Speech perception and motor control in children with Down syndrome

Area of Science:

• Neurodevelopmental disorders
• Cognitive psychology
• Speech and language pathology

Background:

• Down syndrome (DS) is associated with cognitive and motor challenges.
• Understanding gesture production difficulties in DS is crucial for targeted interventions.
• Apraxia and auditory processing are key areas of investigation.

Purpose of the Study:

• To investigate gesture production in children with Down syndrome using an apraxia battery.
• To identify specific conditions under which children with DS experience difficulties with representational and nonrepresentational gestures.
• To explore the relationship between dichotic listening ear advantage and gesture imitation in children with DS.

Main Methods:

• Twelve children with and without Down syndrome (DS) completed eight subtests of an apraxia battery.
• Participants with DS also underwent a dichotic listening test.
• Performance was analyzed based on gesture type, verbal instruction, context, and visual demonstration.

Main Results:

• Children with DS performed comparably to controls on most apraxia subtests.
• A significant deficit was observed in pantomiming tool use from verbal instruction only.
• Participants with greater left ear advantage on dichotic listening made more errors on verbal-component imitation tasks.

Conclusions:

• Children with DS exhibit specific difficulties in generating actions from memory following verbal instruction.
• Contextual or visual support mitigates gesture production challenges in DS.
• Auditory processing, particularly left ear advantage, may correlate with difficulties in verbal-motor imitation tasks in DS.