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Clinical Manifestations.

Kathleen Hall1, Michael Blank1, Kristin Geraci1

  • 1Neurobehavioral Systems, Inc, Berkeley, CA, USA.

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

The California Cognitive Assessment Battery (CCAB) offers automated logical memory tasks for assessing episodic memory and speech biomarkers in older adults. This technology provides reliable, objective insights for detecting cognitive decline.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Biomarkers

Background:

  • Logical memory tasks are crucial for evaluating episodic memory and language in older adults, aiding in the detection of mild cognitive impairment (MCI) and Alzheimer's disease (AD).
  • The California Cognitive Assessment Battery (CCAB) introduces an automated logical memory (LM) encoding and recall task.
  • This automated system facilitates the extraction of speech and language biomarkers (SLBs).

Purpose of the Study:

  • To describe the automated logical memory (LM) task within the California Cognitive Assessment Battery (CCAB).
  • To evaluate the reliability and validity of automated scoring and SLB extraction for memory assessment.
  • To assess the utility of the CCAB LM task in characterizing episodic verbal memory and communication abilities in older adults.

Main Methods:

  • 772 participants (66.5 ± 8.5 years) completed the CCAB LM task remotely over two days.
  • Automated administration via text-to-speech, with responses transcribed by consensus automatic speech recognition (CASR).
  • High-quality audio recordings captured acoustic/phonetic measures; CASR transcripts yielded linguistic SLBs. Immediate and delayed recall were assessed.

Main Results:

  • The LM task demonstrated excellent test-retest reliability for total match count (r = .77–.79).
  • Recall performance was significantly influenced by vocabulary, age, gender, education, and race.
  • Speech rate and pause ratio showed good reliability (r = .61–.58) and correlated significantly with delayed recall.

Conclusions:

  • The CCAB's automated logical memory tasks offer objective analysis of recall and SLBs for assessing episodic verbal memory in older adults.
  • This automated approach provides a reliable and efficient method for cognitive assessment.
  • The CCAB LM task is a valuable tool for evaluating memory and communication abilities, potentially aiding in early detection of cognitive impairment.