Dollard and Miller (1950) proposed that caregiver-infant attachment can be explained by learning theory. Their approach is sometimes called a 'cupboard love' approach.
It is called the 'cupboard love' approach because it emphasises the importance of the attachment figure as a provider of food. They proposed that children learn to love whoever feeds.
Classical conditioning involves learning to associate two stimuli together so that we begin to respond to one in the same way as we already respond to the other
In the case of attachment, food serves as an unconditioned stimulus
Being fed gives us pleasure - we don't have to learn that, it is an unconditioned response
A caregiver starts as a neutral stimulus, i.e. something that produces no response
However, when the caregiver provides food over time they become associated with food
When the baby then sees this person there is an expectation of food. The neutral stimulus has become a conditioned stimulus
Once conditioning has taken place, the sight of the caregiver produces a conditioned response of pleasure
To a learning theorist this conditioned pleasure response is love, i.e. an attachment is formed and the caregiver becomes an attachment