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Related Concept Videos

Dementia01:30

Dementia

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Dementia is a collective term for cognitive disorders primarily affecting memory, thinking, and reasoning. It is not a specific disease but a syndrome, with Alzheimer's disease being the most common cause, accounting for approximately 60-80% of cases. Other types include vascular dementia, Lewy body dementia, and frontotemporal dementia. Dementia affects millions worldwide, particularly older adults, though it is not a normal part of aging.
The progression of dementia is generally gradual....
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Stimulants01:29

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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

Action Potential: Phases of Stimulation

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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.
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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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Updated: Feb 7, 2026

Deep Brain Stimulation with Simultaneous fMRI in Rodents
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Deep brain stimulation for dementias.

David S Xu, Francisco A Ponce

    Neurosurgical Focus
    |August 2, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Deep brain stimulation (DBS) shows surgical safety for Alzheimer's disease (AD) and Parkinson's disease dementia (PDD). However, current studies lack evidence of significant cognitive benefits, indicating early-phase research for these complex conditions.

    Keywords:
    AD = Alzheimer’s diseaseADAS-Cog 13 = Alzheimer’s Disease Assessment Scale–Cognitive subscale 13AVLT = Auditory Verbal Learning TestAlzheimer’s diseaseCDR-SB = Clinical Dementia Rating Sum of BoxesCh4i = intermediate portion of the NBMDBS = deep brain stimulationMCI = mild cognitive impairmentNBM = nucleus basalis of MeynertNINDS-ADRDA = National Institute of Neurological Disorders and Stroke–Alzheimer’s Disease and Related Disorders AssociationPD = Parkinson’s diseasePDD = Parkinson’s disease dementiaPET = positron emission tomographyParkinson’s diseasecognitive declinedeep brain stimulationdementiafunctional neurosurgery

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    Area of Science:

    • Neuroscience
    • Neurosurgery
    • Geriatric Medicine

    Background:

    • Alzheimer's disease (AD) and Parkinson's disease dementia (PDD) are complex neurodegenerative conditions.
    • Deep brain stimulation (DBS) is an investigational therapy for these conditions.

    Purpose of the Study:

    • To review the current experience with DBS for AD and PDD.
    • To evaluate patient selection, biological rationale, targeting, results, and adverse events.

    Main Methods:

    • Systematic review of published clinical studies on DBS for AD and PDD.
    • Analysis of 7 studies involving 57 AD patients and 7 PDD patients.

    Main Results:

    • Serious adverse events occurred in 9% of patients, with no deaths or permanent disabilities.
    • Most studies were early-phase (Phase 1/2) and not designed for efficacy assessment.
    • No significant or consistent cognitive benefits were identified across larger patient populations.

    Conclusions:

    • DBS for AD and PDD is in the early stages of investigation.
    • Current studies demonstrate acceptable surgical safety.
    • Future research requires refined patient selection, outcome metrics, and stimulation parameters for robust efficacy assessment.