Generalized Adaptation to Dysarthric Speech.

Area of Science:

• Speech-language pathology
• Auditory perception
• Neurogenic communication disorders

Background:

• Perceptual learning generalization is understudied in listener adaptation to dysarthric speech.
• Understanding how prior experience impacts adaptation to dysarthric speakers is crucial for effective interventions.

Purpose of the Study:

• To investigate if listener adaptation to dysarthric speech depends on familiarization talker's perceptual similarity and intelligibility.
• To determine the predictive value of prior experience on listener adaptation to dysarthric speech.

Main Methods:

• 160 listeners underwent an intelligibility pretest with an ataxic dysarthric talker.
• Familiarization occurred with one of seven dysarthric talkers (varying in perceptual similarity and intelligibility) or a control talker.
• Listeners completed an intelligibility posttest with the original dysarthric talker.

Main Results:

• All listeners showed improved adaptation after familiarization with a dysarthric talker.
• Superior adaptation occurred when the familiarization talker shared similar perceptual features.
• Adaptation was reduced when the familiarization talker had low intelligibility.

Conclusions:

• Listener adaptation to dysarthric speech demonstrates both generalization and specificity of learning.
• Prior familiarization experiences significantly influence adaptation to dysarthric speakers.
• Findings inform theoretical models of speech adaptation and clinical training paradigms for dysarthria.