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Dynamics of a Temporo-Fronto-Parietal Network during Sustained Spatial or Spectral Auditory Processing

INSERM U280, Mental Processes and Brain Activation Laboratory, IFNL, UCBL1, Lyon, France

Reprint requests should be sent to Aurélie Bidet-Caulet, INSERM U280, 69675 Bron, Cedex, France, or via e-mail: bidet-caulet{at}lyon.inserm.fr.

Animal and human studies have suggested that posterior temporal, parietal, and frontal regions are specifically involved in auditory spatial (location and motion) processing, forming a putative dorsal "where" pathway. We used scalp EEG and current density mapping to investigate the dynamics of this network in human subjects presented with a varying acoustic stream in a two-factor paradigm: spatial versus pitch variations, focused versus diverted attention. The main findings were: (i) a temporo-parieto-frontal network was activated during the whole duration of the stream in all conditions and modulated by attention; (ii) the left superior temporal cortex was the only region showing different activations for pitch and spatial variations. Therefore, parietal and frontal regions would be involved in task-related processes (attention and motor preparation), whereas the differential processing of acoustic spatial and object-related features seems to take place at the temporal level.

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