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Understanding Consciousness

Understanding Consciousness

Consciousness can be defined as the state of being aware of and able to think about one's existence, sensations, and surroundings. It encompasses two major components: awareness and arousal. Awareness pertains to the recognition of environmental stimuli and internal states. At the same time, arousal refers to the physiological readiness to engage with these stimuli, which varies significantly between states like sleep and wakefulness.
Sleep, a crucial state, is characterized by reduced physical...

Altered States of Awareness

Altered States of Awareness

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.
The ingestion of substances like stimulants or hallucinogens leads to chemical alterations in the brain that...

Subconsciousness and No Awareness

Subconsciousness and No Awareness

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.
An illustrative example of subconscious processing is its role in problem-solving. Often, individuals...

High-Level and Low-Level Awareness

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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...

Extrasensory Perception

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Precognition involves foreseeing future events, such as predicting an accident before it happens. An example of precognition could be someone dreaming about a specific event, like a car crash, which then occurs...

Self-Awareness and Its Effects

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Related Experiment Video

Updated: May 30, 2026

Assessment and Communication for People with Disorders of Consciousness

Assessment and Communication for People with Disorders of Consciousness

Published on: August 1, 2017

[Can consciousness be measured?].

Antti Revonsuo¹, Valtteri Arstila

¹Turun Yliopisto, käyttäytymistieteiden ja Filosofian Laitos.

Duodecim; Laaketieteellinen Aikakauskirja

|August 3, 2011

Summary

This summary is machine-generated.

New brain imaging techniques reveal consciousness in unresponsive patients. Researchers can now objectively measure consciousness and even decode visual sensations directly from brain activity.

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Area of Science:

Neuroscience
Cognitive Science
Medical Imaging

Context:

Advancements in neuroimaging and measurement techniques.
Objective assessment of consciousness phenomena.
Surprising findings in patients previously deemed unconscious.

Purpose:

To explore the objective measurement of consciousness.
To investigate the localization and timing of conscious visual sensations.
To assess the potential of brain imaging for reading consciousness content.

Summary:

Objective measurement of consciousness is now possible using advanced imaging.
Patients may exhibit consciousness even when appearing unresponsive.
Brain imaging can elucidate the generation of conscious visual perception.

Impact:

Challenges traditional criteria for assessing consciousness.
Opens new avenues for diagnosing and understanding disorders of consciousness.
Potential for direct 'reading' of conscious content from brain activity.