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Altered States of Awareness01:06

Altered States of Awareness

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Altered states of consciousness represent significant deviations from one's normal mental state. These deviations can range from subtle changes in awareness to profound transformations in perception, thought processes, and sensory experiences. Altered states of consciousness can be triggered by various factors, including drug use, meditation, hypnosis, illness, or even intense fatigue.
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The concept of subconscious awareness refers to the processing of information below the level of conscious thought, which significantly influences both behaviors and decisions. It is also known as waking subconscious awareness. This complex level of cognition operates without the direct awareness of the individual, facilitating rapid and simultaneous handling of multiple information streams.
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Controlled processes in human consciousness represent high-alert mental states where individuals deliberately focus their attention on achieving specific goals. Controlled processes can be seen in situations like mastering new technology, where a person might become so absorbed that they ignore surrounding distractions. Such processes involve selective attention, requiring one to concentrate on particular elements of experience while disregarding others. These are governed by executive...
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Various sedation levels offer significant advantages in facilitating procedural interventions for patients undergoing medical or invasive surgical procedures. These levels span from anxiolysis to general anesthesia, providing a spectrum of sedative effects to cater to specific patient needs. Anxiolysis reduces anxiety and is achieved through minimal sedation, enabling patients to remain awake and responsive while feeling more at ease during the procedure. This level can benefit minor...
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Related Experiment Video

Updated: Nov 12, 2025

Method for Simultaneous fMRI/EEG Data Collection during a Focused Attention Suggestion for Differential Thermal Sensation
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Segregated brain state during hypnosis.

Jarno Tuominen1,2, Sakari Kallio1,3, Valtteri Kaasinen2,4,5

  • 1Department of Psychology and Speech-Language Pathology, Assistentinkatu 7, 20014 University of Turku, Turku, Finland.

Neuroscience of Consciousness
|March 22, 2021
PubMed
Summary
This summary is machine-generated.

A single word can alter brain states. Hypnotic induction shifted neural connectivity, suggesting a brain state change that may influence hypnotic responsiveness.

Keywords:
brain dynamicshypnosismetastabilitytranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychology

Background:

  • Demonstrating altered global brain states is challenging due to natural variations in brain activity.
  • Brain activity can be voluntarily influenced, complicating the study of distinct brain states.
  • Highly hypnotizable individuals may offer insights into state-dependent brain function.

Purpose of the Study:

  • To investigate if a simple social cue can induce an altered global brain state.
  • To measure changes in brain activity and connectivity in response to hypnotic induction.
  • To explore the neural underpinnings of hypnotic responsiveness.

Main Methods:

  • Electrophysiological responses to transcranial magnetic stimulation (TMS) were measured in a highly hypnotizable subject (a 'hypnotic virtuoso').
  • The complexity of the brain's response to TMS was analyzed as a measure of global brain state.
  • A single-word hypnotic induction was used as the social cue.

Main Results:

  • A single-word hypnotic induction significantly altered global neural connectivity.
  • The induced state featured sustained activity but reduced coherent activation in frontoparietal cortices.
  • Measures of perturbational complexity indicated a shift towards a more segregated brain state.

Conclusions:

  • A simple social cue, like a hypnotic induction, can robustly shift the brain into a different global state.
  • This state shift is characterized by altered neural connectivity and reduced frontoparietal coherence.
  • The findings suggest that hypnotic responsiveness may be moderated by these induced changes in brain state.