Symbols and sign stimuli.
D000818:Animals; D001290:Attitude; D001522:Behavior, Animal; D001717:Birds; D005260:Female; D005364:Field Dependence-Independence; D006801:Humans; D007173:Imprinting, Psychological; D008297:Male; D010465:Perception; D011574:Psychoanalytic Theory; D011582:Psychological Theory; D011606:Psychosexual Development; D012727:Sex Characteristics; D012725:Sexual Behavior; D012726:Sexual Behavior, Animal; D013561:Symbolism