Dirk van Kampen

A short form of the Dimensional Assessment of Personality Pathology-Basic Questionnaire (DAPP-BQ): the DAPP-SF.

A short form of the Dimensional Assessment of Personality Pathology-Basic Questionnaire (DAPP-BQ), called the DAPP-SF, is presented, consisting of 136 of the original 290 items. It was established in a community sample that the factor structure of the DAPP-SF is highly congruent with the structure of the DAPP-BQ. The 18 DAPP-SF scales, which were found to be highly reliable, turned out to correlate substantially with the DAPP-BQ scales, even after applying a necessary correction, as the DAPP-SF was developed in the same sample used to investigate the Dutch DAPP-BQ. The higher-order convergent validity of the DAPP-SF was demonstrated by correlating the DAPP-SF scales and factors with Van Kampens 5DPT. The same factor structure as found in the community sample of patients with personality disorder, also demonstrating that the agreement between the DAPP-SF and the DAPP-BQ is not dependent on the use of shared data. Finally, following Bagge and Trull [Bagge, C.L., Trull, T.J., 2003. DAPP-BQ: Factor structure and relations to personality disorder symptoms in a non-clinical sample. Journal of Personality Disorders 17, 19-32], specific predictions were tested concerning differences in means on the 18 scales between 10 diagnostic groups in the sample of patients with personality disorder. Results supported the validity of the DAPP-SF with respect to its lower-order structure. Finally, for practical purposes, preliminary norms are presented for females and males from the community in two different age groups.

The Schizotypic Syndrome Questionnaire (SSQ): Psychometrics, validation and norms.

This paper examines the psychometric properties (reliability and factor structure) and validity (relationship with various self-report measures and SPEM dysfunction) of the SSQ or Schizotypic Syndrome Questionnaire, a 108-item inventory for the measurement of 12 prodromal or schizotypic symptoms present in Van Kampens model of schizophrenic prodromal unfolding. This paper also provides normative data for the SSQ. The SSQ demonstrates adequate reliability and breaks down into three correlated factors: negative schizotypy, asocial schizotypy and positive schizotypy. Results further attest the construct validity of the instrument. Because of the implications of the SSQ model for the definition of schizophrenia, the instruments three-dimensional factor structure and the nature of one of the factors are discussed in more detail.

Positive schizotypy scores correlate with left visual field interference for negatively valenced emotional words: A lateralized emotional Stroop study

Fourteen men scoring high and 14 men scoring low on a positive schizotypy scale participated in a lateralized emotional Stroop task. Vocal reaction times for color naming of neutral, positive and negative emotional words were recorded. Across participants, the color naming of neutral and emotional words was slightly faster to right than to left visual field presentations. In men with high scores on positive schizotypy, the presentation of negative words to the left visual field (right hemisphere) resulted in significant affective interference with color naming, which was significantly larger than in men with low scores. Correlational analysis also showed that positive schizotypy was significantly associated with emotional interference in response to LVF negative words. The outcome is discussed in terms of right hemispheric engagement in negative emotions in high positive schizotypic men.Fourteen men scoring high and 14 men scoring low on a positive schizotypy scale participated in a lateralized emotional Stroop task. Vocal reaction times for color naming of neutral, positive and negative emotional words were recorded. Across participants, the color naming of neutral and emotional words was slightly faster to right than to left visual field presentations. In men with high scores on positive schizotypy, the presentation of negative words to the left visual field (right hemisphere) resulted in significant affective interference with color naming, which was significantly larger than in men with low scores. Correlational analysis also showed that positive schizotypy was significantly associated with emotional interference in response to LVF negative words. The outcome is discussed in terms of right hemispheric engagement in negative emotions in high positive schizotypic men.

Prodromal unfolding: the validation of the Schizotypic Syndrome Questionnaire model in a sample of first-episode schizophrenic patients.

Aim: Validation of Van Kampens Schizotypic Syndrome Questionnaire (SSQ) model of schizophrenic prodromal unfolding. The SSQ model comprises 12 negative, asocial and psychotic‐like symptoms that are hypothesized to determine each other in terms of cause and effect.