Modeling the Anisotropic Conductivity of the Cerebral Cortex.
Abstract
This thesis is twofold in purpose. First, it reports an attempt to construct a device that models the usually assumed anisotropic conductivity of the cerebral cortex. The model device is based on known cortical anatomy. The anisotropicity is assumed to result from non-conductive myelin sheaths surrounding axonal conductive system which interconnect various locations on the cortical surface. No electronically measurable anistropicity was found in the model although it is clearly anisotropic in structure. Second, an investigation was made into the transfer function through Ag/AgCl electrodes when used to detect an electrical signal arising in a saline medium. It was determined that the value of the series equivalent capacitance was a function of the type of wave that was being detected, the narrower the pulse the higher the value of the capacitance. This result implies that when a signal is sampled periodically rather than continuously it has a lower apparent internal impedance and can be used to drive a device with a lower input resistance without the signal distortion normally consequent to low resistance detection circuits. Keywords: Brain Construction; Dipole electrodes; Theses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1986
- Accession Number
- ADA178868
Entities
People
- William J. Szarek
Organizations
- Air Force Institute of Technology