This study examined some of the predictions made by cognitive models of psychosis, specifically the potential contribution of appraisals and trauma to the development of "need for care." Two groups reporting psychotic-like experiences with and without a "need for care" were compared on types of experiences, appraisals of these experiences, distress, and trauma. Both groups reported similar overall levels of psychotic-like experiences, but were characterized by distinct types of experiences. The clinical group was more distressed, endorsed more externalizing and personalizing appraisals, and fewer psychological/normalizing apraisals of their experiences than the nonclinical group. Both groups showed high rates of trauma, and interpersonal trauma was associated with more personalizing and fewer psychological/normalizing appraisals. These results suggest that "need for care" is characterized by distress and personalizing appraisals, but not by a higher incidence of trauma. The role of interpersonal trauma, specifically, may be to predispose to a "paranoid" world view.

Aims: This study aimed to establish and compare the effects of brief sensory deprivation on individuals differing in trait hallucination proneness.Method: Eighteen participants selected for high hallucination proneness were compared against 18 participants rating low on this trait. The presence of psychotic-like experiences (PLEs), and participants’ cognitive appraisals of these, was evaluated in three different settings: at baseline, in a “secluded office” environment, and in light-and-sound sensory deprivation.Results: Psychotic-like experiences were experienced significantly more often in sensory deprivation for both groups. In particular, both experienced slight increases in perceptual distortions and anhedonia in seclusion, and these increased further during sensory deprivation. Highly hallucination prone individuals showed a significantly greater increase in perceptual distortions in sensory deprivation than did non-prone individuals suggesting a state-trait interaction. Their appraisals of these anomalous experiences were compared to both clinical and non-clinical individuals experiencing psychotic symptoms in everyday life.Conclusion: Short-term sensory deprivation is a potentially useful paradigm to model psychotic experiences, as it is a non-pharmacological tool for temporarily inducing psychotic-like states and is entirely safe at short duration. Experiences occur more frequently, though not exclusively, in those at putative risk of a psychotic disorder. The appraisals of anomalous experiences arising are largely consistent with previous observations of non-clinical individuals though importantly lacked the general positivity of the latter.