The influence of personal BMI on body size estimations and sensitivity to body size change in anorexia spectrum disorders.

Cornelissen, Katri, Bester, Andre, Cairns, Paul, Tovee, Martin and Cornelissen, Piers (2015) The influence of personal BMI on body size estimations and sensitivity to body size change in anorexia spectrum disorders. Body Image, 13. pp. 75-85. ISSN 1873-6807

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Official URL: http://dx.doi.org/10.1016/j.bodyim.2015.01.001

Abstract

In this cross-sectional study, we investigated the influence of personal BMI on body size estimation in 42 women who have symptoms of anorexia (referred to henceforth as anorexia spectrum disorders, ANSD), and 100 healthy controls. Low BMI control participants over-estimate their size and high BMI controls under-estimate, a pattern which is predicted by a perceptual phenomenon called contraction bias. In addition, control participants' sensitivity to size change declines as their BMI increases as predicted by Weber's law. The responses of women with ANSD are very different. Low BMI participants who have ANSD are extremely accurate at estimating body size and are very sensitive to changes in body size in this BMI range. However, as BMI rises in the ANSD participant group, there is a rapid increase in over-estimation concurrent with a rapid decline in sensitivity to size change. We discuss the results in the context of signal detection theory.

Item Type: Article
Uncontrolled Keywords: over-estimation, signal detection theory, anorexia nervosa
Subjects: C800 Psychology
Department: Faculties > Health and Life Sciences > Psychology
Depositing User: Ay Okpokam
Date Deposited: 03 Mar 2015 10:00
Last Modified: 28 Oct 2017 11:42
URI: http://nrl.northumbria.ac.uk/id/eprint/21521

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