Abnormal Speech Motor Control in Individuals with 16p11.2 Deletions

Area of Science:

• Neuroscience
• Genetics
• Speech-Language Pathology

Background:

• The 16p11.2 deletion is associated with high prevalence of speech and motor deficits.
• The underlying mechanisms driving these deficits remain largely unknown.
• Understanding these mechanisms is crucial for developing targeted interventions.

Purpose of the Study:

• To investigate fundamental aspects of speech motor control in individuals with the 16p11.2 deletion.
• To examine voice pitch control accuracy and speed in response to auditory feedback perturbations.
• To assess sensorimotor adaptation during speech production under altered auditory feedback.

Main Methods:

• Participants with 16p11.2 deletion and controls performed tasks assessing voice pitch accuracy and speed.
• Participants produced sustained vowels while auditory feedback of formants was manipulated.
• Sensorimotor adaptation was measured by observing responses to consistent auditory feedback changes.

Main Results:

• 16p11.2 deletion carriers demonstrated an exaggerated pitch compensation response to transient auditory feedback perturbations.
• Deletion carriers exhibited reduced sensorimotor adaptation to sustained changes in auditory feedback during vowel production.
• These findings indicate specific impairments in the basic mechanisms of speech motor control.

Conclusions:

• The study suggests fundamental deficits in speech motor control in individuals with the 16p11.2 deletion.
• These impairments in motor control may partially explain the observed speech and language deficits.
• Further research is needed to elucidate the precise neural and genetic underpinnings.