Personality involves several factors:
– Instinctual drives – food, sex, aggression
– Unconscious processes
– Early childhood influences (re: psychosexual stages) – especially the parents
Personality development depends on the interplay of instinct and environment during the first five years of life. Parental behavior is crucial to normal and abnormal development. Personality and mental health problems in adulthood can usually be traced back to the first five years.