title: A functional imaging study of self-regulatory capacities in persons who stutter.
abstract: Developmental stuttering is a disorder of speech fluency with an unknown pathogenesis. The similarity of its phenotype and natural history with other childhood neuropsychiatric disorders of frontostriatal pathology suggests that stuttering may have a closely related pathogenesis. We investigated in this study the potential involvement of frontostriatal circuits in developmental stuttering. We collected functional magnetic resonance imaging data from 46 persons with stuttering and 52 fluent controls during performance of the Simon Spatial Incompatibility Task. We examined differences between the two groups of blood-oxygen-level-dependent activation associated with two neural processes, the resolution of cognitive conflict and the context-dependent adaptation to changes in conflict. Stuttering speakers and controls did not differ on behavioral performance on the task. In the presence of conflict-laden stimuli, however, stuttering speakers activated more strongly the cingulate cortex, left anterior prefrontal cortex, right medial frontal cortex, left supplementary motor area, right caudate nucleus, and left parietal cortex. The magnitude of activation in the anterior cingulate cortex correlated inversely in stuttering speakers with symptom severity. Stuttering speakers also showed blunted activation during context-dependent adaptation in the left dorsolateral prefrontal cortex, a brain region that mediates cross-temporal contingencies. Frontostriatal hyper-responsivity to conflict resembles prior findings in other disorders of frontostriatal pathology, and therefore likely represents a general mechanism supporting functional compensation for an underlying inefficiency of neural processing in these circuits. The reduced activation of dorsolateral prefrontal cortex likely represents the inadequate readiness of stuttering speakers to execute a sequence of motor responses.
authors.affiliation: Department of Psychiatry, The New York State Psychiatric Institute, Columbia College of Physicians and Surgeons, New York, New York, United States of America.
authors.forename: Jie
authors.initials: J
authors.lastname: Liu
authors.affiliation: Department of Psychiatry, The New York State Psychiatric Institute, Columbia College of Physicians and Surgeons, New York, New York, United States of America.
authors.forename: Zhishun
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Psychiatry, The New York State Psychiatric Institute, Columbia College of Physicians and Surgeons, New York, New York, United States of America.
authors.forename: Yuankai
authors.initials: Y
authors.lastname: Huo
authors.affiliation: Department of Psychiatry, The New York State Psychiatric Institute, Columbia College of Physicians and Surgeons, New York, New York, United States of America.
authors.forename: Stephanie M
authors.initials: SM
authors.lastname: Davidson
authors.affiliation: Department of Psychiatry, The New York State Psychiatric Institute, Columbia College of Physicians and Surgeons, New York, New York, United States of America.
authors.forename: Kristin
authors.initials: K
authors.lastname: Klahr
authors.affiliation: American Institute for Stuttering, New York, New York, United States of America.
authors.forename: Carl L
authors.initials: CL
authors.lastname: Herder
authors.affiliation: American Institute for Stuttering, New York, New York, United States of America.
authors.forename: Chamonix O
authors.initials: CO
authors.lastname: Sikora
authors.affiliation: Department of Psychiatry, The New York State Psychiatric Institute, Columbia College of Physicians and Surgeons, New York, New York, United States of America.
authors.forename: Bradley S
authors.initials: BS
authors.lastname: Peterson
mesh_terms: D000293:Adolescent; D000328:Adult; D001921:Brain / Q000503:physiopathology*; D001931:Brain Mapping; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012720:Severity of Illness Index; D013342:Stuttering / Q000175:diagnosis* / Q000503:physiopathology*; D055815:Young Adult