Japanese mothers' prebirth adult attachment interview predicts their infants' response to the strange situation procedure: The strange situation in Japan revisited three decades later

The current study investigated the intergenerational transmission of attachment in Sapporo, Japan, using the Adult Attachment Interview (AAI) and the Strange Situation Procedure (SSP). This is the first SSP study in Sapporo in three decades, after a study in the mid-1980s reported controversial results. The SSP distributions found in the current study, however, were similar to those reported in the earlier Sapporo study, including its controversial finding that ambivalent attachment was predominant in insecure infants. The current study used the AAI and the SSP to study the intergenerational transmission of attachment in Japan and found a strong categorical match consistent with those reported elsewhere in the world. A proportion of infants who were judged disorganized as the first report in this Japanese sample was also found to be similar to the reported global norm. Disorganized attachment in Japanese infants was strongly predicted by the mother's unresolved state of mind as was found across normative samples.