(1) A sub-class under vital activities.
(2) Activities of individuals, as distinguished from
(a) Activities of social groups (sociology).
(b) Activities of single organs (physiology).
(3) Either conscious, or closely related to conscious activities.
(4) May be activities of human or animal, adult or child, normal or abnormal individuals.
B. Problems of psychology:
(1) How individuals differ in their mental activities.
(2) How individuals are alike in their mental activities.
(3) Practical applications of either (1) or (2).
C. Methods of psychology:
(1) Methods of observing mental activities.
(a) Introspective, the observing by an individual of his own actions.
(b) Objective, the observation of the behavior of other individuals.
(2) General lines of attack upon psychological problems.
(a) Experimental: vary the conditions and see how the mental activity changes.
(b) Comparative: test different individuals or classes and see how mental activity differs, etc.
(c) Genetic: trace mental development.
(d) Pathological: examine mental decay or disturbance.