Enhancing working memory in MCI: Modulating alpha-gamma coupling and gamma oscillations via rTMS.

Area of Science:

• Neuroscience
• Cognitive Science
• Neuromodulation

Background:

• Cross-frequency coupling (CFC), especially alpha-gamma interactions, is vital for cognitive functions.
• Repetitive transcranial magnetic stimulation (rTMS) shows potential for modulating neural oscillations and cognitive performance.

Purpose of the Study:

• To investigate the effects of high-frequency rTMS (HF rTMS) on CFC and visual working memory (VWM) in individuals with mild cognitive impairment (MCI).

Main Methods:

• Twenty MCI patients and twenty healthy controls received 10Hz rTMS targeting the left dorsolateral prefrontal cortex (DLPFC).
• VWM performance and neural oscillations (alpha and gamma bands) were assessed pre- and post-intervention.

Main Results:

• MCI patients showed significant VWM improvements, particularly under low memory load, after HF rTMS.
• These cognitive gains correlated with reduced occipital gamma activity.
• Strengthened phase-amplitude coupling (PAC) between frontal alpha and occipital gamma oscillations was observed post-rTMS.

Conclusions:

• Alpha-band HF rTMS can effectively modulate neural activity, including CFC, in individuals with MCI.
• This non-invasive neuromodulation technique offers a promising therapeutic strategy for enhancing cognitive function in MCI.