Without the requisite stimulation during the critical period allotted by Nature for the visual system’s development, the child’s brain would never have received the information that being able to see is needed for survival. Irreversible blindness would be the result. What is true for vision is also true for the dopamine circuits of incentive-motivation and the opioid circuitry of attachment-reward, as well as for the regulatory centres in the prefrontal cortex, such as the orbitofrontal cortex—in
