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Related Experiment Video

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Informational complexity as a neural marker of cognitive reserve.

Laura Stolp1, Kanad N Mandke2, Pedro Am Mediano3

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|January 6, 2026
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Summary

Cognitive reserve in Alzheimer's disease (AD) was measured by how well participants maintained attention while drowsy. Higher cognitive reserve was linked to increased informational complexity (LZsum) under drowsiness, suggesting a potential neural marker.

Keywords:
Alzheimer’s DiseaseCognitive reserveEEG ExperimentInformational complexityNeural Marker

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Biomedical Engineering

Background:

  • Alzheimer's disease (AD) is characterized by a discrepancy between brain damage and cognitive function, often explained by cognitive reserve.
  • Understanding the neural basis of cognitive reserve is crucial for evaluating AD interventions.
  • Individual differences in cognitive reserve necessitate personalized therapeutic approaches.

Purpose of the Study:

  • To investigate the neural mechanisms underlying cognitive reserve.
  • To define cognitive reserve operationally as the ability to sustain task performance under drowsiness.
  • To explore informational complexity (LZsum) as a potential neural marker of cognitive reserve.

Main Methods:

  • High-density EEG was used to record brain activity in 38 elderly participants performing a sustained attention task.
  • Participants completed the task in both alert and drowsy states.
  • The Lempel-Ziv (LZsum) algorithm was employed to measure informational complexity.
  • Structural MRI and network analyses were conducted.

Main Results:

  • A significant interaction was observed between arousal state and performance.
  • LZsum values increased in high performers when drowsy but decreased in low performers, particularly in frontal and central brain areas.
  • These LZsum changes suggest a compensatory mechanism related to cognitive reserve.
  • Performance was associated with specific brain regions (entorhinal cortex, supramarginal gyrus) and frontoparietal networks.

Conclusions:

  • The study proposes LZsum as a potential neural marker for cognitive reserve.
  • Findings highlight the dynamic neural processes involved in maintaining cognitive function under strain.
  • Broader neural correlates of compensatory capacity in Alzheimer's disease were identified.