Final answer:
Self-deception is a psychological phenomenon that people engage in to enhance their health and performance. It involves various cognitive biases and techniques such as changing behavior, rationalizing or denying cognitions, and adding new beliefs.
Step-by-step explanation:
Self-deception is a complex psychological phenomenon that involves various cognitive biases and techniques. People engage in self-deception to enhance their health and performance by changing their behavior, rationalizing or denying their cognitions, or adding new beliefs. Compliance techniques, projection, the need for closure, anthropomorphism, and hallucinations can all contribute to self-deception.