Temperament - A person's distinctive mood, response to stimulation and energy level.
Token economy - A behavioral therapeutic technique based on the principles of operant conditioning in which appropriate behavior is rewarded with tokens, which are later exchanged for desired objects and events.
Trait - According to Eysenck, the trait is a collection of habitual responses that are in some way related to each other, that have some consistency.
Twin-study method - A procedure for examining the role of genetics on personality in which pairs of monozygotic and dizygotic twins are compared.
Type - According to Eysenck, traits that are related to each other combine to make up a type. Note that Eysenck's use of "type" is quite particular: by "type" he means a broad dimension of personality, not a kind of