mother/Lorenz, goslings followed who they imprinted on, critical period, LT effects

wire monkeys, one cloth-covered, when afraid - cloth monkey, contact comfort, LT effects

chicks imprinted on gloves, males tried mating, predisposition to imprint on moving object

animal attachments mirrored in studies of humans, feeding isn't basis of attachment

chickens that mated with gloves - normal sexual behaviour, after time with own species

monkey's heads were different, cloth-covered's was more attractive, lack internal validity

later difficulties forming relationships, study created lasting emotional harm