Is schizotypy taxonic? Response to

Beauchaine, Lenzenweger, and Waller (2008) criticize our taxometric study of schizotypy (Rawlings, Williams, Haslam, & Claridge, in press) on a variety of methodological and philosophical grounds. We argue that their critique selectively applies more stringent standards to our work than to studies supporting their view that schizotypy is taxonic (i.e., categorical). Many of their criticisms apply at least equally to existing studies that offer support for a schizotypy taxon, and these studies are vulnerable to biases favouring taxonic conclusions that were controlled for in our study. Contrary to their criticisms, we did not claim to have disconfirmed previous taxonic findings about schizotypy, and our findings positively support dimensional models of schizotypy rather than merely being null results. Similarly, our findings are not artefacts of the sampling or measurement decisions that they question. Even well-replicated taxometric findings are not immune to empirical challenge, and evaluation of such challenges must be even-handed.     

Are creativity and schizotypy products of a right hemisphere bias?

Prior research has shown associations between higher creativity (e.g., semantic association, verbal fluency), higher schizotypy (e.g., magical ideation), and relatively stronger right hemisphere laterality measures--when each of the three pairings has been studied individually. Our prior study related creativity and schizotypy to signal detection theory response criterion aspects of laterality. The present study attempted to integrate findings regarding these three constructs and to replicate the signal detection theory laterality results by providing measures of all three constructs in a within subjects design. Participants were 60 undergraduates who completed a test battery including two measures of creativity, three measures of schizotypy, a lateralized lexical decision task, and a dichotic listening task. Results are consistent with individual differences in creativity and schizotypy being partly related to a response criterion favoring right hemisphere, possibly nonconscious, processing. Dichotic listening results revealed a strong association of better right hemisphere (left ear) localization ability and creativity.     

Increased distractibility in schizotypy: Independent of individual differences in working memory capacity?

Individuals with schizophrenia typically show increased levels of distractibility. This has been attributed to impaired working memory capacity (WMC), since lower WMC is typically associated with higher distractibility, and schizophrenia is typically associated with impoverished WMC. Here, participants performed verbal and spatial serial recall tasks that were accompanied by to-be-ignored speech tokens. For the few trials wherein one speech token was replaced with a different token, impairment was produced to task scores (a deviation effect). Participants subsequently completed a schizotypy questionnaire and a WMC measure. Higher schizotypy scores were associated with lower WMC (as measured with operation span, OSPAN), but WMC and schizotypy scores explained unique variance in relation to the mean magnitude of the deviation effect. These results suggest that schizotypy is associated with heightened domain-general distractibility, but that this is independent of its relationship with WMC.     

Anomalous experiences and schizotypy: which comes first? The Hermit Crab syndrome hypothesis

This study confirms findings of previous research as they state that some triggering events or anomalous experiences can give rise to a disruption of cognitive processes and emotional changes in a predisposed person. Furthermore, our research states that the cognitive process and change of world view (paradigm shift (PS)) accompanying some paranormal experiences (PEs) could facilitate the development of a schizotypal personality structure. For the purposes of this study, 675 young people aged between 13 and 25 years old (M?=?16.8, SD?=?1.9) completed the Schizotypal Personality Questionnaire, the Revised and Modified Paranormal Belief Scales, the measurement of eight kinds of PE and a self-reported measurement of change of world view. The results confirm the mediating role of PS between paranormal practices and schizotypy as the cognitive process contributing to symptom formation as well as to symptom maintenance. The said results also confirm the existence of cognitive–emotional stages, also called Hermit Crab syndrome, in the process of the “paranormalisation” of reality.     

Relationships between conspiracy mentality,hyperactive agency detection,and schizotypy: Supernatural forces at work?

We examined whether belief in conspiracy theories is predicted by an overactive tendency to perceive agency in the environment, and hypothesized that this association is especially robust among high-schizotypy individuals. Samples of undergraduates (n = 209) and conspiracist website visitors (n = 37) completed measures of conspiracy mentality, hyperactive agency detection, and schizotypy. Correlation analysis indicated significant positive relationships between all pairs of variables in both groups. Multiple regression analysis showed that schizotypy is incrementally predicted by conspiracy mentality and hyperactive agency detection, with chi-square analysis revealing a significant tendency for high-schizotypal individuals to score higher on both variables. Heightened uncertainty about causally ambiguous subjective experiences likely predisposes schizotypals to greater hyperactive agency detection, thereby increasing the probability of conspiracy thinking. Findings are linked to ideological and theoretical differences between secular and supernatural conspiracist beliefs, which are readily apparent in conspiracist literature and communities, and bring into question the homogeneity of the conspiracy mentality construct.