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Non-linear Functional Brain Co-activations in Short-Term Memory Distortion Tasks.

Anna Ceglarek¹, Jeremi K Ochab², Ignacio Cifre³

¹Department of Cognitive Neuroscience and Neuroergonomics, Institute of Applied Psychology, Jagiellonian University, Krakow, Poland.

Frontiers in Neuroscience

|December 20, 2021

Summary

This study explored how time of day affects false memory formation using advanced fMRI analysis. Results show significant differences in brain activity patterns related to memory, depending on the time of day and memory type.

Keywords:

DRM paradigm fMRI functional dynamic connectivity memory distortions non-linear correlations point process analysis short-term (working) memory

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Area of Science:

Cognitive Neuroscience
Neuroimaging

Background:

Previous research highlights the neural basis of true and false recognition, and the impact of circadian rhythms on cognition.
Investigating the interplay between time of day and memory processes is crucial for understanding cognitive variability.

Purpose of the Study:

To examine the modulation of false memory formation by the time of day.
To apply a novel non-linear correlation analysis, typically used for resting-state fMRI, to task-based fMRI data.
To assess the effectiveness of this analytical method in characterizing fMRI task paradigms.

Main Methods:

Fifty-four healthy young adults participated in two sessions (morning and evening) within an MRI scanner.
Participants completed a modified Deese-Roediger-McDermott paradigm to assess short-term memory and false memory formation.
Blood-oxygen-level-dependent (BOLD) activity was analyzed using a general linear model incorporating non-linear correlations with stimuli, distinguishing encoding and retrieval phases.

Main Results:

Non-linear correlation measures demonstrated significant dependence on the time of day and the type of memory probe (positive vs. lure).
Distinct correlation patterns were observed in hippocampal regions when differentiating between positive and lure probes.
The study confirmed the known influence of time of day on cognitive performance.

Conclusions:

The time of day significantly modulates false memory formation, impacting neural activity patterns.
Non-linear correlation analysis proves effective for analyzing task-based fMRI data and characterizing cognitive paradigms.
This method offers a novel approach to understanding the neural underpinnings of memory and cognitive timing.