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Assessment of olfactory detection thresholds in children with autism spectrum disorders using a pulse ejection system / H. KUMAZAKI in Molecular Autism, 7 (2016)
[article]
Titre : Assessment of olfactory detection thresholds in children with autism spectrum disorders using a pulse ejection system Type de document : Texte imprimé et/ou numérique Auteurs : H. KUMAZAKI, Auteur ; T. MURAMATSU, Auteur ; T. X. FUJISAWA, Auteur ; M. MIYAO, Auteur ; E. MATSUURA, Auteur ; K. OKADA, Auteur ; H. KOSAKA, Auteur ; A. TOMODA, Auteur ; M. MIMURA, Auteur Article en page(s) : 6p. Langues : Anglais (eng) Mots-clés : Adolescent Aerosols Autism Spectrum Disorder/physiopathology/psychology Caproates Case-Control Studies Child Diagnostic Equipment Equipment Design Female Humans Hypesthesia/etiology/physiopathology/psychology Male Odorants Olfactory Perception/physiology Pentanols Pulsatile Flow Sensory Thresholds/physiology Autism spectrum disorder Laboratory-based studies Olfaction Olfactory detection threshold Pulse ejection system Index. décimale : PER Périodiques Résumé : BACKGROUND: Atypical responsiveness to olfactory stimuli has been reported as the strongest predictor of social impairment in children with autism spectrum disorders (ASD). However, previous laboratory-based sensory psychophysical studies that have aimed to investigate olfactory sensitivity in children with ASD have produced inconsistent results. The methodology of these studies is limited by several factors, and more sophisticated approaches are required to produce consistent results. METHODS: We measured olfactory detection thresholds in children with ASD and typical development (TD) using a pulse ejection system-a newly developed methodology designed to resolve problems encountered in previous studies. The two odorants used as stimuli were isoamyl acetate and allyl caproate. RESULTS: Forty-three participants took part in this study: 23 (6 females, 17 males) children with ASD and 20 with TD (6 females, 14 males). Olfactory detection thresholds of children with ASD were significantly higher than those of TD children with both isoamyl acetate (2.85 +/- 0.28 vs 1.57 +/- 0.15; p < 0.001) and allyl caproate ( 3.30 +/- 0.23 vs 1.17 +/- 0.08; p < 0.001). CONCLUSIONS: We found impaired olfactory detection thresholds in children with ASD. Our results contribute to a better understanding of the olfactory abnormalities that children with ASD experience. Considering the role and effect that odors play in our daily lives, insensitivity to some odorants might have a tremendous impact on children with ASD. Future studies of olfactory processing in ASD may reveal important links between brain function, clinically relevant behavior, and treatment. En ligne : http://dx.doi.org/10.1186/s13229-016-0071-2 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=328
in Molecular Autism > 7 (2016) . - 6p.[article] Assessment of olfactory detection thresholds in children with autism spectrum disorders using a pulse ejection system [Texte imprimé et/ou numérique] / H. KUMAZAKI, Auteur ; T. MURAMATSU, Auteur ; T. X. FUJISAWA, Auteur ; M. MIYAO, Auteur ; E. MATSUURA, Auteur ; K. OKADA, Auteur ; H. KOSAKA, Auteur ; A. TOMODA, Auteur ; M. MIMURA, Auteur . - 6p.
Langues : Anglais (eng)
in Molecular Autism > 7 (2016) . - 6p.
Mots-clés : Adolescent Aerosols Autism Spectrum Disorder/physiopathology/psychology Caproates Case-Control Studies Child Diagnostic Equipment Equipment Design Female Humans Hypesthesia/etiology/physiopathology/psychology Male Odorants Olfactory Perception/physiology Pentanols Pulsatile Flow Sensory Thresholds/physiology Autism spectrum disorder Laboratory-based studies Olfaction Olfactory detection threshold Pulse ejection system Index. décimale : PER Périodiques Résumé : BACKGROUND: Atypical responsiveness to olfactory stimuli has been reported as the strongest predictor of social impairment in children with autism spectrum disorders (ASD). However, previous laboratory-based sensory psychophysical studies that have aimed to investigate olfactory sensitivity in children with ASD have produced inconsistent results. The methodology of these studies is limited by several factors, and more sophisticated approaches are required to produce consistent results. METHODS: We measured olfactory detection thresholds in children with ASD and typical development (TD) using a pulse ejection system-a newly developed methodology designed to resolve problems encountered in previous studies. The two odorants used as stimuli were isoamyl acetate and allyl caproate. RESULTS: Forty-three participants took part in this study: 23 (6 females, 17 males) children with ASD and 20 with TD (6 females, 14 males). Olfactory detection thresholds of children with ASD were significantly higher than those of TD children with both isoamyl acetate (2.85 +/- 0.28 vs 1.57 +/- 0.15; p < 0.001) and allyl caproate ( 3.30 +/- 0.23 vs 1.17 +/- 0.08; p < 0.001). CONCLUSIONS: We found impaired olfactory detection thresholds in children with ASD. Our results contribute to a better understanding of the olfactory abnormalities that children with ASD experience. Considering the role and effect that odors play in our daily lives, insensitivity to some odorants might have a tremendous impact on children with ASD. Future studies of olfactory processing in ASD may reveal important links between brain function, clinically relevant behavior, and treatment. En ligne : http://dx.doi.org/10.1186/s13229-016-0071-2 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=328 Olfactory processing in adults with autism spectrum disorders / B. WICKER in Molecular Autism, 7 (2016)
[article]
Titre : Olfactory processing in adults with autism spectrum disorders Type de document : Texte imprimé et/ou numérique Auteurs : B. WICKER, Auteur ; E. MONFARDINI, Auteur ; J. P. ROYET, Auteur Article en page(s) : 4p. Langues : Anglais (eng) Mots-clés : Adult Autism Spectrum Disorder/physiopathology/psychology Differential Threshold/physiology Emotions/physiology Female Humans Hyperesthesia/etiology/physiopathology/psychology Hypesthesia/etiology/physiopathology/psychology Male Odorants Olfactory Pathways/physiopathology Olfactory Perception/physiology Pleasure Recognition (Psychology)/physiology Sensory Thresholds Young Adult Autism spectrum disorders Hyperresponsiveness Identification Intensity Olfaction Pleasantness Suprathreshold detection Index. décimale : PER Périodiques Résumé : BACKGROUND: As evidenced in the DSM-V, autism spectrum disorders (ASD) are often characterized by atypical sensory behavior (hyper- or hypo-reactivity), but very few studies have evaluated olfactory abilities in individuals with ASD. METHODS: Fifteen adults with ASD and 15 typically developing participants underwent olfactory tests focused on superficial (suprathreshold detection task), perceptual (intensity and pleasantness judgment tasks), and semantic (identification task) odor processing. RESULTS: In terms of suprathreshold detection performance, decreased discrimination scores and increased bias scores were observed in the ASD group. Furthermore, the participants with ASD exhibited increased intensity judgment scores and impaired scores for pleasantness judgments of unpleasant odorants. Decreased identification performance was also observed in the participants with ASD compared with the typically developing participants. This decrease was partly attributed to a higher number of near misses (a category close to veridical labels) among the participants with ASD than was observed among the typically developing participants. CONCLUSIONS: The changes in discrimination and bias scores were the result of a high number of false alarms among the participants with ASD, which suggests the adoption of a liberal attitude in their responses. Atypical intensity and pleasantness ratings were associated with hyperresponsiveness and flattened emotional reactions, respectively, which are typical of participants with ASD. The high number of near misses as non-veridical labels suggested that categorical processing is functional in individuals with ASD and could be explained by attention-deficit/hyperactivity disorder. These findings are discussed in terms of dysfunction of the olfactory system. En ligne : http://dx.doi.org/10.1186/s13229-016-0070-3 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=329
in Molecular Autism > 7 (2016) . - 4p.[article] Olfactory processing in adults with autism spectrum disorders [Texte imprimé et/ou numérique] / B. WICKER, Auteur ; E. MONFARDINI, Auteur ; J. P. ROYET, Auteur . - 4p.
Langues : Anglais (eng)
in Molecular Autism > 7 (2016) . - 4p.
Mots-clés : Adult Autism Spectrum Disorder/physiopathology/psychology Differential Threshold/physiology Emotions/physiology Female Humans Hyperesthesia/etiology/physiopathology/psychology Hypesthesia/etiology/physiopathology/psychology Male Odorants Olfactory Pathways/physiopathology Olfactory Perception/physiology Pleasure Recognition (Psychology)/physiology Sensory Thresholds Young Adult Autism spectrum disorders Hyperresponsiveness Identification Intensity Olfaction Pleasantness Suprathreshold detection Index. décimale : PER Périodiques Résumé : BACKGROUND: As evidenced in the DSM-V, autism spectrum disorders (ASD) are often characterized by atypical sensory behavior (hyper- or hypo-reactivity), but very few studies have evaluated olfactory abilities in individuals with ASD. METHODS: Fifteen adults with ASD and 15 typically developing participants underwent olfactory tests focused on superficial (suprathreshold detection task), perceptual (intensity and pleasantness judgment tasks), and semantic (identification task) odor processing. RESULTS: In terms of suprathreshold detection performance, decreased discrimination scores and increased bias scores were observed in the ASD group. Furthermore, the participants with ASD exhibited increased intensity judgment scores and impaired scores for pleasantness judgments of unpleasant odorants. Decreased identification performance was also observed in the participants with ASD compared with the typically developing participants. This decrease was partly attributed to a higher number of near misses (a category close to veridical labels) among the participants with ASD than was observed among the typically developing participants. CONCLUSIONS: The changes in discrimination and bias scores were the result of a high number of false alarms among the participants with ASD, which suggests the adoption of a liberal attitude in their responses. Atypical intensity and pleasantness ratings were associated with hyperresponsiveness and flattened emotional reactions, respectively, which are typical of participants with ASD. The high number of near misses as non-veridical labels suggested that categorical processing is functional in individuals with ASD and could be explained by attention-deficit/hyperactivity disorder. These findings are discussed in terms of dysfunction of the olfactory system. En ligne : http://dx.doi.org/10.1186/s13229-016-0070-3 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=329