If greater than 0. 05, its due to chance. Freud"s perso(cid:374)ality theory: factors that influences behaviour. Biological influences: genetic predispositions, genetic mutations, natural selection of adaptive physiology and behaviours, genes responding to the environment. Psychological influences: learned fears and other learned expectations, emotional responses, cognitive processing and perceptual interpretation. Life instinct: survival of biological means, sexual energy. Death instinct: aggression to oneself, structures of personality. Id: contains the instincts, only structure present at birth, unconscious and has no content with reality. Irrational: strives for immediate gratification, based on the (cid:862)pleasure pri(cid:374)(cid:272)iple(cid:863) Ego: develops at about 13-15 months. In contact with reality and helps the id becomes satisfied in socially acceptable ways: strives for delay of gratification, based o(cid:374) the (cid:862)reality pri(cid:374)(cid:272)iple(cid:863) Super ego: develops around 4 years of age, allows for self-control, seeks perfection, tries to block all gratification, based o(cid:374) the (cid:862)(cid:373)oral pri(cid:374)(cid:272)iple(cid:863) Sexual = refers to many urges for physical pleasure.