Sears et al - hunger is a primary drive for infants, and caregivers reduce hunger, meaning attachment is a secondary drive
Learning theory: Strength
There have been new developments with 'social learningtheory'.Hay and Vespo suggest parents teach children to love by performing attachment behaviour then positively reinforcing behaviours with praise. Shows SLT doesn't have to rely on cupboard love and can be seen as a convincingexplanation for attachment.
Learning Theory: Weakness
There is a lack of support from animal studies, e.g. Lorenz's geese imprinted before they were fed, suggesting feeding isn't crucial to attachment.
Learning Theory: Weakness
Schaffer and Emerson's research showed a majority of attachment to mothers, despite the babies being fed by other caregivers, suggesting food is not the main factor in the formation of humanattachments.