What is an altered state of consciousness?

@article{Revonsuo2009WhatIA,
  title={What is an altered state of consciousness?},
  author={Antti Revonsuo and Sakari Kallio and Pilleriin Sikka},
  journal={Philosophical Psychology},
  year={2009},
  volume={22},
  pages={187 - 204}
}
“Altered State of Consciousness” (ASC) has been defined as a changed overall pattern of conscious experience, or as the subjective feeling and explicit recognition that one's own subjective experience has changed. We argue that these traditional definitions fail to draw a clear line between altered and normal states of consciousness (NSC). We outline a new definition of ASC and argue that the proper way to understand the concept of ASC is to regard it as a representational notion: the… 

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