The Experts below are selected from a list of 126 Experts worldwide ranked by ideXlab platform
Bruno Rossion - One of the best experts on this subject based on the ideXlab platform.
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The neural basis of rapid Unfamiliar face individuation with human intracerebral recordings
NeuroImage, 2020Co-Authors: Corentin Jacques, Bruno Rossion, Angélique Volfart, Hélène Brissart, Sophie Colnat-coulbois, Louis Maillard, Jacques JonasAbstract:Rapid individuation of conspecifics' faces is ecologically important in the human species, whether the face belongs to a familiar or Unfamiliar Individual. Here we tested a large group (N = 69) of epileptic patients implanted with intracerebral electrodes throughout the ventral occipito-temporal cortex (VOTC). We used a frequency-tagging visual stimulation paradigm optimized to objectively measure face individuation with direct neural recordings. This enabled providing an extensive map of the significantly larger neural responses to upright than to inverted Unfamiliar faces, i.e. reflecting visual face individuation processes that go beyond physical image differences. These high-level face individuation responses are both distributed and anatomically confined to a strip of cortex running from the inferior occipital gyrus all along the lateral fusiform gyrus, with a large right hemispheric dominance. Importantly, face individuation responses are limited anteriorly to the bilateral anterior fusiform gyrus and surrounding sulci, with a near absence of significant responses in the extensively sampled temporal pole. This large-scale mapping provides original evidence that face individuation is supported by a distributed yet anatomically constrained population of neurons in the human VOTC, and highlights the importance of probing this function with face stimuli devoid of associated semantic, verbal and affective information.
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High test-retest reliability of a neural index of rapid automatic discrimination of Unfamiliar Individual faces
Visual Cognition, 2019Co-Authors: Milena Dzhelyova, Corentin Jacques, Giulia Dormal, Caroline Michel, Christine Schiltz, Bruno RossionAbstract:An important aspect of human Individual face recognition is the ability to discriminate Unfamiliar Individual. Since many general processes contribute to explicit behavioural performance in Individual face discrimination tasks, isolating a measure of Unfamiliar Individual face discrimination ability in humans is challenging. In recent years, a fast periodic visual stimulation approach (FPVS) has provided objective (frequency-locked) implicit electrophysiological indices of Individual face discrimination that are highly sensitive at the Individual level within a few minutes of testing. Here we evaluate the test-retest reliability of this response across scalp electroencephalographic (EEG) recording sessions separated by more than two months, in the same 30 Individuals. We found no test-retest difference overall across sessions in terms of amplitude and spatial distribution of the EEG Individual face discrimination response. Moreover, with only 4 stimulation sequences corresponding to 4 min of recordings per session, the Individual face discrimination response was highly reliable in terms of amplitude, spatial distribution, and shape. Together with previous observations, these results strengthen the diagnostic value of FPVS-EEG as an objective and rapid flag for specific difficulties at Individual face recognition in the human population.
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Typical Unfamiliar face discrimination ability in anterior temporal lobe epilepsy
2019Co-Authors: Angélique Volfart, Bruno Rossion, Louis Maillard, Jacques Jonas, Hélène BrissartAbstract:Compared to patients with prosopagnosia, other animal species, infants or children, neurotypical human adults are experts at individuating pictures of Unfamiliar faces, but the neural basis of this function remains largely unknown. Since an increasing number of studies rely on intracranial recordings in anterior temporal epileptic patients (aTLE) to investigate the neural mechanisms of face recognition, it is important to assess aTLE patients’ ability to discriminate and match Unfamiliar Individual faces. Here, we tested 42 patients with left (n=17) or right (n=25) aTLE, and 42 healthy matched controls. Seven computerized neuropsychological tests were administered: the Benton Face Recognition Test (BFRT), the Cambridge Face Memory Test (CFMT), delayed matching of upright pictures of faces and objects, the Mooney Face Test, famous face recognition and naming, Unfamiliar face and object learning. Relative to controls, we found that (1) both left and right aTLE patients were impaired (−10.5% and −8.2% in accuracy, respectively) in learning Unfamiliar faces, but without any specificity (i.e. impairment also for nonface objects); (2) on average, right aTLE patients had significantly slower response times at all tasks, but this included the WAIS’ Code subtest assessing processing speed, showing that this effect is not specific to visual tasks and (3) importantly, there was no difference between aTLE patients and matched controls on all the tasks assessing Individual face discrimination (mean BFRT scores at 42.3/54 and 42.6/54 and CFMT scores at 47.2/72 and 47.1/72 for left and right aTLE respectively, significant inversion effect for matching Individual faces but not cars). Overall, our study shows that left and right aTLE patients do not differ quantitatively and qualitatively at Unfamiliar face discrimination tasks relative to healthy controls.
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High test-retest reliability of a neural index of rapid automatic discrimination of Unfamiliar Individual faces
Visual Cognition, 2019Co-Authors: Milena Dzhelyova, Corentin Jacques, Giulia Dormal, Caroline Michel, Christine Schiltz, Bruno RossionAbstract:International audienceAn important aspect of human Individual face recognition is the ability to discriminate Unfamiliar Individual. Since many general processes contribute to explicit behavioural performance in Individual face discrimination tasks, isolating a measure of Unfamiliar Individual face discrimination ability in humans is challenging. In recent years, a fast periodic visual stimulation approach (FPVS) has provided objective (frequency-locked) implicit electrophysiological indices of Individual face discrimination that are highly sensitive at the Individual level within a few minutes of testing. Here we evaluate the test-retest reliability of this response across scalp electroencephalographic (EEG) recording sessions separated by more than two months, in the same 30 Individuals. We found no test-retest difference overall across sessions in terms of amplitude and spatial distribution of the EEG Individual face discrimination response. Moreover, with only 4 stimulation sequences corresponding to 4 min of recordings per session, the Individual face discrimination response was highly reliable in terms of amplitude, spatial distribution, and shape. Together with previous observations, these results strengthen the diagnostic value of FPVS-EEG as an objective and rapid flag for specific difficulties at Individual face recognition in the human population
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Impaired holistic processing of Unfamiliar Individual faces in acquired prosopagnosia.
Neuropsychologia, 2009Co-Authors: Meike Ramon, Thomas Busigny, Bruno RossionAbstract:Prosopagnosia is an impairment at Individualizing faces that classically follows brain damage. Several studies have reported observations supporting an impairment of holistic/configural face processing in acquired prosopagnosia. However, this issue may require more compelling evidence as the cases reported were generally patients suffering from integrative visual agnosia, and the sensitivity of the paradigms used to measure holistic/configural face processing in normal Individuals remains unclear. Here we tested a well-characterized case of acquired prosopagnosia (PS) with no object recognition impairment, in five behavioral experiments (whole/part and composite face paradigms with Unfamiliar faces). In all experiments, for normal observers we found that processing of a given facial feature was affected by the location and identity of the other features in a whole face configuration. In contrast, the patient's results over these experiments indicate that she encodes local facial information independently of the other features embedded in the whole facial context. These observations and a survey of the literature indicate that abnormal holistic processing of the Individual face may be a characteristic hallmark of prosopagnosia following brain damage, perhaps with various degrees of severity.
Corentin Jacques - One of the best experts on this subject based on the ideXlab platform.
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The neural basis of rapid Unfamiliar face individuation with human intracerebral recordings
NeuroImage, 2020Co-Authors: Corentin Jacques, Bruno Rossion, Angélique Volfart, Hélène Brissart, Sophie Colnat-coulbois, Louis Maillard, Jacques JonasAbstract:Rapid individuation of conspecifics' faces is ecologically important in the human species, whether the face belongs to a familiar or Unfamiliar Individual. Here we tested a large group (N = 69) of epileptic patients implanted with intracerebral electrodes throughout the ventral occipito-temporal cortex (VOTC). We used a frequency-tagging visual stimulation paradigm optimized to objectively measure face individuation with direct neural recordings. This enabled providing an extensive map of the significantly larger neural responses to upright than to inverted Unfamiliar faces, i.e. reflecting visual face individuation processes that go beyond physical image differences. These high-level face individuation responses are both distributed and anatomically confined to a strip of cortex running from the inferior occipital gyrus all along the lateral fusiform gyrus, with a large right hemispheric dominance. Importantly, face individuation responses are limited anteriorly to the bilateral anterior fusiform gyrus and surrounding sulci, with a near absence of significant responses in the extensively sampled temporal pole. This large-scale mapping provides original evidence that face individuation is supported by a distributed yet anatomically constrained population of neurons in the human VOTC, and highlights the importance of probing this function with face stimuli devoid of associated semantic, verbal and affective information.
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High test-retest reliability of a neural index of rapid automatic discrimination of Unfamiliar Individual faces
Visual Cognition, 2019Co-Authors: Milena Dzhelyova, Corentin Jacques, Giulia Dormal, Caroline Michel, Christine Schiltz, Bruno RossionAbstract:An important aspect of human Individual face recognition is the ability to discriminate Unfamiliar Individual. Since many general processes contribute to explicit behavioural performance in Individual face discrimination tasks, isolating a measure of Unfamiliar Individual face discrimination ability in humans is challenging. In recent years, a fast periodic visual stimulation approach (FPVS) has provided objective (frequency-locked) implicit electrophysiological indices of Individual face discrimination that are highly sensitive at the Individual level within a few minutes of testing. Here we evaluate the test-retest reliability of this response across scalp electroencephalographic (EEG) recording sessions separated by more than two months, in the same 30 Individuals. We found no test-retest difference overall across sessions in terms of amplitude and spatial distribution of the EEG Individual face discrimination response. Moreover, with only 4 stimulation sequences corresponding to 4 min of recordings per session, the Individual face discrimination response was highly reliable in terms of amplitude, spatial distribution, and shape. Together with previous observations, these results strengthen the diagnostic value of FPVS-EEG as an objective and rapid flag for specific difficulties at Individual face recognition in the human population.
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High test-retest reliability of a neural index of rapid automatic discrimination of Unfamiliar Individual faces
Visual Cognition, 2019Co-Authors: Milena Dzhelyova, Corentin Jacques, Giulia Dormal, Caroline Michel, Christine Schiltz, Bruno RossionAbstract:International audienceAn important aspect of human Individual face recognition is the ability to discriminate Unfamiliar Individual. Since many general processes contribute to explicit behavioural performance in Individual face discrimination tasks, isolating a measure of Unfamiliar Individual face discrimination ability in humans is challenging. In recent years, a fast periodic visual stimulation approach (FPVS) has provided objective (frequency-locked) implicit electrophysiological indices of Individual face discrimination that are highly sensitive at the Individual level within a few minutes of testing. Here we evaluate the test-retest reliability of this response across scalp electroencephalographic (EEG) recording sessions separated by more than two months, in the same 30 Individuals. We found no test-retest difference overall across sessions in terms of amplitude and spatial distribution of the EEG Individual face discrimination response. Moreover, with only 4 stimulation sequences corresponding to 4 min of recordings per session, the Individual face discrimination response was highly reliable in terms of amplitude, spatial distribution, and shape. Together with previous observations, these results strengthen the diagnostic value of FPVS-EEG as an objective and rapid flag for specific difficulties at Individual face recognition in the human population
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early adaptation to repeated Unfamiliar faces across viewpoint changes in the right hemisphere evidence from the n170 erp component
Neuropsychologia, 2009Co-Authors: Stephanie Caharel, Corentin Jacques, Meike Ramon, Olivier Darripe, Bruno RossionAbstract:Event-related potential (ERP) studies have shown that sensitivity to Individual faces emerges as early as approximately 160ms in the human occipitotemporal cortex (N170). Here we tested whether this effect generalizes across changes in viewpoint. We recorded ERPs during an Unfamiliar Individual face adaptation paradigm. Participants were presented first with an adapting face ( approximately 3000ms) rotated 30 degrees in depth, followed by a second face (200ms) in a frontal view of either the same or a different identity. The N170 amplitude at right occipitotemporal sites to the second stimulus was reduced for repeated as compared to different faces. A bilateral adaptation effect emerged after 250ms following stimulus onset. These observations indicate that Individual face representations activated as early as 160ms after stimulus onset in the right hemisphere show a substantial degree of generalization across viewpoints.
Martine Hausberger - One of the best experts on this subject based on the ideXlab platform.
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lateralization of social signal brain processing correlates with the degree of social integration in a songbird
Scientific Reports, 2020Co-Authors: Hugo Cousillas, Laurence Henry, Isabelle George, Schedir Marchesseau, Martine HausbergerAbstract:Group cohesion relies on the ability of its members to process social signals. Songbirds provide a unique model to investigate links between group functioning and brain processing of social acoustic signals. In the present study, we performed both behavioral observations of social relationships within a group of starlings and Individual electrophysiological recordings of HVC neuronal activity during the broadcast of either familiar or Unfamiliar Individual songs. This allowed us to evaluate and compare preferred partnerships and Individual electrophysiological profiles. The electrophysiological results revealed asymmetric neuronal activity in the HVC and higher responsiveness to familiar than to Unfamiliar songs. However, most importantly, we found a correlation between strength of cerebral asymmetry and social integration in the group: the more preferred partners a bird had, the more its HVC neuronal activity was lateralized. Laterality is likely to give advantages in terms of survival. Our results suggest that these include social skill advantages. Better knowledge of links between social integration and lateralization of social signal processing should help understand why and how lateralization has evolved.
Milena Dzhelyova - One of the best experts on this subject based on the ideXlab platform.
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High test-retest reliability of a neural index of rapid automatic discrimination of Unfamiliar Individual faces
Visual Cognition, 2019Co-Authors: Milena Dzhelyova, Corentin Jacques, Giulia Dormal, Caroline Michel, Christine Schiltz, Bruno RossionAbstract:An important aspect of human Individual face recognition is the ability to discriminate Unfamiliar Individual. Since many general processes contribute to explicit behavioural performance in Individual face discrimination tasks, isolating a measure of Unfamiliar Individual face discrimination ability in humans is challenging. In recent years, a fast periodic visual stimulation approach (FPVS) has provided objective (frequency-locked) implicit electrophysiological indices of Individual face discrimination that are highly sensitive at the Individual level within a few minutes of testing. Here we evaluate the test-retest reliability of this response across scalp electroencephalographic (EEG) recording sessions separated by more than two months, in the same 30 Individuals. We found no test-retest difference overall across sessions in terms of amplitude and spatial distribution of the EEG Individual face discrimination response. Moreover, with only 4 stimulation sequences corresponding to 4 min of recordings per session, the Individual face discrimination response was highly reliable in terms of amplitude, spatial distribution, and shape. Together with previous observations, these results strengthen the diagnostic value of FPVS-EEG as an objective and rapid flag for specific difficulties at Individual face recognition in the human population.
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High test-retest reliability of a neural index of rapid automatic discrimination of Unfamiliar Individual faces
Visual Cognition, 2019Co-Authors: Milena Dzhelyova, Corentin Jacques, Giulia Dormal, Caroline Michel, Christine Schiltz, Bruno RossionAbstract:International audienceAn important aspect of human Individual face recognition is the ability to discriminate Unfamiliar Individual. Since many general processes contribute to explicit behavioural performance in Individual face discrimination tasks, isolating a measure of Unfamiliar Individual face discrimination ability in humans is challenging. In recent years, a fast periodic visual stimulation approach (FPVS) has provided objective (frequency-locked) implicit electrophysiological indices of Individual face discrimination that are highly sensitive at the Individual level within a few minutes of testing. Here we evaluate the test-retest reliability of this response across scalp electroencephalographic (EEG) recording sessions separated by more than two months, in the same 30 Individuals. We found no test-retest difference overall across sessions in terms of amplitude and spatial distribution of the EEG Individual face discrimination response. Moreover, with only 4 stimulation sequences corresponding to 4 min of recordings per session, the Individual face discrimination response was highly reliable in terms of amplitude, spatial distribution, and shape. Together with previous observations, these results strengthen the diagnostic value of FPVS-EEG as an objective and rapid flag for specific difficulties at Individual face recognition in the human population
Thierry Aubin - One of the best experts on this subject based on the ideXlab platform.
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Does true syntax or simple auditory object support the role of skylark song dialect ?
Animal Behaviour, 2013Co-Authors: Elodie Briefer, Fanny Rybak, Thierry AubinAbstract:Parallels between birdsong and human language are numerous and include particular temporal arrangements of acoustic units and the existence of dialects. In animal communication, modifications of the temporal ordering of existing acoustic units have rarely been clearly linked with changes in information content, particularly in a natural environment. Here, we show that the organization of birdsong units (‘syllables’) in sequences supports interIndividual relationships within skylark communities. We manipulated the temporal arrangement of song dialect variants (‘shared phrases’) in the skylark, Alauda arvensis, a songbird with a very large repertoire of syllables and complex song. When tested with playback experiments performed in the field, skylarks were able to perceive subtle differences in the ordering of syllables. Modifications of the syllable ordering within shared phrases changed the information content from ‘group member’ to ‘Unfamiliar Individual’ and induced more aggressive reactions than shared phrases with a preserved syllable arrangement. Shared phrases often varied between Individuals in the number of successive repetitions of similar syllable types, but were very consistent in terms of syllable type ordering. Our results indicate that skylarks rely not simply on the composition in syllable types of shared phrases to recognize group members, but on syllable type ordering. Shared phrases could be perceived by birds as ‘auditory objects’ embedded within songs. Alternatively, birds might identify incorrect phrases using grammatical rules governing the succession of syllables composing the phrases shared by their group. The presence of between-Individual variation in phrase length, associated with consistent syllable type ordering revealed by our analysis, suggests that the latter hypothesis is more likely. Our results show that birds perceive disruptions in the natural temporal pattern of song units, and that this temporal pattern is behaviourally salient and carries information.
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The role of shared phrases in skylark song : true syntax or simple auditory object ?
Animal Behaviour, 2013Co-Authors: Elodie Briefer, Fanny Rybak, Thierry AubinAbstract:Parallels between birdsong and human language are numerous and include particular temporal arrangements of acoustic units and the existence of dialects. In animal communication, modifications of the temporal ordering of existing acoustic units have rarely been clearly linked with changes in information content, particularly in a natural environment. Here, we show that the organization of birdsong units (‘syllables’) in sequences supports interIndividual relationships within skylark communities. We manipulated the temporal arrangement of song dialect variants (‘shared phrases’) in the skylark, Alaudaarvensis, a songbird with a very large repertoire of syllables and complex song. When tested with playback experiments performed in the field, skylarks were able to perceive subtle differences in the ordering of syllables. Modifications of the syllable ordering within shared phrases changed the information content from ‘group member’ to ‘Unfamiliar Individual’ and induced more aggressive reactions than shared phrases with a preserved syllable arrangement. Shared phrases often varied between Individuals in the number of successive repetitions of similar syllable types, but were very consistent in terms of syllable type ordering. Our results indicate that skylarks rely not simply on the composition in syllable types of shared phrases to recognize group members, but on syllable type ordering. Shared phrases could be perceived by birds as ‘auditory objects’ embedded within songs. Alternatively, birds might identify incorrect phrases using grammatical rules governing the succession of syllables composing the phrases shared by their group. The presence of between-Individual variation in phrase length, associated with consistent syllable type ordering revealed by our analysis, suggests that the latter hypothesis is more likely. Our results show that birds perceive disruptions in the natural temporal pattern of song units, and that this temporal pattern is behaviourally salient and carries information.
