Explaining Disease: Correlations, Causes, and Mechanisms

  • Authors:
  • Paul Thagard

  • Affiliations:
  • Philosophy Department, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada (e-mail: pthagard@watarts.uwaterloo.ca)

  • Venue:
  • Minds and Machines
  • Year:
  • 1998

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Abstract

Why do people get sick? I argue that a disease explanation is best thought of as causal network instantiation, where a causal network describes the interrelations amongmultiple factors, and instantiation consists of observational or hypothetical assignment of factors to the patient whose disease is being explained. This paper first discusses inference fromcorrelation to causation, integrating recent psychological discussions of causal reasoning with epidemiological approaches to understanding disease causation, particularly concerning ulcers and lung cancer. It then shows how causal mechanisms represented by causal networks can contribute to reasoning involving correlation and causation. The understanding of causation and causal mechanisms provides the basis for a presentation of the causal network instantiation model of medical explanation.