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Neurophysiological differentiation between preattentive and attentive processing of emotional expressions on French vowels
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In: ISSN: 0301-0511 ; Biological Psychology ; https://halshs.archives-ouvertes.fr/halshs-01737837 ; Biological Psychology, Elsevier, 2017, pp.55-63 (2017)
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Nature of the P600 in semantically anomalous sentences: Evidence from ERP source localisation
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In: ISSN: 0959-4965 ; NeuroReport ; https://halshs.archives-ouvertes.fr/halshs-01737845 ; NeuroReport, Lippincott, Williams & Wilkins, 2016, 27 (7), pp.548-558 (2016)
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Perceptual and Gaze Biases during Face Processing: Related or Not?
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In: ISSN: 1932-6203 ; EISSN: 1932-6203 ; PLoS ONE ; https://hal.archives-ouvertes.fr/hal-03138599 ; PLoS ONE, Public Library of Science, 2014, 9 (1), pp.e85746. ⟨10.1371/journal.pone.0085746⟩ (2014)
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Perceptual and Gaze Biases during Face Processing: Related or Not?
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Abstract:
Previous studies have demonstrated a left perceptual bias while looking at faces, due to the fact that observers mainly use information from the left side of a face (from the observer's point of view) to perform a judgment task. Such a bias is consistent with the right hemisphere dominance for face processing and has sometimes been linked to a left gaze bias, i.e. more and/or longer fixations on the left side of the face. Here, we recorded eye-movements, in two different experiments during a gender judgment task, using normal and chimeric faces which were presented above, below, right or left to the central fixation point or on it (central position). Participants performed the judgment task by remaining fixated on the fixation point or after executing several saccades (up to three). A left perceptual bias was not systematically found as it depended on the number of allowed saccades and face position. Moreover, the gaze bias clearly depended on the face position as the initial fixation was guided by face position and landed on the closest half-face, toward the center of gravity of the face. The analysis of the subsequent fixations revealed that observers move their eyes from one side to the other. More importantly, no apparent link between gaze and perceptual biases was found here. This implies that we do not look necessarily toward the side of the face that we use to make a gender judgment task. Despite the fact that these results may be limited by the absence of perceptual and gaze biases in some conditions, we emphasized the inter-individual differences observed in terms of perceptual bias, hinting at the importance of performing individual analysis and drawing attention to the influence of the method used to study this bias.
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Keyword:
Research Article
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URL: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3893266
http://www.ncbi.nlm.nih.gov/pubmed/24454927
https://doi.org/10.1371/journal.pone.0085746
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