Noninvasive Neurostimulation to the Inferior Frontal Sulcus or Cerebellum Improves Accuracy But Not Timing in a Speech Motor Learning Task.

ABSTRACT: Speech motor learning depends on phonological working memory mechanisms in left posterior inferior frontal sulcus (LpIFS) and motor learning mechanisms in right cerebellum (RCbm). This study examines how transcranial direct current stimulation (tDCS), applied focally to these regions, affects speech production speed and accuracy when practicing novel syllables containing non-native consonant clusters. Healthy young adults (N = 105) practiced producing four pseudowords containing non-native clusters (e.g., "vzutp") with either anodal stimulation to LpIFS, anodal stimulation to RCbm, or no stimulation (i.e., sham; n = 35 participants per condition). Trained stimuli were produced more quickly and accurately than novel stimuli across all stimulation conditions. Overall accuracy (

SUBMITTER: Rowe HP 

PROVIDER: S-EPMC12534029 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature