Investigating the role of action-contingent expectancy biases in dysphoria-linked activity engagement behavioural choice.

Reduced tendency to engage in potentially rewarding activities is a hallmark of depression. The present study investigated the role of future expectancy biases in depression-linked behavioural choice, in participants varying in self-reported depression symptoms (dysphoria). A novel laboratory paradigm was developed to test the hypotheses that the degree to which higher dysphoria is associated with reduced tendency to engage in a potentially rewarding activity is dependent on the presence of negative biases in the expected outcomes of activity engagement. Specifically, two types of expectancy biases were distinguished: a) the expected likelihood of a negative rather than positive outcome, and b) the expected emotional impact of either outcome. N = 176 undergraduate students with varied levels of dysphoria were given the opportunity to choose to engage in a coin-tossing game that could result in a win or loss monetary outcome in terms of charity donations, and then rated both types of expectancies. Results indicated that higher dysphoria was associated with more negative expectations concerning the likelihood of objective outcomes and the emotional impact of such outcomes, and as hypothesised, such negative expectancy biases mediated indirect associations between dysphoria and behavioural choice.