Dollard & Miller (1950) proposed the Learning Theory of Attachment
The learning theory of attachment states that we only attach to those who feed us, and is formed through classical and operant conditioning
Food is an unconditional stimulus which evokes pleasure and the carer is a neutral stimulus who becomes a conditioned stimulus through classical conditioning
Crying is a negative reinforcer as it encourages the carer to feed the baby
Smiling is a positive reinforcer so encourages the carer to feed the baby to evoke more reward
Lorenz's study does not support Learning Theory as the geese imprint on the first thing they see; it does not involve food
Harlow's study does not support Learning Theory as the monkeys value comfort over food
Shaffer & Emerson's study does not support Learning Theory as the PCG is not the one to feed the baby every time, and stage 4 shows that multiple attachments can form - the first one may not be unique