Abstract

This essay is a plea for the view that philosophers should analyze the concept of self-deception more with the aim of having useful applications for empirical research. This is especially desirable because psychologists often use different, even incompat-ible conceptions of self-deception when investigating the factual conditions and con-sequences, as well as the very existence, of the phenomenon. At the same time, philosophers who exploit psychological research on human cognition and reasoning in order to better understand self-deception fail to realize that these theories and data are loaded with problematic assumptions. More specifically, I discuss what conceptions of rationality are assumed when we describe cases of self-deception as either irra-tional or as adaptively rational, and how competing ontological models of the self ap-pear in different accounts of self-deception. I argue, first, that although the self typically is an object of such deception, it is not always so. Secondly, while it is the subject of deception, it is so only in a moderate way: We need neither assume multi-ple selves, nor is self-deception typically brought about or sustained intentionally. However, the avoidance of self-deception is at least sometimes under the subject’s ra-tional control. This account does not take for granted the existence of the phenomenon of self-deception. It is a serious task of empirical research to figure out whether self-deception really occurs. This issue also depends on the question ignored until now of what normative conception of rationality is assumed when one views certain beliefs as self-deceptive.