- same monkey study as for Bowlby
- after separation, put baby monkeys into cage with "cloth mother" and "wire mother"
- wire mother was cold, hard, uncomfortable, unrealistic face, but had a bottle of milk. Cloth mother was padded and comfortable, more realistic face, but no food
- observed baby monkeys to see with "mother" they bonded with (scared them by putting noisy toy in and seeing which "mother" they ran to)
- found that monkeys spent all their time with cloth mother, and just fed off wire mother.
THEREFORE food is not the most important thing, it's about contact/comfort