To quote Goodman & Gilman :
An alternative way of defining the anesthetic state is to consider it as a collection of “component” changes in behavior or perception. The components of the anesthetic state include:
• immobility in response to noxious stimulation
• attenuation of autonomic responses to noxious stimulation
My question is, does not the state of Unconsciousness already imply other components of analgesia and amnesia? Analgesia is the absence of the perception of pain, which is granted if there is unconsciousness which would be the absence of all perceptions.
I am not certain if unconsciousness also entails amnesia, but it seems that remembering what happened when unconscious seems considerably unlikely.
Apart from a reductionist argument for minimizing the constraints required for classification as a general anesthetic, I am more interested in cases where unconsciousness would be achieved without analgesia or amnesia, which could be a likely rationale behind including the additional caveats in the definition.