Audio-visual multisensory integration and haptic perception are altered in adults with developmental coordination...

Area of Science:

• Neuroscience
• Developmental Psychology
• Motor Control

Background:

• Developmental Coordination Disorder (DCD) is characterized by motor difficulties.
• Atypical sensory processing is hypothesized to contribute to motor atypicality in DCD.
• The domain-specificity of sensory alterations in DCD remains unclear.

Purpose of the Study:

• To investigate domain-specific vs. global sensory processing alterations in adults with DCD.
• To examine haptic perception and audio-visual integration in individuals with DCD.
• To explore the relationship between sensory processing, spatiotemporal integration, and DCD symptom severity.

Main Methods:

• Assessed haptic perception, audio-visual integration (sound-induced double flash illusion), and spatiotemporal integration (Tau-Kappa effects).
• Compared sensory processing in adults with DCD (N=16), possible DCD (pDCD, N=12), and neurotypical adults (NT, N=28).
• Correlated sensory processing measures with self-reported DCD symptom severity.

Main Results:

• Reduced haptic perception was observed in both DCD and DCD+pDCD groups compared to NT adults.
• Audio-visual integration was reduced specifically in the DCD group, not the extended DCD+pDCD group.
• Spatiotemporal integration abilities (Tau-Kappa effects) were intact in all groups; sensory deficits correlated with DCD symptom severity.

Conclusions:

• Altered low-level sensory processing (haptic, audio-visual) is present in DCD.
• Sensory processing differences are domain-specific rather than global in DCD.
• Perceptual atypicalities likely contribute to motor difficulties in DCD through internal modeling mechanisms.