some mothers might have been less sensitive to their infant’s protests and would’ve been less likely to report them
systematic bias which would challenge the validity of the data
biased sample
working-class population
sample from 1960s
parental care of children changed considerably since that time
more women go out to work, children cared for outside the home, fathers stay at home and become main carer.
Cohn et al - men who choose to stay home and take care of family quadrupled over the past 25 years
challenging monotropy
Bowlby - infant forms one special emotional relationship. secondary attachments important as emotional safety net or to meet other needs.
Rutter - all attachment figures are equivalent, all attachments being integrated to produce an infant’s attachment type.
cultural variations
individualist cultures - everyone in society concerned with their own needs and the needs of their immediate family group.
collectivist cultures - people more concerned with the needs of the group rather than the needs of individuals. share things like possessions and childcare.
Sagi et al - attachments in infants raised in family based sleeping arrangements and infants raised in communal environments. closeness of attachment with mother almost twice as common in family-based arrangements than in the communal environment.
stage theories
problem is they suggest development is inflexible
proposes that there is a fixed order for development.
e.g. suggests that single attachments come before multiple attachments, in some situations and cultures this is incorrect.