used 4 experimental conditions (cloth mother w food and wire mother w food, cloth mother w food, wire mother w food, cloth mother no food and wire mother w food, cloth mother w food and wire mother no food). The time that the monkeys spent with each mother was recorded. The monkeys always spent more time with the cloth mother when she was available, otherwise they showed signs of distress (diarrhoea). When placed in a larger cage to observe exploration, monkeys with the cloth mother explored more which is a sign of emotional security. When startled by a loud noise, the monkeys would always flee to the cloth mother when available. This implies that baby monkeys innately seek out comforting primary caregivers rather than primary caregivers who provide them with food.