Questions: introduced the concept of maternal deprivation. Harry Harlow John Bowlby Conrad Lorenz Anton Mesmer

The answer is John Bowlby.

Harry Harlow is known for his research on attachment in rhesus monkeys, particularly his experiments with surrogate mothers. While his work is related to attachment and maternal care, he did not introduce the concept of maternal deprivation.

John Bowlby introduced the concept of maternal deprivation. He developed attachment theory, which emphasizes the importance of a child's relationship with their primary caregiver and the potential negative effects of separation or loss of this bond.

Conrad Lorenz is known for his work on imprinting in animals, particularly geese. His research contributed to the understanding of attachment but did not specifically introduce the concept of maternal deprivation.

Anton Mesmer is known for his work on animal magnetism and is not related to the concept of maternal deprivation or attachment theory.