Movement abnormalities and the progression of prodromal symptomatology in adolescents at risk for psychotic disorders.
The link between movement abnormalities and psychotic disorders is presumed to reflect common neural mechanisms that influence both motor functions and vulnerability to psychosis. The prodromal period leading to psychotic disorders represents both a viable point for intervention and a developmental period that, if studied, could shed light on etiology; however, no published studies have examined the temporal progression of this link. A group with high levels of prodromal symptomatology (i.e., adolescents with schizotypal personality disorder [SPD]; n = 42) and both psychiatric controls (with other personality disorders or conduct disorder [OD]; n = 30) and nonpsychiatric controls ([NC]; n = 49) were recruited. Videotapes of structured psychiatric interviews were coded for movement abnormalities by raters blind to participants' diagnostic status, and follow-up assessments were conducted 1 year later. Controlling for psychotropic medications, the authors found that adolescents with SPD exhibited significantly more motor abnormalities in the face and upper body than did OD and NC controls. At baseline, movement abnormalities were positively correlated with the severity of positive, negative, and total prodromal symptoms. Within the SPD group, baseline movement abnormalities predicted symptom severity 1 year later. Movement abnormalities represent an early risk indicator that may be predictive of later symptom severity and potentially of psychosis onset.
Mittal
Vijay A
VA
Department of Psychology, Emory University, Atlanta, GA 30322, USA. vmittal@emory.edu
Tessner
Kevin D
KD
Trottman
Hanan D
HD
Esterberg
Michelle
M
Dhrub
Shivali H
SH
Simeonova
Diana I
DI
McMillan
Amanda L
AL
Murphy
Erin
E
Saczawa
Mary E
ME
Walker
Elaine F
EF
D000293:Adolescent; D002648:Child; D015897:Comorbidity; D002658:Developmental Disabilities / Q000175:diagnosis / Q000523:psychology; D020820:Dyskinesias / Q000175:diagnosis* / Q000523:psychology; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D010552:Personality Assessment; D010554:Personality Disorders / Q000175:diagnosis / Q000523:psychology; D011618:Psychotic Disorders / Q000175:diagnosis* / Q000523:psychology; D012307:Risk Factors; D012559:Schizophrenia / Q000175:diagnosis*; D012565:Schizophrenic Psychology; D012569:Schizotypal Personality Disorder / Q000175:diagnosis* / Q000523:psychology