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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
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Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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Biomarkers.

Jessica Robin1, Rosanne L van den Berg2, Mengdan Xu1

  • 1Cambridge Cognition, Cambridge, United Kingdom.

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

Speech patterns are reliable with frequent picture description tasks. Averaging results from multiple pictures enhances reliability for longitudinal cognitive assessments.

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Area of Science:

  • Cognitive Science
  • Neurolinguistics
  • Speech Pathology

Background:

  • Speech characteristics differ in mild cognitive impairment (MCI) and Alzheimer's disease (AD).
  • The picture description task elicits naturalistic speech for measuring these changes.
  • Its suitability for remote, frequent data collection is promising, but reliability over repeated testing is unknown.

Purpose of the Study:

  • To assess the reliability of speech measures from the picture description task over repeated, high-frequency testing in cognitively unimpaired adults.
  • To determine if speech characteristics vary significantly across repeated administrations of the task.

Main Methods:

  • 50 cognitively unimpaired adults underwent a 5-day testing session with two picture description tasks daily.
  • Tested conditions included repeated (same picture) and alternating (unique picture) stimuli.
  • Speech measures were analyzed for differences between sessions using paired differences and intra-class correlations (ICCs).

Main Results:

  • Most speech measures showed no significant difference between subsequent test days.
  • A trend towards producing more words was observed across testing days.
  • Test-retest reliability (ICC) ranged from 0.22-0.92, with 7/10 measures exceeding 0.5 in both conditions.
  • Averaging speech measures across both picture conditions yielded the highest reliability.

Conclusions:

  • The picture description task demonstrates stable and reliable speech measures for high-frequency administration.
  • Repeated testing may introduce learning or familiarity effects, leading to longer descriptions.
  • Averaging across multiple picture administrations optimizes reliability for longitudinal studies.
  • This task is ecologically valid, low-burden, and suitable for remote, frequent cognitive monitoring.