The primary aim is to understand how confidence abnormalities contribute to the core symptoms of psychiatric disorders and inflexible/compulsive thoughts and behaviour. 1) Extending our previous effort to test confidence biases in gambling disorder and obsessive disorder, we will use experiments to test how confidence contributes to abnormal information search and evidence accumulation in participants with either gambling disorder or obsessive-compulsive disorder and healthy controls. We will test how confidence distortions affect information seeking and/or evidence accumulation, building on previous work by Dr. Fleming et al and our own labs. 2) Building on work from the lab of Dr. Desender and our own labs6 we will ask how prior beliefs about one’s ability are related to (abnormal) confidence judgements and how this relates to higher-order self-beliefs such as self-esteem in various subclinical dimensions. Expected Results: 1) An understanding of how confidence biases in gambling disorder and obsessive-compulsive disorder contribute to abnormal information searches. 2) An understanding of the relationships between subclinical dimensions, prior beliefs about ability and higher-order self-beliefs such as self-esteem.