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Related Concept Videos

Dementia l: Introduction01:22

Dementia l: Introduction

Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
Dementia01:30

Dementia

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.
Alzheimer Disease l: Introduction01:29

Alzheimer Disease l: Introduction

Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
Alzheimer Disease ll: Pathophysiology01:23

Alzheimer Disease ll: Pathophysiology

Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and microglia. Abnormal...
Association Areas of the Cortex01:21

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Alzheimer's Disease: Overview01:26

Alzheimer's Disease: Overview

Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ and tau...

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Related Experiment Video

Updated: Jul 6, 2026

Abbiategrasso Brain Bank Protocol for Collecting, Processing and Characterizing Aging Brains
12:28

Abbiategrasso Brain Bank Protocol for Collecting, Processing and Characterizing Aging Brains

Published on: June 3, 2020

Frontal-subcortical dementias.

Raphael M Bonelli1, Jeffrey L Cummings

  • 1Department of Psychiatry, Graz Medical University, Graz, Austria.

The Neurologist
|March 12, 2008
PubMed
Summary
This summary is machine-generated.

Frontal-subcortical dementias involve subcortical pathology and frontal dysfunction, presenting with memory loss, personality changes, and slowed thinking. These conditions may exist on a continuum with cortical dementias.

Related Experiment Videos

Last Updated: Jul 6, 2026

Abbiategrasso Brain Bank Protocol for Collecting, Processing and Characterizing Aging Brains
12:28

Abbiategrasso Brain Bank Protocol for Collecting, Processing and Characterizing Aging Brains

Published on: June 3, 2020

Area of Science:

  • Neuroscience
  • Neurology
  • Gerontology

Background:

  • Frontal-subcortical dementias (FSD) are a diverse group of disorders.
  • They are characterized by primary subcortical pathology and distinct neuropsychological deficits.

Purpose of the Study:

  • To define the characteristics and scope of frontal-subcortical dementias.
  • To explore the relationship between frontal-subcortical and cortical dementias.

Main Methods:

  • Review of existing literature and clinical data on various dementia types.
  • Analysis of anatomical and pathological findings in frontal-subcortical dementias.

Main Results:

  • FSD present with memory impairment, executive dysfunction, personality changes (apathy, depression), and bradyphrenia.
  • Conditions like Huntington's, Parkinson's disease dementia, and progressive supranuclear palsy are classic examples.
  • A continuum exists between FSD and cortical dementias, with significant overlap in pathology.

Conclusions:

  • The distinction between frontal-subcortical and cortical dementia may not be absolute.
  • These concepts remain useful for understanding dementia heterogeneity and disease progression.
  • Subcortical disorders share similarities that may distinguish them from Alzheimer's Disease.