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  • Title: Evidence for a specific link between the personality trait of absorption and idiopathic environmental intolerance.
    Author: Witthöft M, Rist F, Bailer J.
    Journal: J Toxicol Environ Health A; 2008; 71(11-12):795-802. PubMed ID: 18569578.
    Abstract:
    Absorption as a personality trait refers to the predisposition to get deeply immersed in sensory (e.g., smells, sounds, pictures) or mystical experiences, that is, to experience altered states of consciousness. Absorption is markedly related to constructs openness to experiences, hypnotic suggestibility, imagination, and dissociation. Although absorption was hypothesized to be a risk factor for medically unexplained symptoms (MUS), the construct has yet not been investigated in individually suffering from idiopathic environmental intolerance (IEI), formerly better known as multiple chemical sensitivity (MCS). IEI is a complex condition marked by MUS, which patients attribute to various chemical substances that are typically detectable by their odor (e.g., exhaust emissions, cigarette smoke). The current study investigated whether IEI was related to the personality trait of absorption. In a longitudinal study, 54 subjects with IEI were compared to 44 subjects with a somatoform disorder (SFD), but without IEI, and 54 subjects with neither SFD nor IEI (control group, CG). Self-report measures of somatic symptoms, severity of IEI, and level of absorption were collected both at a first examination and 32 mo later. On both assessments, subjects with IEI and individuals with SFD reported similar highly elevated levels of MUS, compared to CG. In contrast to SFD, IEI was specifically related to elevated absorption scores. IEI was specifically associated with a tendency to experience self-altering states of consciousness. Since absorption is related to both openness to unusual experiences and elevated imaginative involvement, absorption might contribute to IEI via two routes by (1) enhancing the susceptibility for IEI-specific convictions and (2) fostering classical conditioning processes of MUS via enhanced cognitive-imaginative representations of assumed IEI triggers.
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