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Título: The temporal and spatial organization of the evoked potential in the cat somatosensory cortex : a voltage and a current source density analysis
Autores: Hoeltzell, Perry Bruno
Fecha: 1990
Publicador: McGill University - MCGILL
Fuente:
Tipo: Electronic Thesis or Dissertation
Tema: Biology, Neuroscience.
Descripción: This thesis describes the temporal and spatial organization of the somatosensory evoked potential in the cat in response to small punctate mechanical stimuli applied to the forepaw. The evoked potential was shown to be spatially and temporally stable as well as stationary.
The results of the analysis showed that the evoked potential profiles recorded as a function of cortical depth are the product of an interaction between two populations of neurons, each temporally and spatially distinct from the other. Each population could be activated independently of the other. Each were active at the focus of the potentials. There they produced the classical evoked potential characterized by a reversing polarity as a function of depth. Elsewhere in cortex the populations interacted differently and it was possible to separate the contribution of each.
The current source density method defined the dimensions of the active populations with a precision not available from the potential field analysis thereby confirming their existence and specifying their origins more accurately.
In the discussion, a model is proposed that takes into account these findings in the context of current knowledge of the neuronal connections in the somatosensory cerebral cortex.
Idioma: en