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Identifying a task-invariant cognitive reserve network using task potency.

A C van Loenhoud¹, C Habeck², W M van der Flier³

¹Alzheimer Center Amsterdam, Department of Neurology, Amsterdam Neuroscience, Vrije Universiteit Amsterdam, Amsterdam UMC, 1081 HV, Amsterdam, the Netherlands.

|February 3, 2020

Summary

This summary is machine-generated.

Researchers identified a task-invariant brain network linked to cognitive reserve (CR). This network

Keywords:

Cognitive aging Cognitive reserve Cortical thickness IQ fMRI

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Area of Science:

Neuroscience
Cognitive Psychology

Background:

Cognitive reserve (CR) is hypothesized to mitigate the effects of brain changes on cognitive function.
The neural underpinnings of CR may involve a functional network active across diverse cognitive tasks.

Purpose of the Study:

To investigate the existence of a task-invariant CR network.
To examine the relationship between functional connectivity changes during tasks ('task potency') and cognitive reserve indicators (IQ, education).

Main Methods:

Functional connectivity was measured at rest and during 11 cognitive tasks in 265 healthy adults (20-80 years).
Task potency was calculated and correlated with IQ and education.
A principal component analysis identified a latent variable representing task-invariant CR network potency.

Main Results:

A network of 57 node pairs showed significant correlation between task potency and IQ, but not education, across all cognitive abilities.
This task-invariant network's potency positively predicted episodic memory and fluid reasoning performance.
These associations remained significant even after accounting for cortical thickness.

Conclusions:

The study identifies a task-invariant neural network contributing to cognitive reserve.
This finding enhances understanding of CR mechanisms and may inform the development of CR-enhancing interventions.
The identified network provides a novel operational measure for CR in future research.