The correct answer is tertiary circular reactions. The
tertiary circular reactions often occur between the age of 12-18 months old by
which the child is likely to engage to overt trial and error to problem
solving, the child Is likely to adapt purposefully in order to establish schemes
in specific situations and lastly, the child engages to experimental quality in
his or her behavior.
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Even without complete isolation, the infant monkeys raised without mothers developed social deficits, showing reclusive tendencies and clinging to their cloth diapers. ... Harlow's work showed that infants also turned to inanimate surrogate mothers for comfort when they were faced with new and scary situations.
