PMID-7411442 The monkey globus pallidus: neuronal discharge properties in relation to movement.
- motor units are generally inactive during inactivity. the relationship to movement of the discharges of such neurons was found to be very specific
- This is in comparison to other results, which report a sustained firing, esp in GPi.
- the discharges (as analyzed through histograms) of many neurones were related to only a particular direction of movement about one joint in the right limb.
- some discharges were related to multijoint movements -> probably due to control of contraction of particular muscles.
- nonetheless, this relationship was a loose one; there is not a tight coupling between pallidal activity and muscle contraction.
- some responded to ipsilateral as well as contralateral movements.
- PMID-7925805 Unilateral leasions in the GP results in bilateral increase in reaction time. hence, GP is involved in initiation. RT speed eventually recovered.
- only the posterior globus pallidus - well posterior to the maximum expansion - contained movement related cells.
- the a-p stereotaxic coordinates were less useful than the location of the maximum mediolateral width of the structure.
- cells occurred in clusters, separated by regoins of non-movement related.
- cells in the internal segment had no such organization.
- many of the non-movement related neurons were tonically active.
- this was before there was A/D recording, apparently!
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