AUTHOR=Beloozerova Irina N., Stout Erik E., Sirota Mikhail G.

TITLE=Distinct Thalamo-Cortical Controls for Shoulder, Elbow, and Wrist during Locomotion

JOURNAL=Frontiers in Computational Neuroscience

VOLUME=Volume 7 - 2013

YEAR=2013

URL=https://www.frontiersin.org/journals/computational-neuroscience/articles/10.3389/fncom.2013.00062

DOI=10.3389/fncom.2013.00062

ISSN=1662-5188

ABSTRACT=Recent data from this laboratory on differential controls for the shoulder, elbow, and wrist exerted by the thalamo-cortical network during locomotion is presented, based on experiments involving chronically instrumented cats walking on a flat surface and along a horizontal ladder. The activity of the following three groups of neurons is characterized: 1) neurons of the motor cortex that project to the pyramidal tract (PTNs), 2) neurons of the ventrolateral thalamus (VL), many identified as projecting to the motor cortex (thalamo-cortical neurons, TCs), and 3) neurons of the reticular nucleus of thalamus (RE), which inhibit TCs. Neurons were grouped according to their receptive field into shoulder-, elbow-, and wrist/paw-related categories.  
During simple locomotion, shoulder-related PTNs were most active in the late stance and early swing, and on the ladder, often increased activity and step-related modulation while reducing discharge duration. Elbow-related PTNs were most active during late swing/early stance and typically remained similar on the ladder. Wrist-related PTNs were most active during swing, and on the ladder often decreased activity and increased modulation while reducing discharge duration.
In the VL, shoulder-related neurons were more active during transition from swing to stance. Elbow-related cells tended to be more active during transition from stance to swing and on the ladder often decreased their activity and increased modulation. Wrist-related neurons were more active throughout the stance phase. 
In the RE, shoulder-related cells had low discharge rates and depths of modulation and long periods of activity distributed evenly across the cycle. In contrast, wrist/paw-related cells discharged synchronously during end of stance and swing with short periods of high activity, high modulation, and frequent sleep-type bursting. 
We conclude that thalamo-cortical network processes information related to different segments of the forelimb differe