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Nociceptive threshold testing deliberately applies a noxious stimulus to a human or animal subject to study pain. In animals, the technique is often used to study the efficacy of analgesic drugs and to establish dosing levels and period of effect.
' pain receptor ') is a sensory neuron that responds to damaging or potentially damaging stimuli by sending "possible threat" signals [1] [2] [3] to the spinal cord and the brain. The brain creates the sensation of pain to direct attention to the body part, so the threat can be mitigated; this process is called nociception.
The concept of nociception does not necessarily imply any adverse, subjective feeling; it is a reflex action. The second component is the experience of "pain" itself, or suffering—i.e., the internal, emotional interpretation of the nociceptive experience. Pain is therefore a private, emotional experience.
Noxious stimulation induces peripheral afferents responsible for transducing pain (including A-delta and C-nerve fibers, as well as free nerve endings) throughout the nervous system of an organism. The ability to perceive noxious stimuli is a prerequisite for nociception, which itself is a prerequisite for nociceptive pain. [1]
Nociplastic pain, also known as central sensitisation, is a third category of pain that is mechanistically distinct from nociceptive pain, which is due to inflammation and tissue damage, and neuropathic pain, which is due to nerve damage. [5] It may occur in combination with the other types of pain or in isolation.
A nociception assay (nocioception or nocioperception assay) evaluates the ability of an animal, usually a rodent, to detect a noxious stimulus such as the feeling of pain, caused by stimulation of nociceptors. These assays measure the existence of pain through behaviors such as withdrawal, licking, immobility, and vocalization.
Nociceptive pain serves as a warning or signal for tissue damage and works to preserve the body’s equilibrium and functionality. This pain is signaled by the interworkings of both the peripheral and central nervous systems . [ 11 ]
Noxious stimuli activate the endings of nociceptive C and A delta nerve fibers, which carry the signal to neurons in the dorsal horn of spinal cord. DNIC refers to the mechanism by which dorsal horn wide dynamic range neurons responsive to stimulation from one location of the body may be inhibited by noxious stimuli (such as heat, high pressure or electric stimulation) applied to another ...