Ainsworth worked with Bowlby on the development of attachment theory. Her particular contribution was to
produce a method, still used today, to assess the strength
of attachment between an infant and others.
She measured the quality of infant attachment with the caregiver by placing them in different situations
A sample of 100American middle class infants aged 12- 18 months were used
Ainsworth used a controlled observation in a laboratory setting and observed the infants and mothers behaviour in 8 different stages
Procedure Controlled observation designed to measure the security
of attachment between a child and their caregiver
A two-way mirror was used to observe behaviour
Behaviours used to judge attachment were as follows:
✓ Proximity seeking – an infant with a good attachment will
stay close to the caregiver
✓ Exploration and secure-base behaviour – good
attachment enables a child to feel confident to explore
and they use their caregiver as a secure base, where
they feel safe
Procedure Behaviours used to judge attachment were as follows:
✓ Stranger anxiety – one of the signs of being closely
attached is a display of anxiety when a stranger
approaches
✓ Separation anxiety – one of the signs of being closely
attached is to be angry/upset when separated from
caregiver
✓ Response to reunion – how they react when their
caregiver comes back
STAGE 1 Caregiver
and infant
go into
unfamiliar
playroom.
The child is
placed on
the floor
and is free
to explore
the toys
Tests exploration and secure
-base
behaviour
Stage 2 - mom is in the room and stranger enters the stranger briefly talks to caregiver and attempts to play with the infant
This tests stranger anxiety
Stage 3 the caregiver leaves the room and the stranger interacts with the infant
Tests separation and stranger anxiety
Stage 4 the caregiver returns to the room
Tests reunion behaviour and secure base behaviour and exploration
Stage 5 everyone leaves and infants alone in the room
Tests separation anxiety
Stage 6 the stranger returns
Tests stranger anxiety
Stage 7 caregiver returns and is reunited with the child this tests reunion behaviour
Securely Attached Would explore the
unfamiliar room and use the
mother as a safe base to
explore the environment
Distressed when mother
leaves
Avoidant of stranger when
alone but friendly when the
mother is present.
Positive and happy when
mother returns.
Insecure-Avoidant ➢ Infants did not orientate towards the mother while
investigating the room and toys
➢ Infant shows no sign of distress when mother leaves
➢ Infant avoided the stranger and plays normally when
stranger is present, therefore did not seem concerned
when mother is absent
➢ Infant shows little interest when mother returns.
➢ Mother and stranger are able to comfort infant equally
well
Insecure-Resistant ➢ Showed intense distress, particularly when
their mother was absent
➢ Infant avoids the stranger showing fear of
the stranger
➢ Child approaches mother when she returns
but resists contact, may even push her away
➢ Infant cries more and explores less than the
other 2 types
Findings: Ainsworth found that there was one attachment type that was
most common among American
children which was 66% secure attachment
22% insecure attachment
12%insecure resistant
Efficient: could measure a lot of behaviours quite quickly
and easily bring in lots of
participants
Easy to replicate
✓No demand characteristics
from baby
Validity: location is different from infant’s normal environment.
Demand characteristics from mum
Generalisations: findings of this study are restricted to it’s sample
type (middle-class Americans
What is a limitation of the strange situation study?
It has low external validity due to its artificial environment.