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Bimodal (auditory and visual) left frontoparietal circuitry for sensorimotor integration and sensorimotor learning
M Iacoboni1, R P Woods, J C Mazziotta
1Department of Neurology, Neuropsychiatric Institute, UCLA School of Medicine, USA. iacoboni@loni.ucla.edu
Brain : a Journal of Neurology
|November 25, 1998
Summary
Human premotor and parietal areas equally process auditory and visual sensorimotor integration and learning. This study reveals functional fractionation within the dorsal premotor cortex, mirroring findings in non-human primates.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Motor Control
Background:
- Human premotor and posterior parietal cortex are crucial for sensorimotor control.
- Previous research in non-human primates suggests these areas handle auditory and visual sensorimotor transformations similarly.
- The extent to which human homologues subserve equivalent sensorimotor processing remains to be fully elucidated.
Purpose of the Study:
- To investigate if human premotor and posterior parietal areas perform basic sensorimotor integration and learning equivalently for both auditory and visual stimuli.
- To compare human findings with established knowledge from non-human primate studies.
- To identify potential functional subdivisions within the human dorsal premotor cortex.
Main Methods:
- Positron Emission Tomography (PET) was used to measure brain activity.
- Healthy human subjects performed a spatial compatibility task involving auditory and visual stimuli.
- Participants responded with ipsilateral or contralateral hand movements based on stimulus modality and location.
Main Results:
- Reaction times were significantly faster in compatible compared to incompatible conditions for both auditory and visual stimuli.
- Increased blood flow was observed in the left rostral dorsal premotor and posterior parietal cortex during the incompatible condition for both modalities.
- Blood flow increases in the left caudal dorsal premotor cortex correlated with reaction time learning curves across both auditory and visual stimuli.
Conclusions:
- Human frontoparietal areas, including premotor and posterior parietal regions, can subserve basic sensorimotor transformations for auditory and visual stimuli equivalently.
- The findings support a functional rostrocaudal fractionation of the human dorsal premotor cortex, analogous to that observed in non-human primates.
- This study provides evidence for conserved sensorimotor processing mechanisms across species in key cortical areas.