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Age-related impairments in scene-based mnemonic pattern separation.

Mingyue Zhang1, Qiuxuan Yu2, Tingting Wu2

  • 1Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, China.

Behavioural Brain Research
|February 14, 2026
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Summary

Older adults show reduced memory discrimination due to age-related brain changes affecting pattern separation. This impacts their ability to distinguish similar memories, highlighting cognitive decline in aging.

Keywords:
AgingEpisodic memoryPattern separationRecognition

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • Pattern separation is crucial for episodic memory and relies on the hippocampus.
  • Hippocampal integrity is susceptible to age-related atrophy.
  • Understanding age-related declines in pattern separation is vital for cognitive health research.

Purpose of the Study:

  • To investigate if pattern separation is significantly reduced in healthy older adults compared to younger adults.
  • To assess the impact of aging on the neural process of distinguishing similar experiences.
  • To evaluate memory discrimination and recognition across varying levels of perceptual degradation in different age groups.

Main Methods:

  • Recruited 20 healthy younger and 20 older adults.
  • Administered a scene-based pattern separation task with image classification (old, new, lure).
  • Varied image visual completeness to simulate degraded sensory input and analyzed behavioral data.

Main Results:

  • Older adults demonstrated significantly lower overall accuracy and slower response times than younger adults.
  • A substantially reduced lure discrimination index and lower corrected recognition scores were observed in older adults.
  • Age-related reductions in memory discrimination and recognition persisted across all levels of perceptual degradation.

Conclusions:

  • Findings confirm robust age-related reductions in memory discrimination and recognition.
  • These deficits are consistent with the vulnerability of hippocampal-dependent memory processes in aging.
  • The study provides a nuanced behavioral framework for assessing cognitive decline and memory deficits in older populations using a scene-based task with parametric image occlusion.