Manipulating speech perception with amplitude-modulated kilohertz magnetic perturbation (AM-kTMP)

Area of Science:

• Neuroscience
• Auditory Perception
• Brain Stimulation

Background:

• Speech perception relies on neural entrainment to rhythmic speech properties.
• Transcranial alternating current stimulation (tACS) can modulate neural oscillations and perceptual sensitivity.

Purpose of the Study:

• To investigate kilohertz transcranial magnetic perturbation (kTMP) as a novel non-invasive brain stimulation (NIBS) method.
• To assess kTMP's ability to modulate neural activity and perceptual sensitivity during speech perception.

Main Methods:

• Utilized kilohertz transcranial magnetic perturbation (kTMP) with a 3.125 Hz amplitude modulation (AM) component.
• Applied kTMP over the temporal lobe in human participants (n=40) listening to rhythmic speech.
• Compared AM-kTMP effects to sham stimulation, measuring perceptual sensitivity and side effects.

Main Results:

• AM-kTMP significantly increased the phasic modulation of perceptual sensitivity compared to sham stimulation.
• kTMP demonstrated greater cortical electrical field induction and reduced cutaneous co-stimulation versus tACS.
• No significant differences in rhythmic sensations or side effects were reported between AM-kTMP and sham conditions.

Conclusions:

• AM-kTMP successfully entrains neural activity related to speech perception.
• kTMP is a promising NIBS technique for frequency-specific modulation of brain dynamics in auditory processing.
• kTMP offers advantages over tACS due to enhanced electrical field generation and reduced peripheral stimulation.