Magdalena Antrobus

Optimistically biased beliefs are beliefs about oneself that are more positive than is warranted by the evidence. Optimistically biased beliefs are the result of the influence of cognitive and motivational factors on people’s capacity to acquire, retrieve, and use information about themselves, and they resist counterevidence due to biases in belief updating. From a psychological point of view, optimistically biased beliefs contribute positively to subjective wellbeing, mental health, resilience, motivation, caring behaviour, and productivity. This chapter argues that optimistically biased beliefs also have significant epistemic benefits that could not be easily attained otherwise. In particular, they enhance socialization, leading to both exchanging information with one’s peers and receiving feedback from them, and they support one’s sense of self as that of a competent, largely coherent, and effective agent, helping sustain one’s motivation in the pursuit of one’s goals.

In this paper we have two main aims. First, we present an account of mood-congruent delusions in depression (hereafter, depressive delusions). We propose that depressive delusions constitute acknowledgements of self-related beliefs acquired as a result of a negatively biased learning process. Second, we argue that depressive delusions have the potential for psychological and epistemic benefits despite their obvious epistemic and psychological costs. We suggest that depressive delusions play an important role in preserving a person’s overall coherence and narrative identity at a critical time, and thus can be regarded as epistemically innocent.

Purpose of review: What is the relationship between rationality and mental health? By considering the psychological literature on depressive realism and unrealistic optimism it was hypothesized that, in the context of judgments about the self, accurate cognitions are psychologically maladaptive and inaccurate cognitions are psychologically adaptive. Recent studies recommend being cautious in drawing any general conclusion about style of thinking and mental health. Recent findings: Recent investigations suggest that people with depressive symptoms are more accurate than controls in tasks involving time perception and estimates of personal circumstances, but not in other tasks. Unrealistic optimism remains a robust phenomenon across a variety of tasks and domains, and researchers are starting to explore its neural bases. However, the challenge is to determine to what extent and in what way unrealistic optimism is beneficial. Summary: We should revisit the hypothesis that optimistic cognitions are psychologically adaptive, whereas realistic thinking is not. Realistic beliefs and expectations can be conducive to wellbeing and good functioning, and wildly optimistic cognitions have considerable psychological costs.

In this thesis I propose a new way of understanding depressive illness as not exclusively harmful, but as related to particular, empirically evidenced, epistemic and pragmatic benefits for the subject, alongside the associated costs. For each of the benefits considered, I provide and concisely analyse the empirical evidence both in its favour and against it, suggest ways in which these benefits could apply in the circumstances presented, discuss some outstanding problems for that application as stated, and describe potential implications. The issues discussed involve topics in cognitive psychology as well as in ethics, which I regard as complementary to the debate. I take the view that depression related phenomena such as low mood, low self-esteem, and mood-congruent delusions offer potential benefits to a subject under certain circumstances, but not under others. In discussing the hypotheses presented, I argue for a more complex view of depression, which includes its potential epistemic and pragmatic benefits as well as its costs and I propose possible directions for future research.