Do you define the limits of normalcy from looking at the patient or the healthy subject?

In the practice of clinical neurophysiology, you are asked to differentiate between a normal and an abnormal function of the nervous system. The clinical question is often whether specific symptoms can be attributed to a disease process in the nervous system. This dichotomy between normal and abnormal is often posed by the patient, too. The wish is granted either to reassure him, that nothing is wrong, or to give him/her the reassurance of knowledge about a diagnosis and a prognosis.

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