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Functional dissociation of pre-SMA and SMA-proper in temporal processing
Michael Schwartze1, Kathrin Rothermich, Sonja A Kotz
1Max Planck Institute for Human Cognitive and Brain Sciences, Minerva Research Group Neurocognition of Rhythm in Communication, Leipzig, Germany. schwartze@cbs.mpg.de
Neuroimage
|December 20, 2011
Summary
The supplementary motor area (SMA) has distinct roles in processing temporal information. Its rostral part handles sensory and longer durations, while the caudal part processes sensorimotor and shorter durations.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
Background:
- Temporal structure processing is vital for environmental adaptation.
- The supplementary motor area (SMA) is implicated in temporal processing, but its functional specialization and relation to other temporal networks (cerebellum, cortico-striatal circuits) remain unclear.
- The SMA has anatomical subdivisions: rostral pre-SMA and caudal SMA-proper, with distinct connectivity patterns.
Purpose of the Study:
- To investigate the functional specialization of SMA subareas in temporal processing.
- To clarify the relationship between SMA subregions and cerebellar/cortico-striatal temporal processing networks.
Main Methods:
- A meta-analysis of functional neuroimaging studies was conducted.
- Activations were contrasted based on temporal processing characteristics: sensory, sensorimotor, sequential, non-sequential, explicit, non-explicit, subsecond, and suprasecond.
Main Results:
- Functional differences in SMA subareas were identified, correlating with their anatomical rostro-caudal dimension.
- Rostral SMA (pre-SMA) showed greater involvement in sensory, non-sequential, and suprasecond temporal processing.
- Caudal SMA (SMA-proper) was more associated with sensorimotor, sequential, and subsecond temporal processing.
Conclusions:
- The findings support a functional dissociation between the pre-SMA and SMA-proper in temporal processing.
- This dissociation aligns with their anatomical differentiation and connectivity, suggesting a specialized subcortico-cortical network for temporal information processing.
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