Abstract
The human auditory cortex comprises the supratemporal plane and large parts of the temporal and parietal convexities. We have investigated the relevant intrahemispheric cortico-cortical connections using in vivo DSI tractography combined with landmark-based registration, automatic cortical parcellation and whole-brain structural connection matrices in 20 right-handed male subjects. On the supratemporal plane, the pattern of connectivity was related to the architectonically defined early-stage auditory areas. It revealed a three-tier architecture characterized by a cascade of connections from the primary auditory cortex to six adjacent non-primary areas and from there to the superior temporal gyrus. Graph theory-driven analysis confirmed the cascade-like connectivity pattern and demonstrated a strong degree of segregation and hierarchy within early-stage auditory areas. Putative higher-order areas on the temporal and parietal convexities had more widely spread local connectivity and long-range connections with the prefrontal cortex; analysis of optimal community structure revealed five distinct modules in each hemisphere. The pattern of temporo-parieto-frontal connectivity was partially asymmetrical. In conclusion, the human early-stage auditory cortical connectivity, as revealed by in vivo DSI tractography, has strong similarities with that of non-human primates. The modular architecture and hemispheric asymmetry in higher-order regions is compatible with segregated processing streams and lateralization of cognitive functions.
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Abbreviations
- AA:
-
Anterior auditory area
- ALA:
-
Anterolateral auditory area
- LA:
-
Lateral auditory area
- LP:
-
Lateroposterior auditory area
- MA:
-
Medial auditory area
- PA:
-
Posterior auditory area
- PAC:
-
Primary auditory cortex
- STA:
-
Superior temporal auditory area
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This work has been supported by the Swiss National Science Foundation Grants 3200030-124897 and 320030B-141177 to S. Clarke. PH was supported by Leenaards Foundation.
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Cammoun, L., Thiran, J.P., Griffa, A. et al. Intrahemispheric cortico-cortical connections of the human auditory cortex. Brain Struct Funct 220, 3537–3553 (2015). https://doi.org/10.1007/s00429-014-0872-z
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DOI: https://doi.org/10.1007/s00429-014-0872-z