Comparing Electrical and Ultrasound Transcutaneous Auricular Vagus Nerve Stimulation on Associative Memory

Area of Science:

• Neuroscience
• Cognitive Science
• Rehabilitation

Background:

• Associative memory is crucial for cognition and neurorehabilitation.
• Vagus nerve stimulation (VNS) modulates memory circuits.
• Noninvasive VNS modalities like electrical (E-taVNS) and ultrasound (U-taVNS) need comparative efficacy assessment for active recall.

Purpose of the Study:

• To compare the efficacy of E-taVNS and U-taVNS in enhancing associative memory recall.
• To investigate the effects of these modalities on cued recall accuracy and retrieval reaction time.

Main Methods:

• Participants engaged in a cross-modal video-word associative memory task.
• They received either active or sham E-taVNS or U-taVNS.
• Recall accuracy and reaction time were measured before and after stimulation.

Main Results:

• Neither E-taVNS nor U-taVNS significantly improved recall accuracy.
• E-taVNS significantly reduced response times for correctly recalled items.
• U-taVNS did not yield significant improvements in recall or reaction time.

Conclusions:

• E-taVNS shows potential for enhancing memory retrieval efficiency, not necessarily accuracy.
• Further research is needed to optimize U-taVNS parameters and understand underlying mechanisms.
• E-taVNS is a viable tool for memory process facilitation.