Arnaud Leleu

Arnaud Leleu
University of Burgundy | UB · Centre des Sciences du Goût et de l’Alimentation (CSGA)

PhD in Psychology & Neuroscience
Interested in the development of (multi)sensory perception from infancy to adulthood with an emphasis on olfaction

About

56
Publications
12,605
Reads
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498
Citations
Citations since 2016
35 Research Items
447 Citations
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2016201720182019202020212022020406080
2016201720182019202020212022020406080
Additional affiliations
September 2013 - present
University of Burgundy
Position
  • Professor (Associate)

Publications

Publications (56)
Article
Full-text available
Significance The adult human brain is organized in unimodal regions responding selectively to categories of environmental sensory stimuli. Here, we document the origin of category-selective visual brain responses in infancy, demonstrating the key contribution of other senses. Visual categorization is recorded neurally in 4-mo-old infants presented...
Preprint
Full-text available
The human brain rapidly and automatically categorizes faces vs . other visual objects. However, whether face-selective neural activity predicts the subjective experience of a face – perceptual awareness – is debated. To clarify this issue, here we use face pareidolia , i.e., the illusory perception of a face, as a proxy to relate the neural categor...
Article
The influence of odor valence on expressive-face perception remains unclear. Here, three “valenced” odor contexts (pleasant, unpleasant, control) were diffused while scalp electroencephalogram (EEG) was recorded in 18 participants presented with expressive faces alternating at a 6-Hz rate. One facial expression (happiness, disgust or neutrality) re...
Article
According to recent evidence, rapid categorization of natural face images in the infant brain is enhanced by concomitant maternal odor (Leleu et al., 2020). To test whether this effect is selective to faces, we recorded scalp electroencephalogram (EEG) in 4-month-old infants presented with variable exemplars of a nonface visual category - cars - ap...
Article
To successfully interact with a rich and ambiguous visual environment, the human brain learns to differentiate visual stimuli and to produce the same response to subsets of these stimuli despite their physical difference. Although this visual categorization function is traditionally investigated from a unisensory perspective, its early development...
Article
Full-text available
Infants’ ability to discriminate facial expressions has been widely explored, but little is known about the rapid and automatic ability to discriminate a given expression against many others in a single experiment. Here we investigated the development of facial expression discrimination in infancy with fast periodic visual stimulation coupled with...
Article
The human brain rapidly and automatically categorizes faces vs. other visual objects. However, whether face-selective neural activity predicts the subjective experience of a face – perceptual awareness – is debated. To clarify this issue, here we use face pareidolia, i.e., the illusory perception of a face, as a proxy to relate the neural categoriz...
Article
Full-text available
Visual categorization is the brain ability to rapidly and automatically respond to a certain category of inputs. Whether category-selective neural responses are purely visual or can be influenced by other sensory modalities remains unclear. Here, we test whether odors modulate visual categorization, expecting that odors facilitate the neural catego...
Article
Full-text available
A recent body of research has emerged regarding the interactions between olfaction and other sensory channels to process social information. The current review examines the influence of body odors on face perception, a core component of human social cognition. First, we review studies reporting how body odors interact with the perception of invaria...
Conference Paper
Visual categorization is the rapid and automatic ability to provide a similar response to different exemplars of a single category despite widely variable sensory inputs. Whether visual categorization is solely visually-driven or can be influenced by other sensory modalities remains unclear. Here we test whether odor contexts can modulate visual ca...
Preprint
Full-text available
Visual categorization is the brain ability to rapidly and automatically respond to widely variable visual inputs in a category-selective manner (i.e., distinct responses between categories and similar responses within categories). Whether category-selective neural responses are purely visual or can be influenced by other sensory modalities remains...
Article
Full-text available
Recognizing facial expressions of emotions is a fundamental ability for adaptation to the social environment. To date, it remains unclear whether the spatial distribution of eye movements predicts accurate recognition or, on the contrary, confusion in the recognition of facial emotions. In the present study, we asked participants to recognize facia...
Data
Supporting information for the main article: Categorization of objects and faces in the infant brain and its sensitivity to maternal odor: further evidence for the role of intersensory congruency in perceptual development Published July 2020 in Cognitive Development 55:100930 doi: 10.1016/j.cogdev.2020.100930
Data
Preprocessed EEG data, behavioral measures, and participants infos for the study 'An ecological measure of rapid and automatic face-sex categorization' [see related article: doi: 10.1016/j.cortex.2020.02.007].
Article
Sex categorization is essential for mate choice and social interactions in many animal species. In humans, sex categorization is readily performed from the face. However, clear neural markers of face-sex categorization, i.e. common responses to widely variable individuals from one sex, have not been identified so far in humans. To isolate a direct...
Article
Full-text available
Variation in facial emotion processing abilities may contribute to variability in penetrance for psychotic symptoms in 22q11.2DS. However, the precise nature of the social cognitive dysfunction (i.e., facial expression perception vs. emotion recognition), the potential additional roles of genetic and environmental variabilities, and consequently th...
Article
Automatic responses to brief expression changes from a neutral face have been recently isolated in the human brain using fast periodic visual stimulation (FPVS) coupled with scalp electroencephalography (EEG). Based on these observations, here we isolate specific neural signatures for the rapid categorization of each of 5 basic expressions, i.e., w...
Article
Full-text available
Although various psychiatric disorders present with social-cognitive impairment, a measure assessing social-cognitive processes implicitly and reliably, with high selectivity and with enough signal-to-noise ratio (SNR) for individual evaluation of any population at any age, is lacking. Here we isolate a neural marker quantifying impaired visual cod...
Article
Efficient decoding of even brief and slight intensity facial expression changes is important for social interactions. However, robust evidence for the human brain ability to automatically detect brief and subtle changes of facial expression remains limited. Here we built on a recently developed paradigm in human electrophysiology with full-blown ex...
Conference Paper
Efficient understanding of emotions from expressive faces is crucial for human interactions. Specific human electrophysiological responses to brief neutral-to-emotion changes of facial expression can be isolated in a few minutes, without explicit task, with fast periodic visual stimulation (Dzhelyova et al., 2017). Here we aimed at extending these...
Conference Paper
To interact with an unlabeled rich visual world, the human developing brain learns to differentiate visual events and to generalize across some of them despite their physical variability. Although this perceptual categorization process has been traditionally investigated from a unisensory perspective, the early development of visual categorization...
Conference Paper
Human faces are readily and automatically categorized for gender across a wide range of variable cues, a critical visual function for social interactions. To identify an implicit measure of rapid face gender categorization, we recorded scalp electroencephalogram (EEG) from 32 participants (16 females). In a first experiment, highly variable face im...
Article
Full-text available
Rare neurodevelopmental syndromes often present social cognitive deficits that may underlie difficulties in social interactions and increase the risk of psychosis or autism spectrum disorders. However, little is known regarding the specificities of social cognitive impairment across syndromes while it remains a major challenge for the care. Our rev...
Article
Difficulties in the recognition of emotions in expressive faces have been reported in people with 22q11.2 deletion syndrome (22q11.2DS). However, while low-intensity expressive faces are frequent in everyday life, nothing is known about their ability to perceive facial emotions depending on the intensity of expression. Through a visual matching tas...
Conference Paper
Perceiving emotional expressions from faces is essential for social interactions. However, while the intensity of facial expressions is highly variable in everyday-life, perceptual tuning to facial expression of various intensities remains largely unknown. Here we recorded scalp electroencephalogram (EEG) from 18 adult participants during fast peri...
Article
Full-text available
It has been established that the recognition of facial expressions integrates contextual information. In this study, we aimed to clarify the influence of contextual odors. The participants were asked to match a target face varying in expression intensity with non-ambiguous expressive faces. Intensity variations in the target faces were designed by...
Conference Paper
When a background auditory rhythm is played, visual objects are processed faster when presented in synchrony with the beat than out of synchrony, reflecting the oscillating entrainment of attention (Brochard et al., 2013; Escoffier et al., 2010). The present study aimed to investigate whether attentional entrainment induced by an irrelevant rhythm...
Conference Paper
In a previous experiment, we found that olfaction influences the incidental processing of facial expressions in two ways. First, it enhances the event-related potentials (ERPs) in response to facial expression around 150 ms after stimulus-onset regardless of the emotional content of expressions and the hedonic value of the odorant. Second, it modul...
Conference Paper
Detecting and understanding facial expressions are essential for human social adaptation. These skills are not independent from contextual effects, however, as environmental cues can enhance the comprehension of others’ emotion. In particular, the odor context has been shown to modulate visual attention toward objects and faces. So far, little is k...
Article
La microdélétion 22q11.2 est le syndrome microdélétionnel le plus fréquent de la population générale. Le phénotype associe des anomalies de l’appareil pharyngé embryonnaire à un phénotype neurocomportemental. La présentation clinique du syndrome est extrêmement variable d’un individu à l’autre, quelle que soit la taille de la délétion, et plus de 1...
Article
Full-text available
The 22q11.2 deletion syndrome (22q11.2DS) is caused by hemizygous microdeletions on chromosome 22. 22q11.2DS has several presentations including Di George's syndrome, velo-cardio-facial syndrome or Shprintzen's syndrome and it is the most frequent microdeletion syndrome in the general population (prevalence estimated at 1/4000 births, de novo: 90%)...
Article
The impairment of social cognition, including facial affects recognition, is a well-established trait in schizophrenia, and specific cognitive remediation programs focusing on facial affects recognition have been developed by different teams worldwide. However, even though social cognitive impairments have been confirmed, previous studies have also...
Article
Full-text available
L’altération de la cognition sociale associée à la schizophrénie, dont fait partie la perception des émotions faciales, a fait l’objet d’une récente méta-analyse qui a révélé son impact majeur sur l’insertion sociale et professionnelle. Or l’utilisation de programmes de remédiation cognitive portant sur le traitement des émotions faciales est frein...
Conference Paper
The ability to recognize facial expressions may imply the matching between self-produced emotions and those perceived in others. To investigate this issue, we designed two experiments in which participants had to match the emotion expressed by a centrally-presented face with one of the expressions (anger, disgust, fear, happiness, sadness, neutral)...
Conference Paper
Visually detecting and understanding facial expressions are important skills for social adaptation. In daily life, the context created by other sensory cues often helps to better delineate facially-expressed emotional subtleties. Odors have been little studied in that perspective, although they have been shown to modulate visual attention toward ob...
Conference Paper
It is now well-admitted that contextual information modulates the perception of facial expressions, as it may help disambiguate the visual input and improve detection of emotional faces presented at low intensities. Notably, contextual integration can proceed through multimodal processing. However, odors have been little studied in that perspective...
Article
Sex-related hemispheric lateralization and interhemispheric transmission times (IHTTs) were examined in twenty-four participants at the level of the first visual ERP components (P1 and N170) during face identity encoding in a divided visual-field paradigm. While no lateralization-related and sex-related differences were reflected in the P1 characte...
Conference Paper
Sex differences in hemispheric lateralization during verbal and visuo-spatial processing have been reported in several studies with men being stronger lateralized than women (McGlone, 1980; Voyer, 1996; Kansaku et al., 2000; Gur et al., 2000; Rilea et al., 2004). This phenomenon was also observed during face processing with stronger right-hemispher...
Article
Previous studies on face processing have revealed an asymmetric overlap between identity and expression, as identity is processed irrespective of expression while expression processing partly depends on identity. To investigate whether this relative interaction is caused by dominance of identity over expression, participants performed familiarity a...
Article
We investigate the left mini-neglect theory in phonological dyslexics and in normal readers in a visual matching task. Behavioral and electrophysiological results reveal two profiles of dyslexics but do not confirm this theory. However, a different mobilization of visuo-attentional abilities is suggested in dyslexic subjects.
Article
Full-text available
Research has demonstrated that people readily pay more attention to negative than to positive and/or neutral stimuli. However, evidence from recent studies indicated that such an attention bias to negative information is not obligatory but sensitive to various factors. Two experiments using intergroup evaluative tasks (Study 1: a gender-related gro...
Article
Models of face processing suggest that facial familiarity and expression processes involve independent visual systems. But under some conditions, the two processes interact, as when selective attention is solicited, and/or when a link is established between consecutive stimuli. To assess these assumptions during perceptual face processing, event-re...
Article
The main objective of this study was to examine fronto-parietal networks underlying visual duration discriminations. Two types of interference tasks were used to augment cognitive load: line orientation associated with the right hemisphere and multiplication with the left. Both subtasks deteriorated duration discriminations, more severely for line...

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