Probability and conspiratorial thinking

Conspiracy theories as alternative explanations for events and states of affairs enjoy widespread popularity. We test one possible explanation for why people are prone to conspiratorial thinking: We hypothesize that conspiratorial thinking as an explanation for events increases as the probability of those events decreases. In order to test this hypothesis, we have conducted five experiments in which participants were exposed to different information about probabilities of fictional events. The results of all experiments support the hypothesis: The lower the probability of an event, the stronger participants embrace conspiratorial explanations. Conspiratorial thinking, we conclude, potentially represents a cognitive heuristic: A coping mechanism for uncertainty.     

Boris Chasanow – Writer in Freedom? Herkommen und Vertreibung: Zwei Millennien

Studies in East European Thought -     

A Comparison of New and Revised Rorschach Measures of Schizophrenic Functioning in a Serbian Clinical Sample

We empirically evaluated indexes derived from the Rorschach Comprehensive System (CS) and the Rorschach Performance Assessment System (R–PAS) that are used for the assessment of psychotic functioning in schizophrenia. We compared the Perceptual Thinking Index (PTI) and the Ego Impairment Index (EII–2) with their revised versions: Thought and Perception Composite (TP–Comp) and EII–3. We evaluated their predictive validity for differentiating schizophrenic from nonschizophrenic patients in a Serbian sample. The sample consisted of 211 (109 men and 102 women, 18–50 years old) inpatients in Serbia who were divided into 2 groups: schizophrenic (100) and nonschizophrenic (111). Test administration, coding, and form quality classification followed CS guidelines. Logistic regression analysis indicated that the new indexes TP–Comp and EII–3 have slightly better predictive power than their counterparts, PTI and EII–2, in identification of schizophrenia, and that TP–Comp performed better than other indexes, although all 4 indexes were successful in differentiating these groups. The results supported the use of TP–Comp in diagnosis of schizophrenia and generally provided evidence for the utility of the Rorschach in evaluating psychosis and for its use in a cross-national context.     

A viewpoint-independent process for spatial reorientation

Reorientation tasks, in which disoriented participants attempt to relocate objects using different visual cues, have previously been understood to depend on representing aspects of the global organisation of the space, for example its major axis for judgements based on geometry. Careful analysis of the visual information available for these tasks shows that successful performance could be based on the much simpler process of storing a visual ‘snapshot’ at the target location, and subsequently moving in order to match it. We tested 4-8-year olds on a new spatial reorientation task that could not be solved based on information directly contained in any retinal projection that they had been exposed to, but required participants to infer how the space is structured. Only 6-8-year olds showed flexible recall from novel viewpoints. Five-year olds were able to recall locations given movement information or a unique proximal landmark, but without these they could not do so, even when they were not disoriented or when the landmark was a familiar object. These results indicate that early developing spatial abilities based on view matching and self motion are supplemented by a later-developing process that takes into account the structure of spatial layouts and so enables flexible recall from arbitrary viewpoints.     

Language comprehension vs. language production: age effects on fMRI activation

Normal language acquisition is a process that unfolds with amazing speed primarily in the first years of life. However, the refinement of linguistic proficiency is an ongoing process, extending well into childhood and adolescence. An increase in lateralization and a more focussed productive language network have been suggested to be the neural correlates of this process. However, the processes underlying the refinement of language comprehension are less clear. Using a language comprehension (Beep Stories) and a language production (Vowel Identification) task in fMRI, we studied language representation and lateralization in 36 children, adolescents, and young adults (age 6-24 years). For the language comprehension network, we found a more focal activation with age in the bilateral superior temporal gyri. No significant increase of lateralization with age could be observed, so the neural basis of language comprehension as assessed with the Beep Stories task seems to be established in a bilateral network by late childhood. For the productive network, however, we could confirm an increase with age both in focus and lateralization. Only in the language comprehension task did verbal IQ correlate with lateralization, with higher verbal IQ being associated with more right-hemispheric involvement. In some subjects (24%), language comprehension and language production were lateralized to opposite hemispheres.