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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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Theory of Attribution I: Correspondent Inference Theory01:15

Theory of Attribution I: Correspondent Inference Theory

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Correspondent inference theory, proposed by Jones and Davis in 1965, seeks to explain how individuals infer stable personality traits from observed behaviors. It suggests that people attribute actions to underlying dispositions rather than external circumstances, particularly when the behavior appears intentional and socially significant.Voluntary Behavior and Dispositional AttributionAccording to this theory, individuals are more likely to attribute behavior to personal traits when it appears...
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Deformation in a Circular Shaft01:10

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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

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Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
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Uniform Circular Motion01:14

Uniform Circular Motion

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Uniform circular motion is a specific type of motion in which an object travels in a circle with a constant speed. For example, any point on a propeller spinning at a constant rate is undergoing uniform circular motion. The second, minute, and hour hands of a watch also undergo uniform circular motion. It is hard to believe that points on these rotating objects are actually accelerating, even though the rotation rate is constant. To understand this, we must analyze the motion in terms of...
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Non-uniform Circular Motion01:22

Non-uniform Circular Motion

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In uniform circular motion, the particle executing circular motion has a constant speed, and the circle is at a fixed radius. However, not all circular motion occurs at a constant speed. A particle can travel in a circle and speed up or slow down, showing an acceleration in the direction of motion. In that case, the motion is called non-uniform circular motion, and an additional acceleration is introduced, which is in the direction tangential to the circle. 
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Related Experiment Video

Updated: Feb 13, 2026

Using Retinal Imaging to Study Dementia
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Circular Inference in Dementia Diagnostics.

Poul F Høilund-Carlsen1,2, Jorge R Barrio3, Albert Gjedde1,2,4

  • 1Department of Nuclear Medicine, Odense University Hospital, Odense, Denmark.

Journal of Alzheimer'S Disease : JAD
|March 6, 2018
PubMed
Summary
This summary is machine-generated.

Amyloid imaging for Alzheimer's disease (AD) diagnosis is misleading, argue the authors. Despite claims of additive value, this method lacks correlation with autopsy findings and should not be used for AD diagnosis.

Keywords:
Alzheimer’s diseaseamyloid PETcircular inferencedementia

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Area of Science:

  • Neurology
  • Medical Imaging
  • Geriatrics

Background:

  • Recent international articles suggest amyloid imaging provides significant value in diagnosing Alzheimer's disease (AD) when initial investigations are inconclusive.
  • This perspective highlights a growing reliance on in-vivo detection methods for neurodegenerative disease diagnosis.

Discussion:

  • This editorial critiques the current literature, asserting that the purported additive value of amyloid imaging is based on circular reasoning.
  • The authors contend that the diagnostic utility of amyloid PET scans is overestimated and potentially misleading.

Key Insights:

  • Amyloid Positron Emission Tomography (PET) findings frequently do not align with autopsy results, questioning its diagnostic accuracy.
  • A significant disconnect exists between amyloid detection and definitive pathological markers of Alzheimer's disease.

Outlook:

  • The authors conclude that amyloid imaging currently has no established role in the clinical diagnosis of Alzheimer's disease.
  • Future research should focus on validating imaging biomarkers against definitive pathological outcomes to avoid diagnostic ambiguity.