Encyclopedia of Pain

2007 Edition

Allodynia and Alloknesis

  • Robert H. LaMotte
Reference work entry
DOI: https://doi.org/10.1007/978-3-540-29805-2_154

Synonyms

Alloknesis and Allodynia

Definition

Allodynia and alloknesis are abnormal sensory states wherein normally innocuous stimuli elicit unpleasant sensations or aversive responses.

 Allodynia is the  nociceptive sensation or aversive response evoked by a stimulus that is normally non-nociceptive (“allo” – “other”; “dynia” - pain). For example, a light stroking of the skin produced by the lateral motion of clothing, or the heat produced by the body are stimuli that do not elicit nociceptive sensations or responses under normal circumstances. However, these stimuli may become nociceptive after a cutaneous injury produced, for example, by sunburn. In contrast,  hyperalgesia is defined as the abnormal nociceptive state in which a normally painful stimulus such as the prick of a needle elicits a greater than normal duration and/or magnitude of pain.

 Alloknesis is the itch or  pruriceptive sensation (from the Latin word prurire, to itch) or scratching behavior evoked by a stimulus that...

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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Robert H. LaMotte
    • 1
  1. 1.Department of AnesthesiologyYale School of MedicineNew HavenUSA