| Autor: |
Lazzari G; Department of Brain and Behavioral Sciences, University of Pavia, 27100 Pavia, Italy., van de Vorst R; Centre for Research on Brain, Language and Music (CRBLM), Montreal, QC H3A 1G1, Canada.; School of Communication Sciences and Disorders, McGill University, Montreal, QC H3G 1Y6, Canada., van Vugt FT; Centre for Research on Brain, Language and Music (CRBLM), Montreal, QC H3A 1G1, Canada.; Psychology Department, University of Montreal, Montreal, QC H3T 1J4, Canada.; International Laboratory for Brain, Music and Sound Research (BRAMS), Montreal, QC H3T 1J4, Canada., Lega C; Department of Brain and Behavioral Sciences, University of Pavia, 27100 Pavia, Italy. |
| Abstrakt: |
Differences in sensorimotor integration mechanisms have been observed between people who stutter (PWS) and controls who do not. Delayed auditory feedback (DAF) introduces timing discrepancies between perception and action, disrupting sequence production in verbal and non-verbal domains. While DAF consistently enhances speech fluency in PWS, its impact on non-verbal sensorimotor synchronization abilities remains unexplored. A total of 11 PWS and 13 matched controls completed five tasks: (1) unpaced tapping; (2) synchronization-continuation task (SCT) without auditory feedback; (3) SCT with DAF, with instruction either to align the sound in time with the metronome; or (4) to ignore the sound and align their physical tap to the metronome. Additionally, we measured participants' sensitivity to detecting delayed feedback using a (5) delay discrimination task. Results showed that DAF significantly affected performance in controls as a function of delay duration, despite being irrelevant to the task. Conversely, PWS performance remained stable across delays. When auditory feedback was absent, no differences were found between PWS and controls. Moreover, PWS were less able to detect delays in speech and tapping tasks. These findings show subtle differences in non-verbal sensorimotor performance between PWS and controls, specifically when action-perception loops are disrupted by delays, contributing to models of sensorimotor integration in stuttering. |
