Bowlby's monotropic theory a

• Supporting evidence

  Lorenz's study found critical periods in Geese imprinting.
• Supporting evidence

  Kerns (1994)- found that securely attached infants have high-quality relationships in childhood, whereas insecurely attached infants have friendship difficulties in childhood.
• Limitation of the critical period

  Too rigid and has been replaced by the sensitive period.
• Contradictory evidence

  Schaffer and Emerson- found that infants are attached to multiple caregivers and not just their mothers.
• Other explanations

  E.g. learning theory