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Related Concept Videos

Subconsciousness and No Awareness01:15

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...
Understanding Consciousness01:23

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...
Sleep-Wake Cycles01:24

Sleep-Wake Cycles

Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
High-Level and Low-Level Awareness01:19

High-Level and Low-Level Awareness

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...
Narcolepsy01:07

Narcolepsy

Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
Sleepwalking and Sleep Talking01:17

Sleepwalking and Sleep Talking

Somnambulism, commonly known as sleepwalking, involves individuals engaging in activities ranging from simple walking to more complex behaviors such as driving. Sleepwalking typically occurs during the slow-wave sleep stages 3 and 4 early in the night when the person is not dreaming, contradicting the myth that sleepwalkers are acting out their dreams.
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SECONDs Administration Guidelines: A Fast Tool to Assess Consciousness in Brain-injured Patients
11:05

SECONDs Administration Guidelines: A Fast Tool to Assess Consciousness in Brain-injured Patients

Published on: February 6, 2021

Unresponsiveness ≠ unconsciousness.

Robert D Sanders1, Giulio Tononi, Steven Laureys

  • 1Department of Anaesthetics, Intensive Care & Pain Medicine, Imperial College London, London, United Kingdom. robert.sanders@imperial.ac.uk

Anesthesiology
|February 9, 2012
PubMed
Summary
This summary is machine-generated.

Consciousness can persist during anesthesia, even without responsiveness. Anesthesia may disconnect subjective experience from the environment, a phenomenon observed in 37% of patients, highlighting the need for targeted monitoring.

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Area of Science:

  • Neuroscience
  • Anesthesiology

Background:

  • Consciousness is subjective experience, often persisting during sleep (dreaming) and anesthesia.
  • A key goal of anesthesia is to prevent awareness of surgery by inducing unconsciousness or disconnection.
  • The isolated forearm technique reveals that consciousness, connectedness, and responsiveness can uncouple during anesthesia.

Purpose of the Study:

  • To review the phenomenon of disconnected consciousness during anesthesia.
  • To explore neurobiological mechanisms underlying consciousness, connectedness, and responsiveness during anesthesia.
  • To emphasize the need for improved anesthetic monitoring.

Main Methods:

  • Review of the isolated forearm technique in anesthesia.
  • Analysis of neurobiological constructs related to consciousness and anesthesia.
  • Discussion of clinical implications for anesthetic monitoring.

Main Results:

  • A median of 37% of patients under anesthesia demonstrate connected consciousness, indicating a dissociation between consciousness and responsiveness.
  • Light anesthesia may disable behavioral responsiveness mechanisms while preserving corticothalamic information integration (consciousness) and norepinephrinergic signaling (connectedness).

Conclusions:

  • Consciousness, connectedness, and responsiveness are distinct and can uncouple during anesthesia.
  • Current anesthetic monitoring may not adequately assess these dissociations.
  • Developing monitors targeting specific mechanisms of consciousness and connectedness is crucial for patient safety.