Positive and negative schizotypal symptoms relate to different aspects of crossover reaction time task performance

Although the expressions of both positive and negative symptoms in schizophrenia spectrum illnesses can each occur with varying degrees of severity, researchers have often dichotomized patients as generally positive or negative subtypes. Studies of schizophrenia and schizotypal personality disorder...

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Bibliographic Details
Published in:Psychiatry research 1998-11, Vol.81 (2), p.241-249
Main Authors: Sarkin, Andrew J, Dionisio, Daphne P, Hillix, William A, Granholm, Eric
Format: Article
Language:English
Subjects:
Adult
Adult and adolescent clinical studies
Attention
Biological and medical sciences
Delusions - diagnosis
Delusions - psychology
Depression - diagnosis
Depression - psychology
Female
Humans
Male
Medical sciences
Personality disorders
Psychiatric Status Rating Scales
Psychology. Psychoanalysis. Psychiatry
Psychometrics
Psychopathology. Psychiatry
Psychophysiology
Reaction Time
Schizotypal personality disorder
Schizotypal Personality Disorder - diagnosis
Schizotypal Personality Disorder - psychology
Screening study
Students - psychology
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Summary:Although the expressions of both positive and negative symptoms in schizophrenia spectrum illnesses can each occur with varying degrees of severity, researchers have often dichotomized patients as generally positive or negative subtypes. Studies of schizophrenia and schizotypal personality disorder (SPD) have not typically controlled for the severity of the other symptom types when examining the relationship between positive and negative symptom subtypes and cognitive impairment. The present study investigated the relationship between the severity of both symptom types and reaction time crossover task performance in SPD in groups made equivalent on the severity of the other type of symptom. Fifty-eight out of 458 undergraduates were screened into one of four groups (high negative-high positive, low negative-low positive, high negative-low positive or low negative-high positive) by the Schizotypal Personality Questionnaire and assessed with the reaction time crossover task. The results indicated that negative schizotypal symptoms were associated with the early crossover pattern, while positive schizotypal symptoms related to longer overall reaction time. Therefore, different cognitive mechanisms involved in crossover task performance appeared to be associated with different symptom subtypes.
ISSN:0165-1781
1872-7123
DOI:10.1016/S0165-1781(98)00101-2