Fabrice Robichon

University of Burgundy, Dijon, Bourgogne, France

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Publications (22)32.08 Total impact

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    ABSTRACT: This study investigated children's perceptual ability to process second-order facial relations. In total, 78 children in three age groups (7, 9, and 11 years) and 28 adults were asked to say whether the eyes were the same distance apart in two side-by-side faces. The two faces were similar on all points except the space between the eyes, which was either the same or different, with various degrees of difference. The results showed that the smallest eye spacing children were able to discriminate decreased with age. This ability was sensitive to face orientation (upright or upside-down), and this inversion effect increased with age. It is concluded here that, despite early sensitivity to configural/holistic information, the perceptual ability to process second-order relations in faces improves with age and constrains the development of the face recognition ability.
    Journal of Experimental Child Psychology 11/2010; 107(3):195-206. · 3.12 Impact Factor
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    ABSTRACT: The development of children's ability to recognize facial emotions and the role of configural information in this development were investigated. In the study, 100 5-, 7-, 9-, and 11-year-olds and 26 adults needed to recognize the emotion displayed by upright and upside-down faces. The same participants needed to recognize the emotion displayed by the top half of an upright or upside-down face that was or was not aligned with a bottom half that displayed another emotion. The results showed that the ability to recognize facial emotion develops with age, with a developmental course that depends on the emotion to be recognized. Moreover, children at all ages and adults exhibited both an inversion effect and a composite effect, suggesting that children rely on configural information to recognize facial emotions.
    Journal of Experimental Child Psychology 06/2007; 97(1):14-27. · 3.12 Impact Factor
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    ABSTRACT: To evaluate the consequences of proprioception changes induced by a postural treatment on cognitive disturbances in children suffering from developmental dyslexia. and methods: Twenty male dyslexic children were treated with prisms within their spectacles and a postural treatment. A control group of dyslexics (n=13) only received spectacles without prisms. All participants were evaluated at the beginning of the study and 6 months later with reading impairment tests and postural examinations. Mean age was 11 years and 5 months in the treated group and 11 years and 7 months in the control group. Four children were excluded from the 6-month analysis because of poor compliance. All dyslexic children presented with a postural deficiency syndrome. In 13 out of 16 treated children, dyslexia was improved at 6 months, especially for the global leximetric test and the reading of regular and irregular words. However, the treatment did not allow a complete recovery of reading ability when compared with age-matched individuals. Our results show that postural modifications may favorably influence some clinical signs associated with developmental dyslexia. Further studies with a larger sample and with a longer follow-up period are required to better assess the role of postural treatment in developmental dyslexia.
    Journal francais d'ophtalmologie 05/2007; 30(4):380-9. · 0.51 Impact Factor
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    ABSTRACT: But de l’étudeL’objectif de ce travail est d’évaluer l’impact des modifications proprioceptives induites par un traitement postural sur les troubles cognitifs d’une population d’enfants souffrant de dyslexie de développement.Patients et méthodesIl a été constitué un groupe de 20 enfants dyslexiques traités par prismes posturaux, semelles « de posture » et rééducation posturale, et un groupe témoin de 13 enfants dyslexiques portant uniquement des lunettes sans prismes. Tous les enfants étaient de sexe masculin. Lors de leur inclusion dans l’étude (M0) et 6 mois plus tard (M6), tous les participants ont été évalués par un bilan ophtalmologique et postural et ont reçu un examen neuropsychologique concernant les processus visuo-lexicaux par un examinateur en insu ainsi que les processus phonologiques et métaphonologiques.RésultatsL’âge moyen des enfants du « groupe traité » était de 11 ans et 5 mois et celui des enfants du « groupe non traité » de 11 ans et 7 mois. Quatre enfants du « groupe traité » ont été exclus à M6 pour non-observance du traitement. Tous les patients dyslexiques présentaient un syndrome de déficience posturale lors de l’inclusion. Chez les sujets traités, le traitement a été bénéfique pour les signes fonctionnels et la plupart des signes physiques par rapport au « groupe non traité ». Chez 13 des 16 enfants traités, il a amélioré de manière significative certains paramètres de la dyslexie, notamment le test de leximétrie globale, la lecture des mots réguliers et irréguliers, et les épreuves de décision orthographique et de complétion graphémique. Les épreuves concernant les processus phonologiques et celles concernant la manipulation mentale des sons du langage (conscience phonologique) n’ont pas été significativement améliorées.ConclusionLes résultats de cette étude ouvrent une nouvelle voie de recherche en montrant qu’une modification de la proprioception peut être bénéfique sur certains éléments cliniques rencontrés dans la dyslexie de développement. Le niveau d’action du traitement postural sur les signes de dyslexie qui se sont améliorés reste à préciser. Cette étude préliminaire doit être complétée par un essai thérapeutique sur un plus grand nombre de patients et pendant une plus longue durée.PurposeTo evaluate the consequences of proprioception changes induced by a postural treatment on cognitive disturbances in children suffering from developmental dyslexia.Material and methodsTwenty male dyslexic children were treated with prisms within their spectacles and a postural treatment. A control group of dyslexics (n=13) only received spectacles without prisms. All participants were evaluated at the beginning of the study and 6 months later with reading impairment tests and postural examinations.ResultsMean age was 11 years and 5 months in the treated group and 11 years and 7 months in the control group. Four children were excluded from the 6-month analysis because of poor compliance. All dyslexic children presented with a postural deficiency syndrome. In 13 out of 16 treated children, dyslexia was improved at 6 months, especially for the global leximetric test and the reading of regular and irregular words. However, the treatment did not allow a complete recovery of reading ability when compared with age-matched individuals.Conclusion Our results show that postural modifications may favorably influence some clinical signs associated with developmental dyslexia. Further studies with a larger sample and with a longer follow-up period are required to better assess the role of postural treatment in developmental dyslexia.
    Journal francais d'ophtalmologie 01/2007; 30(4):380-389. · 0.51 Impact Factor
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    ABSTRACT: The present investigation tries to better understand potential association and causal relationship between phonological and postural impairment due to developmental dyslexia. The study included 50 boys with developmental dyslexia and selected on the basis of their overall reading difficulties, and 42 control boys. Body sway during a quite standing posture eye open and eye closed on a force platform were tested in the two groups of subjects that were between 10 and 13 years of age. Analysis of classical parameters quantifying the centre of pressure (CP) displacements along antero-posterior and lateral axes showed a significant difference between the two groups. Dyslexic children showed on average greater instability, with greater length, variability and mean power frequency of CP displacements with or without vision. Our results demonstrate that postural parameters may discriminate between children with dyslexia and age-equivalent controls.
    Neuroscience Letters 09/2006; 403(3):211-5. · 2.03 Impact Factor
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    ABSTRACT: The objective of this study is to assess proprioception anomalies in postural deficiency syndrome in a group of children suffering from reading impairment. Sixty male patients with an average age of 11 years and 9 months were included in the study. Initially, they were given a standardized neuropsychological examination, which confirmed the diagnosis of reading impairment. Then after filling out a questionnaire seeking a proprioceptive anomaly, the patients were subjected to a clinical ocular and postural examination consisting of nine precisely described steps. All of the patients recruited for the study presented clinical signs confirming a proprioception disorder found as a part of postural deficiency syndrome. This study opens a new direction for research concerning the origin and treatment of at least some reading-impaired children.
    Journal francais d'ophtalmologie 10/2005; 28(7):713-23. · 0.51 Impact Factor
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    ABSTRACT: Purpose The objective of this study is to assess proprioception anomalies in postural deficiency syndrome in a group of children suffering from reading impairment. Material and methods Sixty male patients with an average age of 11 years and 9 months were included in the study. Initially, they were given a standardized neuropsychological examination, which confirmed the diagnosis of reading impairment. Then after filling out a questionnaire seeking a proprioceptive anomaly, the patients were subjected to a clinical ocular and postural examination consisting of nine precisely described steps. Results All of the patients recruited for the study presented clinical signs confirming a proprioception disorder found as a part of postural deficiency syndrome. Conclusion This study opens a new direction for research concerning the origin and treatment of at least some reading-impaired children.
    Journal francais d'ophtalmologie 09/2005; 28(7):713–723. · 0.51 Impact Factor
  • E Vinckenbosch, F Robichon, S Eliez
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    ABSTRACT: Affecting up to 4-10% of the population, dyslexia is a highly prevalent, childhood onset developmental disorder adversely influencing multiple domains of adaptive functioning throughout the lifespan. The present brain imaging study was conducted in order to investigate the neuroanatomical correlates of developmental dyslexia. The MRI brain scans of 10 males with dyslexia and 14 matched controls were analyzed with (1) a classical volumetric method measuring gray and white matter lobar volumes and (2) a voxel-by-voxel method. The voxel-by-voxel method identifies changes in tissue density and localizes morphologic alterations without limiting the analyses to predefined regions. Subsequent correlations between gray matter density and neuropsychological performance on specific phonological processing tasks (rhyme judgment) were conducted. Volumetric analyses revealed significantly reduced gray matter volumes in both temporal lobes in dyslexic individuals. The voxel-by-voxel analyses further localized changes to the left temporal lobe, revealing reduced gray matter density in the middle and inferior temporal gyri. Conversely, increased gray matter density was found in the precentral gyri bilaterally. As a combined group, the dyslexic and control subjects demonstrated positive correlations between performance on the rhyme judgment tasks and gray matter density in the middle and inferior frontal gyri, and the middle temporal gyri bilaterally. The current study indicates that dyslexia is associated with a structural gray matter deficit involving a complex fronto-temporal network implicated in phonological processing.
    Neuropsychologia 02/2005; 43(3):324-31. · 3.48 Impact Factor
  • P. Vernet, P. Quercia, F. Robichon, T. Pozzo
    Gait & Posture - GAIT POSTURE. 01/2005; 21.
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    Journal Francais D Ophtalmologie - J FR OPHTALMOL. 01/2005; 28(7):713-723.
  • Fabrice Robichon, Mireille Besson, Michel Habib
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    ABSTRACT: Event-related potentials and cued-recall performance were used to compare dyslexic and control adult subjects. Sentences that ended either congruously or incongruously were presented visually, one word at a time, at fast (stimulus-onset-asynchrony (SOA)=100 ms) or slow (SOA=700 ms) rates of presentation. Results revealed (1) a large effect of presentation rate that started with the N1-P2 components and lasted for the entire recording period, (2) larger N400 components for dyslexic than control subjects, at slow presentation rates, to both congruous and incongruous endings and (3) a large ERPs difference related to memory (Dm effect) that did not differentiate controls from dyslexics but was larger at slow than at fast rates of presentation. These findings indicate that the reading impairment observed in the present group of adult dyslexics is more likely to result from difficulties integrating the meaning of words within a sentence context than from pure sensory processing deficits.
    Biological Psychology 03/2002; 59(1):29-53. · 3.40 Impact Factor
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    ABSTRACT: Williams syndrome (WS) is a rareneuro-developmental disorder characterised byspared language in the face of serious deficitsin nonlinguistic cognitive abilities. Weconducted a study on ten WS individuals inwhich gender agreement and gender assignmentwere assessed by means of two tasks: gendercategorisation and gender concord. Subjectsperformed gender categorisation to real nounswhose gender was regular or exceptional giventheir ending, and to invented nouns which werecomposed of nonword or word stems and realword-endings. The same material was used in thegender concord task in which subjects had tomatch the items with the appropriate form ofthe article and the adjective carrying genderagreement. In the gender categorisation of realwords, WS were lower than controls but bothgroups demonstrated a similar sensitivity togender-ending regularities. In the gendercategorisation of nonwords, the results showeda clear dissociation. The WS subjects producedmore ending-consistent responses than thecontrols. Contrary to the controls, WS reliedheavily on the gender clue provided by theending even when the gender of the word evokedby the stem of the invented word was opposed tothat evoked by the ending. Participants with WSwere not influenced by the specific word evokedby the stem of the invented word. In the secondtask (concord task), the WS subjects performed well although lower than thecontrols. We concluded that the WS people werenot impaired in gender agreement which relieson syntactic rules and/or on the extraction ofregularities but experienced difficulties inretrieving lexical instances.
    Reading and Writing 01/2002; 15(5):589-612. · 1.44 Impact Factor
  • F Robichon, P Bouchard, J Démonet, M Habib
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    ABSTRACT: Using a new method based upon the measurement of four angles, we analyzed the corpus callosum of 23 adult male dyslexics and 25 age-matched controls on MRI sagittal scans. Two out of the four angles measured showed significant differences between the groups that are consistent with previous findings concerning the size of the corpus callosum in dyslexics. In particular, posterior regions are concerned, displaying a lowered corpus callosum in dyslexics. These findings are discussed in relation to cortical parietal asymmetries and possible hormonal events, referring to the testosterone hypothesis, that could occur in utero or in the perinatal period in the dyslexic population.
    European Neurology 02/2000; 43(4):233-7. · 1.50 Impact Factor
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    F Robichon, O Levrier, P Farnarier, M Habib
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    ABSTRACT: Using brain magnetic resonance imaging, we measured in 16 young developmental dyslexic adults and 14 age-matched controls cortical asymmetries of posterior language-related areas, including Planum temporale and parietal operculum cortical ribbon, and of the inferior frontal region related in the left hemisphere to speech processing. In addition, we assessed the sulcal morphology of the inferior frontal gyrus in both groups according to a qualitative method. The dyslexic subjects also performed specific tasks exploring different aspects of phonological and lexical-semantic processes. Results showed that: (1) contrary to most results reported in the literature, there is a lack of any morphological difference relative to Planum temporale asymmetry between the two groups; (2) there are significant differences between dyslexic and control subjects relative to frontal areas; (3) concerning the parietal region, there is a more asymmetrical pattern towards the left side in dyslexic subjects than in controls; and (4) relations in dyslexic subjects between parietal asymmetry coefficient and the level of performance in a phonological task have a particular reliance on verbal short-term memory, frontal asymmetry and performance in a non-word reading task. Considering these results it is suggested that phonological segmentation skills may relate to frontal lobe morphology, while phonological memory-based impairment in people with dyslexia may rather relate to parietal lobe morphology.
    European Journal of Neurology 02/2000; 7(1):35-46. · 4.16 Impact Factor
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    F Robichon, M Habib
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    ABSTRACT: The classical notion that developmental dyslexia may somehow relate to impaired communication between hemispheres has not yet received convincing support. Sixteen dyslexic adults and 12 controls received a high resolution brain MRI scan for morphometric study of the corpus callosum. Automatized measurements of callosal area and calculation of indices defining the general morphology of the callosal mid-surface were performed. Each participant received global intelligence and reading achievement evaluation; dyslexics were further proposed specific neuropsychological tests specially designed to explore the mechanisms of reading impairment. It just appears from the group comparisons (1) that the dyslexics' corpus callosum displays a more circular and evenly thicker general shape, and (2) that the midsagittal surface is on the average larger than in controls, in particular in the isthmus. Moreover, the different morphometric characteristics of the dyslexic brain correlated with the degree of impairment on various tests exploring phonological abilities. In vivo morphometry of the corpus callosum may provide valuable hints for understanding developmental learning disorders and their consequences in adults.
    Brain and Language 04/1998; 62(1):127-46. · 3.39 Impact Factor
  • M. Habib, K. Giraud, M. Berbon, F. Robichon
    Journal of The Neurological Sciences - J NEUROL SCI. 01/1997; 150.
  • F. Robichon, M. Habib
    Journal of The Neurological Sciences - J NEUROL SCI. 01/1997; 150.
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    ABSTRACT: Discusses the significance of the N400 component in event-related brain potentials and in testing models derived from psycholinguistic research. Most previous research has been conducted in English and has used standardized materials which allow comparison between results obtained in different labs. This study provides such materials in French. 744 sentences were construced and presented to 52 native French speakers. The last word of each sentence was omitted, and Ss completed the sentence context with the 1st word that came to mind. The Cloze probability was computed for each sentence. Results are presented as a function of the number of words per sentence. Three sets of sentences were created depending on the terminal word's Cloze probability. The use of these sentences in experiments on the electrophysiology of language processing and as a database in psycholinguistics and cognitive neuropsychology is discussed. (French & English abstracts) (PsycINFO Database Record (c) 2012 APA, all rights reserved)
    Canadian Journal of Experimental Psychology 05/1996; 50(2):205-233. · 1.02 Impact Factor
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    ABSTRACT: La découverte, par Kutas et Hillyard (1980), d'une composante négative des potentiels évoqués corticaux, la composante N400, associée à la présentation d'un mot peu attendu en fonction du contexte linguistique dans lequel il est présenté, a soulevé un vif intérêt et suscité un grand nombre de recherches. Ces travaux ont permis de spécifier les conditions d'occurrence de cette composante et d'apporter des informations importantes dans divers domaines de recherche, comme l'analyse des processus qui président à la reconnaissance des mots, les effets de la répétition, les effets du contexte linguistique sur la reconnaissance des mots et les pathologies du langage. Ces expériences ont, le plus souvent, été réalisées dans les pays anglo-saxons, à partir d'un matériel linguistique étalonné et standardisé; celui-ci facilite la construction du matériel spécifiquement adapté à chaque expérience et la comparaison des résultats obtenus dans les différents laboratoires. Le but de notre étude était de mettre à la disposition des chercheurs un matériel équivalent en langue française. Nous avons construit 744 contextes linguistiques, de différents formats. Afin d'obtenir les normes de complétion souhaitées, nous avons présenté ces contextes linguistiques à 52 sujets, de langue maternelle française. Ils avaient pour tâche de compléter chaque contexte par le premier mot qui leur venait à l'esprit, permettant de former une phrase sémantiquement et syntaxiquement correcte. La probabilité qu'un mot particulier soit donné pour compléter une phrase (Taylor, 1953) a été calculée en fonction du nombre de mots qui composent le contexte des phrases. Trois groupes de phrases ont été constitués selon la probabilité d'occurrence du dernier mot: faible (n = 576), forte (n = 58) ou très forte (proverbes, n = 110). L'utilisation de ces phrases dans les études électrophysiologiques des processus liés à la compréhension du langage et les travaux neuropsychologiques devrait faciliter les recherches expérimentales dans ces domaines.
    Canadian Journal of Experimental Psychology-revue Canadienne De Psychologie Experimentale - CAN J EXP PSYCHOL. 01/1996; 50(2):205-233.
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    ABSTRACT: The general theory on the biological foundations of cerebral dominance formulated in 1985 by Geschwind and Galaburda entirely relies on a postulated causal relationship between anatomical asymmetry of the planum temporale and functional lateralization of the human brain, but does not take into account asymmetry of another cortical region, the parietal operculum. In 40 normal volunteers whose handedness was specified by the Edinburgh Handedness Inventory, we assessed asymmetries of these two regions on MRI sagittal scans. For both measurements, a significantly larger leftward asymmetry was found in the 24 consistent right-handers compared to the 16 non-right-handers. Moreover, the combination, for each subject, of the two indices of asymmetry, yielded four different subtypes between which handedness distribution significantly differed. We conclude that planum temporale and parietal operculum asymmetries may be divergent and that their convergence is strongly associated with right-handedness. Functional and developmental implications of these findings are discussed by reference to the Geschwind/Galaburda theory.
    Brain and Language 03/1995; 48(2):238-58. · 3.39 Impact Factor