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Strengths
+ Conditioning is involved but not necessarily in the form of food - infant associates comfort with a caregiver, forming the attachment
Weaknesses
- Counter-evidence from animal studies counters importance of food - Harlow's monkey's and Lorenz' geese
- Counter-evidence from human baby studies - Schaffer & Emerson found babies attached to mother regardless if she was the one who fed them and Isabella found importance of caregiver interactions