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  1. Antti Revonsuo, Sakari Kallio & Pilleriin Sikka (2009). What is an Altered State of Consciousness? Philosophical Psychology 22 (2):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 alteration that (...)
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  2. Alexander A. Fingelkurts, Andrew A. Fingelkurts, Sakari Kallio & Antti Revonsuo (2007). HYPNOSIS INDUCES A CHANGED COMPOSITION OF BRAIN OSCILLATIONS IN EEG: A CASE STUDY. Contemporary Hypnosis 24 (1):3-18.
    Cognitive functions associated with the frontal lobes of the brain may be specifi cally involved in hypnosis. Thus, the frontal area of the brain has recently been of great interest when searching for neural changes associated with hypnosis. We tested the hypothesis that EEG during pure hypnosis would differ from the normal non-hypnotic EEG especially above the frontal area of the brain. The composition of brain oscillations was examined in a broad frequency band (130 Hz) in the electroencephalogram (EEG) of (...)
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  3. Andrew A. Fingelkurts, Alexander A. Fingelkurts, Sakari Kallio & Antti Revonsuo (2007). Cortex Functional Connectivity as a Neurophysiological Correlate of Hypnosis: An EEG Case Study. Neuropsychologia 45 (7):14521462.
    Cortex functional connectivity associated with hypnosis was investigated in a single highly hypnotizable subject in a normal baseline condition and under neutral hypnosis during two sessions separated by a year. After the hypnotic induction, but without further suggestions as compared to the baseline condition, all studied parameters of local and remote functional connectivity were significantly changed. The significant differences between hypnosis and the baseline condition were observable (to different extent) in five studied independent frequency bands (delta, theta, alpha, beta, and (...)
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  4. Sakari Kallio & Antti Revonsuo (2003). Hypnotic Phenomena and Altered States of Consciousness: A Multilevel Framework of Description and Explanation. Contemporary Hypnosis 20 (3):111-164.