Noisy brain activity contributes to aging-related navigation impairments

Noisy brain activity contributes to aging-related navigation impairments
In younger adults, hippocampal activity decreases and acitivty in other navigational areas increases. The pattern is not seen in older adults. Credit: Diersch et al., JNeurosci 2021

Too much activity in the hippocampus may cause navigation impairments seen in aging adults, according to new research published in JNeurosci.

Spatial navigation is one of the that declines sharply in old age. Older adults often have difficulty navigating new environments and will choose to stick with familiar ones. Plus, key regions in the brain's navigation circuit are some of the first affected by Alzheimer's disease. In a recent study, Diersch et al. examined the neural mechanism behind this decline in spatial learning.

In the study, younger and (without known cognitive impairments) learned the layout of a town through virtual reality software. After touring the town, participants estimated the location of different landmarks while their was measured with fMRI. Most older adults did not perform as well as the younger adults and took longer to learn the layout of the town. As the younger adults learned and their performance improved, activity in the hippocampus decreased while activity in other navigation areas increased. This pattern was not seen in older adults. A failure to inhibit hippocampal activity could make brain signals too noisy, hindering performance.

Reducing hippocampal activity could become a treatment option for improving memory performance in aging adults.


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More information: Increased Hippocampal Excitability and Altered Learning Dynamics Mediate Cognitive Mapping Deficits in Human Aging, JNeurosci (2021). DOI: 10.1523/JNEUROSCI.0528-20.2021
Journal information: Journal of Neuroscience

Citation: Noisy brain activity contributes to aging-related navigation impairments (2021, March 1) retrieved 7 May 2021 from https://medicalxpress.com/news/2021-03-noisy-brain-contributes-aging-related-impairments.html
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