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Related Concept Videos

Optimal Arousal Theory01:23

Optimal Arousal Theory

The optimal arousal theory suggests that performance is maximized when an individual experiences a moderate level of arousal. This theory is closely tied to the Yerkes-Dodson law, which illustrates an inverted U-shaped relationship between arousal and performance. The law, formulated by psychologists Robert Yerkes and John Dodson, implies an ideal arousal level for optimal performance, and deviations from this level can lead to declines in effectiveness.
Inverted U-Shaped Performance Curve
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Psychosexual Stages of Personality: Latency01:16

Psychosexual Stages of Personality: Latency

Following the phallic stage in Freud's theory of psychosexual development, children enter a phase called the latency period, which lasts from approximately six to twelve years of age. Unlike earlier stages, where sexual impulses played a central role, Freud believed these impulses are repressed during the latency period, becoming part of the unconscious. This stage is often described as a time of psychological calm after the turbulence of the phallic stage.
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REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
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Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...
Male Sexual Response: Erection & Ejaculation01:17

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Sexual stimulation can take various forms, such as physical touch and visual or auditory cues. When this happens, the parasympathetic reflex in the sacral portion of the spinal cord is activated. This reflex stimulates the release of nitric oxide (NO), which then dilates the arterioles in the penis, increasing blood flow to the erectile tissues - the corpora cavernosa and corpus spongiosum.
The blood filling the erectile tissues compresses the veins, which helps to prevent blood from leaving...
Sympathetic Activation01:16

Sympathetic Activation

The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...

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Related Experiment Video

Updated: Jun 19, 2026

Eye Tracking, Cortisol, and a Sleep vs. Wake Consolidation Delay: Combining Methods to Uncover an Interactive Effect of Sleep and Cortisol on Memory
08:08

Eye Tracking, Cortisol, and a Sleep vs. Wake Consolidation Delay: Combining Methods to Uncover an Interactive Effect of Sleep and Cortisol on Memory

Published on: June 18, 2014

Delayed arousal.

Zirka H Anastasian1, Eugene Ornstein, Eric J Heyer

  • 1Division of Neurosurgical Anesthesiology, Department of Anesthesiology, Columbia University, New York, NY 10032, USA. zh2114@columbia.edu

Anesthesiology Clinics
|October 15, 2009
PubMed
Summary
This summary is machine-generated.

Delayed arousal in elderly patients can stem from various medical issues, altered medication effects, or neurological problems. A structured approach using clinical, chemical, and imaging tests helps identify the cause.

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Area of Science:

  • Geriatric Medicine
  • Neurology
  • Clinical Pharmacology

Background:

  • Elderly patients present complex medical and psychological issues impacting organ systems.
  • These conditions can modify drug effects (pharmacokinetics/pharmacodynamics) and reveal pre-existing neurological deficits, especially with sedation.
  • Delayed arousal in this population necessitates a thorough diagnostic evaluation.

Observation:

  • Delayed arousal can result from structural brain issues (pre-existing or new), metabolic disorders, or seizures (convulsive/nonconvulsive).
  • Impaired consciousness may stem from focal lesions in the central nervous system or broader cerebral pathology.
  • Diagnostic tools include clinical assessment, chemical tests, and advanced imaging like computerized tomography (CT) and diffusion-weighted imaging (DWI).

Findings:

  • Focal or multifocal brain lesions causing consciousness impairment are detectable via CT and DWI.
  • A systematic workup is crucial for diagnosing the diverse causes of delayed arousal in older adults.
  • The study proposes an algorithm to guide the diagnostic process.

Implications:

  • Accurate diagnosis of delayed arousal is vital for appropriate management in elderly patients.
  • Understanding the interplay of medical conditions, medications, and neurological status is key.
  • Implementing the proposed algorithm can improve diagnostic efficiency and patient outcomes.