Abstract
To investigate the role of basal ganglia in locomotion, a multiple-channel, single-unit recording technique was used to record neural activity simultaneously in the dorsal lateral striatum (STR), globus pallidus (GP), subthalamic nucleus (STN) and substantia nigra pars reticulata (SNr) during spontaneous and treadmill locomotion tasks in freely moving rats. Active and quiescent phases appeared alternately in a spontaneous movement session that lasted 60 min. Principal component analysis of the ensemble neural activity from each region revealed a close correlation with spontaneous motor activity. Most of the neurons in these four basal ganglia areas increased their firing rates during the active phase. In the treadmill locomotion task, the firing rates of neurons in all recording areas, especially in the STN, increased significantly during locomotion. In addition, neural responses related to tone cue, initiation and termination of treadmill were observed in a subset of neurons in each basal ganglia region. Detailed video analysis revealed a limb movement related neural firing, predominantly in the STR and the GP, during treadmill walking. However, the proportion of neurons exhibiting limb movement related firing was significantly greater only in the STR. A few neurons in the STR (4.8%) and the GP (3.4%) discharged in an oscillatory pattern during treadmill walking, and the oscillatory frequency was similar to the frequency of the step cycle. This study demonstrates a variety of neural responses in the major basal ganglia regions during spontaneous and forced locomotion. General activation of all major basal ganglia regions during locomotion is more likely to provide a dynamic background for cortical signal processing rather than to directly control precise movements. Implications of these findings in the model of basal ganglia organization are discussed.
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Acknowledgements
This study was supported by NIH grants NS-43441 and NS-45826 to JYC and NS-19608 and AA-10337 to DJW. We thank Ms. Susan Giegel for editing the manuscript.
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Shi, L.H., Luo, F., Woodward, D.J. et al. Neural responses in multiple basal ganglia regions during spontaneous and treadmill locomotion tasks in rats. Exp Brain Res 157, 303–314 (2004). https://doi.org/10.1007/s00221-004-1844-y
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DOI: https://doi.org/10.1007/s00221-004-1844-y