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Research Articles, Behavioral/Cognitive

Out of Rhythm: Compromised Precision of Theta-Gamma Coupling Impairs Associative Memory in Old Age

Anna E. Karlsson, Ulman Lindenberger and Myriam C. Sander
Journal of Neuroscience 2 March 2022, 42 (9) 1752-1764; DOI: https://doi.org/10.1523/JNEUROSCI.1678-21.2021
Anna E. Karlsson
1Center for Lifespan Psychology, Max Planck Institute for Human Development, 14195 Berlin, Germany
2Department of Psychology, Humboldt-Universität zu Berlin, 12489 Berlin, Germany
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Ulman Lindenberger
1Center for Lifespan Psychology, Max Planck Institute for Human Development, 14195 Berlin, Germany
3Max Planck UCL Centre for Computational Psychiatry and Ageing Research, 14195 Berlin, Germany, and London WC1B 5EH, England
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Myriam C. Sander
1Center for Lifespan Psychology, Max Planck Institute for Human Development, 14195 Berlin, Germany
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Abstract

Episodic memory declines with advancing adult age. This decline is particularly pronounced when associations between items and their contexts need to be formed. According to theories of neural communication, the precise coupling of gamma power to the phase of the theta rhythm supports associative memory formation. To investigate whether age differences in associative memory are related to compromised theta-gamma coupling, we took EEG recordings during the encoding phase of an item-context association task. Fifty-eight younger (33 females) and 55 older (24 females) adults studied pictures of objects superimposed on background scenes. In a recognition test, objects were presented on old or new backgrounds, and participants responded if they had seen (1) the object and (2) the object/scene pair. Theta-gamma coupling supported pair memory formation in both age groups. Whereas pair memory was associated with coupling closer to the peak of the theta rhythm, item-only memory was associated with a deviation in phase angle relative to pair memory. Furthermore, a stable relation between coupling phase and pair memory performance demonstrated that coupling closer to the peak is beneficial for associative memory. Critically, older adults' lower pair memory was accompanied by a shift in coupling phase relative to that of younger adults. In concert, the present results are consistent with the hypothesis that decrements in the temporal precision with which gamma power is coupled to a specific theta phase underlie the decline of associative memory in normal cognitive aging.

SIGNIFICANCE STATEMENT According to prominent theories of neural communication, the precise coordination of oscillatory activity enables the formation of associative memories. We propose that normal cognitive aging impairs associative memory formation by compromising the temporal precision of neural communication. We show that the coupling of high-frequency gamma power to low-frequency theta phase supports associative memory formation in both younger and older adults, with coupling closer to the theta peak benefitting memory performance. However, compared with younger adults, the coupling phase angle is shifted in time and is more variable in the older adults. We conclude that alterations in the precise timing of theta-gamma coupling contribute to adult age differences in associative memory.

  • aging
  • associative memory
  • cross-frequency coupling
  • EEG
  • oscillations

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The Journal of Neuroscience: 42 (9)
Journal of Neuroscience
Vol. 42, Issue 9
2 Mar 2022
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Out of Rhythm: Compromised Precision of Theta-Gamma Coupling Impairs Associative Memory in Old Age
Anna E. Karlsson, Ulman Lindenberger, Myriam C. Sander
Journal of Neuroscience 2 March 2022, 42 (9) 1752-1764; DOI: 10.1523/JNEUROSCI.1678-21.2021

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Out of Rhythm: Compromised Precision of Theta-Gamma Coupling Impairs Associative Memory in Old Age
Anna E. Karlsson, Ulman Lindenberger, Myriam C. Sander
Journal of Neuroscience 2 March 2022, 42 (9) 1752-1764; DOI: 10.1523/JNEUROSCI.1678-21.2021
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Keywords

  • aging
  • associative memory
  • cross-frequency coupling
  • EEG
  • oscillations

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