In an earlier study, we found that the encoding of limb position in the sagittal plane across the population of spinocerebellar Purkinje cells was anisotropic with a preferential gradient along horizontal direction. The aim of this study was to extend to a three-dimensional workspace the analysis of the relationships between Purkinje cells activity and rat’s forelimb spatial position. In anesthetized animals, the extracellular activity of 121 neurons was recorded while a robot passively placed the limb in 18 positions within a cubic workspace (333 cm). In order to characterize the relationship between spatial locations and Purkinje cell activity we performed a backward stepwise regression starting from a model with three independent variables representing the antero- posterior, the medial–lateral and the vertical axes of workspace. Regression analysis showed that the firing of most cells was modulated exclusively along the antero-posterior (25%) or the medial–lateral (38%) axis, while a small portion was related only to the vertical axis (8%), indicating a generalized nonuniform sensitivity of Purkinje cells to limb displacement in 3D space. © 2006 Published by Elsevier Ltd on behalf of IBRO.
|Titolo:||Spatial anisotropy in the encoding of three-dimensional passive limb position by the spinocerebellum|
|Data di pubblicazione:||2007|
|Citazione:||Spatial anisotropy in the encoding of three-dimensional passive limb position by the spinocerebellum / VALLE M; CASABONA A; BOSCO G; PERCIAVALLE V. - In: NEUROSCIENCE. - ISSN 0306-4522. - 144(2007), pp. 783-787.|
|Appare nelle tipologie:||1.1 Articolo in rivista|