Research has found that Ainsworth missed a 4th type of attachment
Main & Solomon (1986) analysed over 200 Strange Situation videotapes and proposed ‘insecure disorganised’ (Type D)
Lack of consistent patterns of social behaviour – some infants don’t have a consistent type of attachment
Lack coherent strategy for dealing with stress of separation
They show very strong attachmentbehaviour which is suddenly followed by avoidance or looking fearful towards their caregiver
Van Ijzendoorn et al. (1999) supported this with a meta-analysis of 80 studies in the US à found 62% secure, 15% insecure-avoidance, 9% insecure-resistant and 15% insecure-disorganised