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Clinical Manifestations.

Aparna Lalana Venugopal1, Vandana V P2, Subasree Ramakrishnan3

  • 1National Institute of Mental Health and Neurosciences, Bengaluru, Karnataka, India.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 25, 2025
PubMed
Summary
This summary is machine-generated.

Individuals with dementia show reduced efficiency and quantity in conveying information, as measured by Correct Information Units (CIUs). This semantic measure effectively distinguishes dementia from healthy controls.

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Area of Science:

  • Neuroscience
  • Linguistics
  • Psychology

Background:

  • Semantic impairment is an early indicator of dementia, preceding other linguistic changes.
  • Correct Information Units (CIUs) are established measures for analyzing semantic content in discourse.
  • Dementia diagnosis and subtype classification were confirmed using established neurological and cognitive criteria.

Purpose of the Study:

  • To identify dementia using language samples from a picture description task.
  • To evaluate the effectiveness of CIUs and related measures in differentiating dementia patients from controls.
  • To explore the correlation between CIU measures and other cognitive and language assessments.

Main Methods:

  • Mild dementia (n=27) and control (n=30) groups were compared.
  • Language samples were elicited using a novel picture description task.
  • Semantic measures (CIUs, CIU%, efficiency) and diversity measures (TTR) were analyzed using established software.

Main Results:

  • Dementia patients exhibited significantly lower CIU efficiency and overall CIU performance compared to controls.
  • Individuals with dementia showed poorer performance on CIU-related measures and Type Token Ratio (TTR).
  • CIU measures strongly correlated with overall cognition, naming abilities, and semantic fluency.

Conclusions:

  • CIUs and efficiency metrics derived from a simple picture description task can effectively discriminate dementia from controls.
  • Reduced information-carrying efficiency and quantity in CIUs are key indicators of dementia.
  • This method offers a valuable tool for early dementia detection through language analysis.