Perception is the process by which individuals assign meaning to their environment and it may differ from objective reality. It is influenced by factors within the target, perceiver, and situation. There are key differences between sensation, which deals with basic physiological responses, and perception, which involves cognitive processing of sensory information. People form self-concepts consisting of their self-beliefs and evaluations. These self-concepts can be positive through self-enhancement or reinforced through social interactions. Attribution theory seeks to explain how and why people make causal explanations for behaviors. Common biases include overemphasizing dispositions over situations and taking credit for successes but blaming failures on external factors.