Attachment studies by Harry Harlow showed that infant monkeys separated from their mothers preferred to cling to a surrogate mother that

While auditory stimuli can influence behavior, Harlow's research specifically highlighted the importance of physical comfort over sound. The infant monkeys did not show a significant preference for a surrogate based solely on sound production, indicating that emotional attachment is more closely tied to tactile experiences.

Although food is essential for survival, Harlow's findings revealed that the need for emotional security superseded the need for nourishment. The infant monkeys often chose to cling to the cloth surrogate rather than the wire mother that provided food, demonstrating that comfort and security play a pivotal role in attachment.

Similar to food, the provision of water is a basic necessity but does not fulfill the emotional needs of the infants. Harlow's experiments emphasized that the physical presence and texture of a comforting surrogate were far more influential in forming attachment than the availability of basic resources like water.

The wire mother served as a functional source of food, but the lack of comfort made it less appealing to the infant monkeys. This choice reinforced Harlow's conclusion that the preference for a nurturing, soft, and comforting figure was paramount to the infant's emotional development.