Affective, behavioral, and avoidance responses on the visual cliff: effects of crawling onset age, crawling experience, and testing age.
D000339:Affect; D000367:Age Factors; D001362:Avoidance Learning; D001519:Behavior; D006801:Humans; D007223:Infant; D008124:Locomotion; D002666:Psychology, Child / Q000379:methods