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Mejía, Manuel Alejandro; Valdés-Sosa, Mitchell; Bobes, Maria Antonieta
Consciousness and cognition, August 2024, 2024-08-00, 20240801, Letnik: 123Journal Article
•Pupil response and judgments about faces/houses measured in neurotypical subjects.•Pupil responses were larger for familiar faces relative to unfamiliar faces.•Strong interocular suppression blocked overt familiar face and house recognition.•Neither face/house discrimination nor pupil familiarity response were affected.•These results provide a model for covert face recognition in prosopagnosia. In prosopagnosia, brain lesions impair overt face recognition, but not face detection, and may coexist with residual covert recognition of familiar faces. Previous studies that simulated covert recognition in healthy individuals have impaired face detection as well as recognition, thus not fully mirroring the deficits in prosopagnosia. We evaluated a model of covert recognition based on continuous flash suppression (CFS). Familiar and unfamiliar faces and houses were masked while participants performed two discrimination tasks. With increased suppression, face/house discrimination remained largely intact, but face familiarity discrimination deteriorated. Covert recognition was present across all masking levels, evinced by higher pupil dilation to familiar than unfamiliar faces. Pupil dilation was uncorrelated with overt performance across subjects. Thus, CFS can impede overt face recognition without disrupting covert recognition and face detection, mirroring critical features of prosopagnosia. CFS could be used to uncover shared neural mechanisms of covert recognition in prosopagnosic patients and neurotypicals.
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