BACKGROUND: Deficits in olfactory function are common features in neurodegenerative and neuropsychiatric disorders. In Parkinson's disease, olfactory deficits were found in up to 90% of patients, and there is evidence for dopaminergic dysfunction underlying these deficits. Because of the involvement of the dopamine system in the pathophysiology of attention-deficit/hyperactivity disorder (ADHD), olfactory function was investigated in children with the disorder. METHODS: We assessed odor threshold, identification, and discrimination in 20 children and adolescents with ADHD without medication, 20 patients with ADHD treated with methylphenidate, and 20 healthy control subjects matched for IQ, age, and sex. RESULTS: Odor sensitivity was higher (lower threshold) in ADHD patients without medication than in healthy control subjects (p < .004; Cohen's d = 1.273), whereas medicated patients did not differ significantly from healthy control subjects. No significant differences between groups with regard to odor discrimination or identification were detected. CONCLUSIONS: Selectively improved odor sensitivity in children with ADHD is reported for the first time, whereas odor discrimination and identification were unaffected. Stimulant medication normalized the odor sensitivity threshold. It is proposed that dopaminergic dysregulation is involved in this phenomenon.
BACKGROUND: Deficits in olfactory function are common features in neurodegenerative and neuropsychiatric disorders. In Parkinson's disease, olfactory deficits were found in up to 90% of patients, and there is evidence for dopaminergic dysfunction underlying these deficits. Because of the involvement of the dopamine system in the pathophysiology of attention-deficit/hyperactivity disorder (ADHD), olfactory function was investigated in children with the disorder. METHODS: We assessed odor threshold, identification, and discrimination in 20 children and adolescents with ADHD without medication, 20 patients with ADHD treated with methylphenidate, and 20 healthy control subjects matched for IQ, age, and sex. RESULTS: Odor sensitivity was higher (lower threshold) in ADHDpatients without medication than in healthy control subjects (p < .004; Cohen's d = 1.273), whereas medicated patients did not differ significantly from healthy control subjects. No significant differences between groups with regard to odor discrimination or identification were detected. CONCLUSIONS: Selectively improved odor sensitivity in children with ADHD is reported for the first time, whereas odor discrimination and identification were unaffected. Stimulant medication normalized the odor sensitivity threshold. It is proposed that dopaminergic dysregulation is involved in this phenomenon.
Authors: Martin Schecklmann; Christina Schwenck; Regina Taurines; Christine Freitag; Andreas Warnke; Manfred Gerlach; Marcel Romanos Journal: J Neural Transm (Vienna) Date: 2012-07-19 Impact factor: 3.575
Authors: Martin Schecklmann; Christoph Pfannstiel; Andreas J Fallgatter; Andreas Warnke; Manfred Gerlach; Marcel Romanos Journal: J Neural Transm (Vienna) Date: 2011-12-20 Impact factor: 3.575
Authors: Ayelet Ben-Sasson; Timothy W Soto; Amy E Heberle; Alice S Carter; Margaret J Briggs-Gowan Journal: J Atten Disord Date: 2014-08-04 Impact factor: 3.256
Authors: E Stergiakouli; K Langley; H Williams; J Walters; N M Williams; S Suren; I Giegling; L S Wilkinson; M J Owen; M C O'Donovan; D Rujescu; A Thapar; W Davies Journal: Genes Brain Behav Date: 2011-01-24 Impact factor: 3.449