Abstract
Objectives
To investigate functional cerebral abnormalities in patients with amyotrophic lateral sclerosis (ALS) using functional magnetic resonance imaging (fMRI) during action observation.
Methods
Thirty patients with ALS and 30 matched healthy controls underwent fMRI with an experimental paradigm while observing a video of repetitive flexion-extension of the fingers at three frequency levels or three complexity levels, alternated with periods of a static hand. A parametric analysis was applied to determine the effects of each of the two factors.
Results
Action observation activated similar neural networks as the research on execution of action in the ALS patients and healthy subjects in several brain regions related to the mirror-neuron system (MNS). In the ALS patients, in particular, the dorsal lateral premotor cortex (dPMC), inferior parietal gyrus (IPG), and SMA, were more activated compared with the activation in the controls. Increased activation within the primary motor cortex (M1), dPMC, inferior frontal gyrus (IFG), and superior parietal gyrus (SPG) mainly correlated with hand movement frequency/complexity in the videos in the patients compared with controls.
Conclusions
The findings indicated an ongoing compensatory process occurring within the higher order motor-processing system of ALS patients, likely to overcome the loss of function.
Key Points
• Action observation activated similar core nodes of MNS in ALS and controls.
• Increased activation within M1, dPMC, IFG and SPG mainly correlated with hand movement frequency/complexity.
• Differences in patients and controls may be due to compensatory processes in ALS.
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Abbreviations
- AAL:
-
Automated anatomical labeling
- ALS:
-
Amyotrophic lateral sclerosis
- ALSFRS-R:
-
Revised ALS functional rating scale
- BCI:
-
Brain–computer interface
- dPMC:
-
Dorsal lateral premotor cortex
- EPI:
-
Echo-planar imaging
- FLAIR:
-
Fluid-attenuated inversion recovery
- fMRI:
-
Functional magnetic resonance imaging
- IFG:
-
Inferior frontal gyrus
- M1:
-
primary motor cortex
- MNS:
-
Mirror neuron system
- MPRAGE:
-
Magnetization prepared rapid acquisition of gradient echo
- SMA:
-
Supplementary motor area
- SPM8:
-
Statistical Parametric Mapping 8
- SPG:
-
Superior parietal gyrus
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Acknowledgements
The scientific guarantor of this publication is Daoying Geng. The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article. The authors state that this work has not received any funding. No complex statistical methods were necessary for this paper. Institutional Review Board approval was obtained. Written informed consent was obtained from all subjects (patients) in this study. Approval from the institutional animal care committee was not required because our study is on human subjects. No study subjects or cohorts have been previously reported. Methodology: case–control study.
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Li, H., Chen, Y., Li, Y. et al. Altered cortical activation during action observation in amyotrophic lateral sclerosis patients: a parametric functional MRI study. Eur Radiol 25, 2584–2592 (2015). https://doi.org/10.1007/s00330-015-3671-x
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DOI: https://doi.org/10.1007/s00330-015-3671-x