Atypical behavior (HP_0000708) is an abnormality in a person's actions that can be controlled or modulated by the will of the individual. While abnormal behaviors can be difficult to control, they are distinct from other abnormal actions that cannot be affected by the individual's will. Also known as: Behavioral abnormality, Behavioral changes, Behavioral disorders, Behavioral disturbances, Behavioral problems, Behavioral symptoms, Behavioral/psychiatric abnormalities, Behavioural abnormality.