Nociception
Negative and Cognitive Symptoms of Schizophrenia
Analgesia and Pain Management
Pain
Primary Motives: Sleep, Sex, and Pain Avoidance
Aggression
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Updated: Apr 5, 2026

Use of the Operant Orofacial Pain Assessment Device OPAD to Measure Changes in Nociceptive Behavior
Published on: June 10, 2013
Marwan N Baliki1, A Vania Apkarian2
1Department of Physiology, Feinberg School of Medicine, 303 East Chicago Avenue, Chicago, IL 60610, USA.
The brain adapts to pain, influencing chronic pain development. This study redefines nociception, acute pain, and chronic pain phases, linking them to behavioral learning and survival mechanisms.
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