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Related Concept Videos

Stimulants01:29

Stimulants

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Stimulants are substances that enhance neural activity and elevate dopamine levels in the brain, leading to their highly addictive nature. These drugs include cocaine, amphetamines, MDMA, caffeine, and nicotine, each with distinct mechanisms of action and varied health implications.
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Motor Unit Stimulation01:20

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
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Action Potential: Phases of Stimulation01:28

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The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
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CNS Stimulants: Psychedelic Agents01:22

CNS Stimulants: Psychedelic Agents

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Hallucinogens, also known as psychedelic drugs, are a class of substances known for their ability to alter perception, cognition, and emotions. Despite their profound effects on the mind, these drugs are non-addictive, setting them apart from many other abused substances. The mechanism of action of these drugs lies in their impact on the 5-HT2A receptor in the brain. Upon activation, this receptor couples to Gq-type G proteins, triggering a cascade that releases intracellular calcium. This...
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CNS Stimulants: Cocaine, Amphetamines and Cannabinoids01:24

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CNS stimulants, such as cocaine, amphetamines, and cannabinoids, have varying structures and mechanisms of action that lead to different therapeutic effects and side effects. Cocaine, with its molecular formula C17H21NO4, is a tropane alkaloid and a tertiary amino compound. It has two chemical forms: the hydrochloride salt and the "freebase." The former is in powder form, while the latter involves removing the hydrochloride salt to create a form that can be smoked. Cocaine exerts its...
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Updated: Jan 30, 2026

Analysis of Gene Expression Changes in the Rat Hippocampus After Deep Brain Stimulation of the Anterior Thalamic Nucleus
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Deep brain stimulation for dystonia.

Filipe B Rodrigues1, Gonçalo S Duarte, David Prescott

  • 1Laboratório de Farmacologia Clínica e Terapêutica, Faculdade de Medicina de Lisboa, Avenida Professor Egas Moniz, Lisboa, Portugal, 1649-028.

The Cochrane Database of Systematic Reviews
|January 11, 2019
PubMed
Summary
This summary is machine-generated.

Deep brain stimulation (DBS) may reduce dystonia symptoms and improve function in adults, but evidence on its safety and tolerability is uncertain. Further research is needed to confirm long-term efficacy and safety for various dystonia types.

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Area of Science:

  • Neurology
  • Neurosurgery
  • Movement Disorders

Background:

  • Dystonia is a disabling disorder causing involuntary muscle posturing.
  • Deep brain stimulation (DBS) is reserved for severe, drug-refractory cases.
  • Uncertainty exists regarding DBS efficacy, safety, and tolerability in dystonia.

Purpose of the Study:

  • To compare deep brain stimulation (DBS) efficacy, safety, and tolerability against placebo, sham intervention, or best medical care.
  • To evaluate DBS in adults with various forms of dystonia, including botulinum toxin and surgical interventions.

Main Methods:

  • Systematic search of multiple databases, clinical trial registries, and grey literature.
  • Inclusion of double-blind, parallel, randomized controlled trials (RCTs) comparing DBS with control interventions.
  • Meta-analysis using random-effects models and GRADE methods for evidence quality assessment.

Main Results:

  • Low-quality evidence suggests DBS of the internal globus pallidus may improve symptoms, functional capacity, and mood in cervical dystonia.
  • Low-quality evidence indicates DBS may improve symptoms, clinical status, and quality of life in generalized or segmental dystonia.
  • Very low-quality evidence shows inconclusive results regarding the safety and tolerability of DBS for dystonia.

Conclusions:

  • Deep brain stimulation (DBS) may offer benefits for symptom severity and functional capacity in moderate to severe dystonia.
  • Evidence regarding DBS's impact on quality of life and its safety/tolerability remains uncertain, particularly for cervical dystonia.
  • Further research is essential to establish long-term efficacy and safety, especially for pediatric populations and alternative DBS protocols.