Striatal volumes and dyskinetic movements in youth at high-risk for psychosis.
Although dyskinesias may be one of the first behavioral indicators of progressive striatal dysfunction, a mechanism critically implicated in the pathogenesis of psychotic disorders, little is known about the association between striatal structures and abnormal movements in high-risk populations. Thirty participants with a prodromal syndrome were rated for dyskinetic movements and underwent structural magnetic resonance imaging (MRI). Volumes of striatal brain structures were delineated. Elevated hyperkinetic movements were found to be associated with smaller putamen and results were replicated in the antipsychotic naïve portion of the sample. Participants who converted over a 2-year follow-up period showed significantly smaller striatal volumes and a trend towards elevated dyskinetic movements, relative to those who did not convert. Movement abnormalities may reflect a striatal pathology that is present before formal psychosis onset, and potentially reflective of a heightened vulnerability for conversion.
Mittal
Vijay A
VA
Department of Psychology and Neuroscience, University of Colorado, Boulder, USA. vijay.mittal@colorado.edu
Daley
Melita
M
Shiode
Marisa F
MF
Bearden
Carrie E
CE
O'Neill
Joseph
J
Cannon
Tyrone D
TD
D000293:Adolescent; D003342:Corpus Striatum / Q000473:pathology; D020820:Dyskinesias / Q000209:etiology*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D011569:Psychiatric Status Rating Scales; D011618:Psychotic Disorders / Q000150:complications* / Q000473:pathology*; D012307:Risk Factors; D012720:Severity of Illness Index; D018709:Statistics, Nonparametric; D055815:Young Adult