A common neural substrate for the control of anticipatory and compensatory postural responses
We have shown previously that reticulospinal neurones (RSNs) in the brainstem pontomedullary reticular formation (PMRF) contribute to the production of the anticipatory postural adjustments (APAs) that precede reaching movements executed in a standing pOSition (Schepens and Drew, 2004, 2006; Schepens, Stapley and Drew, 2008). More recently (Stapley and Drew, 2009), we have also shown that cells in the PMRF contribute to the production of the compensatory responses that are produced by unexpected perturbations (drops) of the support surface from under one paw during quiet stance. In this poster we address the question of whether the same cells in the PMRF contribute to both anticipatory and compensatory responses or whether there are separate populations of neurones contributing to each type of postural response. We recorded the activity of 46 cells (including 41 RSNs) both during reaching movements made with each forelimb and in response to removal of the support surface under each paw.