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Interaction of Finger Representations in the Cortex of Individuals with Autism: A Functional Window into Cortical Inhibition / Mehmet Akif COSKUN in Autism Research, 6-6 (December 2013)
[article]
Titre : Interaction of Finger Representations in the Cortex of Individuals with Autism: A Functional Window into Cortical Inhibition Type de document : Texte imprimé et/ou numérique Auteurs : Mehmet Akif COSKUN, Auteur ; Katherine A. LOVELAND, Auteur ; Deborah A. PEARSON, Auteur ; Andrew C. PAPANICOLAOU, Auteur ; Bhavin R. SHETH, Auteur Année de publication : 2013 Article en page(s) : p.542-549 Langues : Anglais (eng) Mots-clés : evoked potentials homeostasis somatosensory cortex cortical interaction finger representation source modeling tactile Index. décimale : PER Périodiques Résumé : An established neural biomarker of autism spectrum disorder (ASD) has the potential to provide novel biological and pharmacological targets for treatment. Lower level of inhibition in brain circuits is a leading biomarker candidate. A physiological investigation of the functional levels of inhibition in the cortex of individuals with autism can provide a strong test of the hypothesis. The amplitude of cortical response to the stimulation of adjacent fingers is controlled by the level of cortical inhibition and provides just such a test. Using magnetoencephalography, we recorded the response of the somatosensory cortex to the passive tactile stimulation of the thumb (D1), and index finger (D2), and to the simultaneous stimulation of both fingers combined (D1,D2) of the dominant (right) hand of young subjects with and without autism. For each participant, we measured the response to the stimulation of both fingers combined (D1,D2) relative to the post hoc sum of the responses to the stimulation of each finger alone (D1+D2) in multiple different ways and linearly regressed the ASD and neurotypical (NT) groups' responses. The resulting slopes were then compared: Smaller slope values imply attenuated response to paired finger stimulation, and enhanced levels of inhibition. The short-latency M40 and mid-latency M80 response slopes of the group with autism obtained in different ways were either significantly smaller, or statistically indistinguishable from NT. The result does not support reduced inhibition in the somatosensory cortex of individuals with autism, contrary to the seminal hypothesis of reduced inhibition. Implications are discussed including refinements of current theory. En ligne : http://dx.doi.org/10.1002/aur.1314 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=221
in Autism Research > 6-6 (December 2013) . - p.542-549[article] Interaction of Finger Representations in the Cortex of Individuals with Autism: A Functional Window into Cortical Inhibition [Texte imprimé et/ou numérique] / Mehmet Akif COSKUN, Auteur ; Katherine A. LOVELAND, Auteur ; Deborah A. PEARSON, Auteur ; Andrew C. PAPANICOLAOU, Auteur ; Bhavin R. SHETH, Auteur . - 2013 . - p.542-549.
Langues : Anglais (eng)
in Autism Research > 6-6 (December 2013) . - p.542-549
Mots-clés : evoked potentials homeostasis somatosensory cortex cortical interaction finger representation source modeling tactile Index. décimale : PER Périodiques Résumé : An established neural biomarker of autism spectrum disorder (ASD) has the potential to provide novel biological and pharmacological targets for treatment. Lower level of inhibition in brain circuits is a leading biomarker candidate. A physiological investigation of the functional levels of inhibition in the cortex of individuals with autism can provide a strong test of the hypothesis. The amplitude of cortical response to the stimulation of adjacent fingers is controlled by the level of cortical inhibition and provides just such a test. Using magnetoencephalography, we recorded the response of the somatosensory cortex to the passive tactile stimulation of the thumb (D1), and index finger (D2), and to the simultaneous stimulation of both fingers combined (D1,D2) of the dominant (right) hand of young subjects with and without autism. For each participant, we measured the response to the stimulation of both fingers combined (D1,D2) relative to the post hoc sum of the responses to the stimulation of each finger alone (D1+D2) in multiple different ways and linearly regressed the ASD and neurotypical (NT) groups' responses. The resulting slopes were then compared: Smaller slope values imply attenuated response to paired finger stimulation, and enhanced levels of inhibition. The short-latency M40 and mid-latency M80 response slopes of the group with autism obtained in different ways were either significantly smaller, or statistically indistinguishable from NT. The result does not support reduced inhibition in the somatosensory cortex of individuals with autism, contrary to the seminal hypothesis of reduced inhibition. Implications are discussed including refinements of current theory. En ligne : http://dx.doi.org/10.1002/aur.1314 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=221 Tactile hypersensitivity and GABA concentration in the sensorimotor cortex of adults with autism / L. A. SAPEY-TRIOMPHE in Autism Research, 12-4 (April 2019)
[article]
Titre : Tactile hypersensitivity and GABA concentration in the sensorimotor cortex of adults with autism Type de document : Texte imprimé et/ou numérique Auteurs : L. A. SAPEY-TRIOMPHE, Auteur ; F. LAMBERTON, Auteur ; Sandrine SONIE, Auteur ; J. MATTOUT, Auteur ; C. SCHMITZ, Auteur Article en page(s) : p.562-575 Langues : Anglais (eng) Mots-clés : autism spectrum disorder gamma-aminobutyric acid hypersensitivity magnetic resonance spectroscopy somatosensory cortex touch Index. décimale : PER Périodiques Résumé : Sensory hypersensitivity is frequently encountered in autism spectrum disorder (ASD). Gamma-aminobutyric acid (GABA) has been hypothesized to play a role in tactile hypersensitivity. The aim of the present study was twofold. First, as a study showed that children with ASD have decreased GABA concentrations in the sensorimotor cortex, we aimed at determining whether the GABA reduction remained in adults with ASD. For this purpose, we used magnetic resonance spectroscopy to measure GABA concentration in the sensorimotor cortex of neurotypical adults (n = 19) and ASD adults (n = 18). Second, we aimed at characterizing correlations between GABA concentration and tactile hypersensitivity in ASD. GABA concentration in the sensorimotor cortex of adults with ASD was lower than in neurotypical adults (decrease by 17%). Interestingly, GABA concentrations were positively correlated with self-reported tactile hypersensitivity in adults with ASD (r = 0.50, P = 0.01), but not in neurotypical adults. In addition, GABA concentrations were negatively correlated with the intra-individual variation during threshold measurement, both in neurotypical adults (r = -0.47, P = 0.04) and in adults with ASD (r = -0.59, P = 0.01). In other words, in both groups, the higher the GABA level, the more precise the tactile sensation. These results highlight the key role of GABA in tactile sensitivity, and suggest that atypical GABA modulation contributes to tactile hypersensitivity in ASD. We discuss the hypothesis that hypersensitivity in ASD could be due to suboptimal predictions about sensations. Autism Research 2019, 12: 562-575. (c) 2019 International Society for Autism Research, Wiley Periodicals, Inc. LAY SUMMARY: People with autism spectrum disorder (ASD) often experience tactile hypersensitivity. Here, our goal was to highlight a link between tactile hypersensitivity and the concentration of gamma-aminobutyric acid (GABA) (an inhibitory neurotransmitter) in the brain of adults with ASD. Indeed, self-reported hypersensitivity correlated with reduced GABA levels in brain areas processing touch. Our study suggests that this neurotransmitter may play a key role in tactile hypersensitivity in autism. En ligne : https://dx.doi.org/10.1002/aur.2073 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=388
in Autism Research > 12-4 (April 2019) . - p.562-575[article] Tactile hypersensitivity and GABA concentration in the sensorimotor cortex of adults with autism [Texte imprimé et/ou numérique] / L. A. SAPEY-TRIOMPHE, Auteur ; F. LAMBERTON, Auteur ; Sandrine SONIE, Auteur ; J. MATTOUT, Auteur ; C. SCHMITZ, Auteur . - p.562-575.
Langues : Anglais (eng)
in Autism Research > 12-4 (April 2019) . - p.562-575
Mots-clés : autism spectrum disorder gamma-aminobutyric acid hypersensitivity magnetic resonance spectroscopy somatosensory cortex touch Index. décimale : PER Périodiques Résumé : Sensory hypersensitivity is frequently encountered in autism spectrum disorder (ASD). Gamma-aminobutyric acid (GABA) has been hypothesized to play a role in tactile hypersensitivity. The aim of the present study was twofold. First, as a study showed that children with ASD have decreased GABA concentrations in the sensorimotor cortex, we aimed at determining whether the GABA reduction remained in adults with ASD. For this purpose, we used magnetic resonance spectroscopy to measure GABA concentration in the sensorimotor cortex of neurotypical adults (n = 19) and ASD adults (n = 18). Second, we aimed at characterizing correlations between GABA concentration and tactile hypersensitivity in ASD. GABA concentration in the sensorimotor cortex of adults with ASD was lower than in neurotypical adults (decrease by 17%). Interestingly, GABA concentrations were positively correlated with self-reported tactile hypersensitivity in adults with ASD (r = 0.50, P = 0.01), but not in neurotypical adults. In addition, GABA concentrations were negatively correlated with the intra-individual variation during threshold measurement, both in neurotypical adults (r = -0.47, P = 0.04) and in adults with ASD (r = -0.59, P = 0.01). In other words, in both groups, the higher the GABA level, the more precise the tactile sensation. These results highlight the key role of GABA in tactile sensitivity, and suggest that atypical GABA modulation contributes to tactile hypersensitivity in ASD. We discuss the hypothesis that hypersensitivity in ASD could be due to suboptimal predictions about sensations. Autism Research 2019, 12: 562-575. (c) 2019 International Society for Autism Research, Wiley Periodicals, Inc. LAY SUMMARY: People with autism spectrum disorder (ASD) often experience tactile hypersensitivity. Here, our goal was to highlight a link between tactile hypersensitivity and the concentration of gamma-aminobutyric acid (GABA) (an inhibitory neurotransmitter) in the brain of adults with ASD. Indeed, self-reported hypersensitivity correlated with reduced GABA levels in brain areas processing touch. Our study suggests that this neurotransmitter may play a key role in tactile hypersensitivity in autism. En ligne : https://dx.doi.org/10.1002/aur.2073 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=388