ON THE NATURE OF PAIN

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Abstract
Wolff and Hardy contrast the older view that pain is a feeling, rather than a sensation like touch, heat, or cold, with the newer view that feeling and sensation are both fundamental phases of the pain experience. They take up the neural structures involved in the conduction of noxious impulses giving rise to pain; the qualities of pain and their significance; pain threshold (methods of investigating, uniformity, factors influencing, and effects of analgesics upon); discrimination of pain intensity; spatial summation for cutaneous pain; the 2 types of cutaneous pain; an infer-ence concerning the hyperalgesia of peripheral neuropathy; headache, as due to distention or pulling of intracranial blood vessels; true visceral pain; an analysis of deep pain into 3 categories (true visceral and deep somatic pain, referred pain, pains due to secondary skeletal muscular contractions which provide a fresh source of noxious impulses); and "central pain.".
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