Presentation

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Corrective and Adaptive Responses to Auditory Errors

Poster A64 in Poster Session A, Tuesday, October 24, 10:15 am - 12:00 pm CEST, Espace Vieux-Port

Ayoub Daliri¹; ¹Arizona State University

Auditory perturbations are powerful techniques, offering invaluable insight into the processes of speech motor learning. In response to perturbations, subjects produce corrective and adaptive responses, reflecting the contributions of the feedback and feedforward control systems, respectively. To measure corrective responses, studies have applied perturbations on a set of randomly selected trials—the compensation paradigm. To measure adaptive responses, studies have applied perturbations on several successive trials—the adaptation paradigm. However, these paradigms measure the contributions of the control systems in isolation, discounting the bidirectional interactions between the two systems. These paradigms are also time-consuming, making it particularly challenging to examine the control systems in patient populations and children. Therefore, we developed a novel paradigm to address these limitations; in our novel paradigm, we (1) concurrently measured corrective and adaptive responses and (2) determined the sensitivity of both feedback and feedforward systems to different error magnitudes. Our paradigm consisted of several blocks of trials. In each trial, subjects produced a target word (e.g., “head”) while receiving perturbed auditory feedback. We frequently changed the perturbation magnitude and direction to measure feedback-driven responses (resembling a compensation paradigm). We delivered the perturbations for several succeeding trials to measure the adaptive responses (resembling an adaptation paradigm). Perturbations were randomly selected from 7 different perturbation configurations. We measured subjects’ early responses (0–100 ms) and late responses (200–300 ms). As a measure of feedforward error sensitivity, we used early responses (i.e., adaptive responses), and as a measure of feedback error sensitivity, we used the difference between late and early responses (i.e., corrective responses). We recruited 30 healthy adults to complete this study. Our preliminary results showed that, as the perturbation magnitude increased, the magnitude of the corrective responses and adaptive responses increased. However, the magnitude of responses reached a plateau at large perturbation magnitudes. These results are consistent with previous compensation and adaptation studies’ results.

Topic Areas: Speech Motor Control, Computational Approaches