An expanded role for the dorsal auditory pathway in sensorimotor control and integration

Area of Science:

• Neuroscience
• Auditory Processing
• Cognitive Science

Background:

• The dual-pathway model posits two auditory processing streams: antero-ventral for object identification and postero-dorsal for sound localization.
• Evidence suggests the postero-dorsal stream also plays a role in human speech and language functions.

Purpose of the Study:

• To corroborate and expand upon a proposed structural forward model for the postero-dorsal auditory pathway.
• To integrate recent evidence supporting a unified model for auditory spatial and speech processing.

Main Methods:

• Review and synthesis of existing neuroscientific evidence from human and nonhuman primate studies.
• Discussion of recent findings in relation to the proposed forward model.

Main Results:

• The postero-dorsal pathway's functions in sound localization and speech processing can be unified under a single structural forward model.
• This model involves efference copy from prefrontal/premotor cortex for optimal state estimation in parietal and posterior auditory areas.

Conclusions:

• The proposed forward model provides a cohesive framework for understanding the dual functions of the postero-dorsal auditory stream.
• This model highlights the role of efference copy in integrating auditory spatial and speech-related information.