Association between low-frequency oscillation and cognitive compensation in high-performance group: An fNIRS mapping...

Area of Science:

• Neuroscience
• Cognitive Science
• Brain Imaging

Background:

• Brain lateralization enhances cognitive efficiency.
• Aging-related cognitive decline theories (HAROLD, CRUNCH) involve bilateral brain recruitment.
• Mechanisms of cognitive compensation, especially non-aging related ones, are not fully understood.

Purpose of the Study:

• Investigate the relationship between low-frequency oscillation (LFO) and cognitive compensation.
• Explore LFO's role in the prefrontal cortex (PFC) during a working memory task.
• Examine differences in LFO between high- and low-performing individuals.

Main Methods:

• Used functional near-infrared spectroscopy (fNIRS) on 28 young adults performing a visual verbal working memory task.
• Measured changes in oxygenated hemoglobin (Δ[oxy-Hb]), deoxygenated hemoglobin (Δ[deoxy-Hb]), and total hemoglobin (Δ[tot-Hb]).
• Categorized participants into high- and low-performance groups based on task results.

Main Results:

• Both groups showed reduced lateralization and increased PFC activation under cognitive load.
• Only the high-performance group exhibited enhanced Δ[oxy-Hb] LFO power.
• Enhanced Δ[oxy-Hb] LFO power positively correlated with behavioral performance.

Conclusions:

• Insufficient LFO is linked to a lack of cognitive resources, possibly due to impaired cerebral autoregulation (CA).
• This deficiency hinders effective coordination between distant brain regions during cognitive tasks.
• Findings offer new insights into non-aging-related cognitive compensation mechanisms.