Harlow And Zimmerman (1959)

Question 1

Procedure

Answer 1

• 8 rhesus monkeys
• 4 fed by a cloth surrogate mother
• 4 fed by wire surrogate mother

Question 2

Findings

Answer 2

• regardless of which produced food, ALL monkeys preferred the cloth mother
• all spent less than 2/24 hours on wire mother

Question 3

Conclusions

Answer 3

Contact comfort is critical in development of attachment, not food