao, Zaifeng; Goldstein, Abraham; Harpaz, Yuval et al. (2013) A magnetoencephalographic study of face processing: M170, gamma-band oscillations and source localization. Hum Brain Mapp 34:1783-95
Brooks, Joseph L; Gilaie-Dotan, Sharon; Rees, Geraint et al. (2012) Preserved local but disrupted contextual figure-ground influences in an individual with abnormal function of intermediate visual areas. Neuropsychologia 50:1393-407
Daniel, Sharon; Bentin, Shlomo (2012) Age-related changes in processing faces from detection to identification: ERP evidence. Neurobiol Aging 33:206.e1-28
Aviezer, Hillel; Hassin, Ran R; Bentin, Shlomo (2012) Impaired integration of emotional faces and affective body context in a rare case of developmental visual agnosia. Cortex 48:689-700

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