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Sub-perceptual-threshold paired-tVNS speech category training paradigm

Design · All designs
Evidence · 1 claim (1 for) · 1 study (1 causal), q3 · 0 of 1 report an effect size · 1 claim rests on one study

Description

A training paradigm in which transcutaneous auricular vagus nerve stimulation is delivered to the cymba concha and cymba cavum via ear-molded Ag-AgCl electrodes as 15 biphasic square-wave pulses (150 µs pulse width) at 25 Hz, beginning ~300 ms before and continuing 250 ms into each auditory stimulus. "Stimulation was delivered with a pulse amplitude of 0.2 mA below the participant's perceptual threshold", calibrated individually with a 0.1 mA-up/0.3 mA-down staircase, enabling participant blinding. The task itself is trial-based Mandarin tone categorization of 80 natural speech stimuli with visual corrective feedback, followed by a feedback- and stimulation-free Generalization block with novel talkers.

Design Implications

Context

Requirements

  • Individual staircase calibration of perceptual threshold so stimulation stays sub-perceptual and participants can be blinded.
  • Temporal alignment of the pulse train with auditory stimulus onset.

Constraints

  • Amplitude was limited to no higher than 3 mA due to safety restrictions.
  • The article states the frequency of stimulation (25 Hz) was not manipulated and its effects cannot be assessed in this modality.

Target Learners

  • Adult native English speakers unfamiliar with Mandarin Chinese (professional musicians excluded)

Learning Goals

  • Learning to categorize non-native Mandarin tone categories by pitch contour

Claims

Examples

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Key Sources

  • Llanos, F., McHaney, J. R., Schuerman, W. L., Yi, H. G., Leonard, M. K. and Chandrasekaran, B. (2020). Non-invasive peripheral nerve stimulation selectively enhances speech category learning in adults. npj Science of Learning. https://doi.org/10.1038/s41539-020-0070-0
Page metadata
Field Value
type design
id subthreshold-tvns-speech-training-paradigm
title Sub-perceptual-threshold paired-tVNS speech category training paradigm
description A training paradigm in which transcutaneous auricular vagus nerve stimulation is delivered to the cymba concha and cymba cavum via ear-molded Ag-AgCl electrodes as 15 biphasic square-wave pulses (150 µs pulse width) a...
status review
generated by process:settle-candidates on 2026-10-26
trust unverified — no one has confirmed this page's content
sources 1 — llanos-2020

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