The relationship between interview-based schizotypal personality dimension scores and the continuous performance test

Area of Science:

• Psychology
• Neuroscience
• Psychiatry

Background:

• Existing research on cognitive performance in subclinical schizotypal personality features relies heavily on self-report measures.
• Self-report questionnaires may be limited by distorted self-awareness of symptoms.
• A need exists for objective cognitive assessments in this population.

Purpose of the Study:

• To investigate the relationship between cognitive performance on a degraded-AX continuous performance test (CPT) and structured clinical interview-based dimensions of schizotypal personality disorder (SPD).
• To compare the utility of interview-based SPD measures versus self-report questionnaires in predicting CPT performance.
• To explore the differential impact of interpersonal and disorganized SPD symptoms on specific types of CPT errors.

Main Methods:

• Fifty-two undergraduate students with subclinical schizotypal personality features participated.
• Cognitive performance was assessed using a degraded-AX continuous performance test (CPT).
• Schizotypal personality disorder (SPD) symptoms were measured using a structured clinical interview, yielding continuous dimension scores, and the Abbreviated Schizotypal Personality Questionnaire.

Main Results:

• Higher overall SPD interview dimension scores positively correlated with both omission and false alarm errors on the CPT.
• Interpersonal SPD symptoms were associated with omission errors, while Disorganized SPD symptoms were associated with false alarm errors.
• Scores from the Abbreviated Schizotypal Personality Questionnaire did not correlate with CPT accuracy, unlike the interview-based measures.

Conclusions:

• Interview-based assessment of schizotypal personality disorder (SPD) dimensions shows a significant association with cognitive performance deficits on the CPT in a subclinical sample.
• Self-report measures of schizotypal personality features may not accurately reflect cognitive performance.
• Specific SPD symptom clusters (interpersonal and disorganized) are differentially related to distinct error types on the CPT, suggesting distinct cognitive mechanisms.