RF powering of millimeter- and submillimeter-sized neural prosthetic implants.
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Electric Conductivity↗
Biomedical subjects
W J Heetderks
Publications and source records attributed to W J Heetderks.
Laser-induced fabrication of a transsubstrate microelectrode array and its neurophysiological performance.
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Animals↗
Principal component analysis of neural population response of knee joint proprioceptors in cat.
(1) A means of describing the response of neural populations based on principal component analysis is presented. The analysis produces response descriptions that indicate whether two states are distinguishable and suggest how to best distinguish between states. (2) Analysis of slowly adapting joint receptor data from the cat knee joint indicates that the joint receptors are capable of signalling limb position in the range from 150 degrees to 180 degrees of extension during an extension movement. They also provide information which indicates whether the tibia is twisted inward or outward in this range of angles. (3) The first principal component in the response to a constant velocity extension of 8 simultaneously active units described 86% of the total mean square discharge displayed by all 8 units. The first principal component is qualitatively similar to the responses observed in slowly adapting thalamic joint units.
Animals↗
Criteria for evaluating multiunit spike separation techniques.
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Action Potentials↗
Real time correlator for detecting single units in peripheral nerve.
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Animals↗
The Humongotron--a scintillation-camera transaxial tomograph.
An emission transaxial tomographic system using a scintillation camera as the detector is described. The unit allows accurate positioning of a scintillation camera's detector at any angle around a patient in order to obtain the multiple projection images needed for transaxial tomography, and it is capable of imaging any area of the body. The camera can also be used for all types of conventional imaging procedures. Image processing is performed by a small on-line computer. A convolution algorithm and a mathematical technique for approximate absorption correction are used to obtain high-resolution and high-contrast images with good quantitative accuracy. The operation of the system is described and representative phantom and patient studies are presented to illustrate the capabilities of the system.
Brain Neoplasms↗
Partition of gross peripheral nerve activity into single unit responses by correlation techniques.
The neural activity in the medial articular nerve is partitioned on the basis of conduction velocity by correlation techniques. Because of the small number of cat knee joint units (two to ten) responding under a prescribed set of rotational conditions, it is possible to partition and simultaneously study the units' responses to periodic joint articulation waveforms.
Action Potentials↗