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activities adolescence adulthood adults aggression average B. F. Skinner babies become bedwetting behavior believe Binet biological birth bottle boys breast-fed breast-feeding called capacity cause child childbirth childhood childrearing cocaine concept conditioning creative crying cues developmental divorce early educational effect enuresis environment equal example experiment experimental factors fathers fear females fraternal twins Freud Freudian girls heredity hormone human increase individual infants influence instance intelligence interaction investigated IQ test learning less males maturation ment mental months Moro reflex mothers observed occur oral stage ovum pain parents perhaps period person physical Piaget play practice predict psychological psychologists psychosexual stages reflex reported response reward and punishment Rosalie Rayner secondary rewards sex roles sex-role sexual siblings sleep social stage stimulus studies subjects sucking task teach teacher thought thumbsucking tion toilet training toys twins urination verbal women words