he conducted the strange situation procedure using Japanese children. he used a sample of 60 middle class infants aged 1 year old, both boys and girls, alongside their mothers. all the children were raised at home. he found that 68 % were classified as securely attached, similarly to the american version. however, there were no infants classified as avoidant - insecure and 32 % were classified as resistant insecure. this shows that there are cultural differences. japanese children had much higher seperation anxiety.