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Biomedical subjects

M J Bak

Publications and source records attributed to M J Bak.

11 recordsLinked to original sources
PubMed1979

A pulsed integrator for EMG analysis.

A novel device is described which converts EMG signals to an output which is proportional to the area under the rectified curve in discrete time intervals. This is achieved by resetting a long time constant integrator at the desired rate and saving each integral in a sample/hold circuit for output during the subsequent integration period. This output is particularly useful for quantifying fast reflex events since the signal is integrated without leakage in each period and leaves no residual signal in subsequent periods.

Animals↗
PubMed1977

Long-term unit recording from somatosensory neurons in the spinal ganglia of the freely walking cat.

A new technique has been developed for stable, long-term recording from groups of individual primary afferent neurons in the freely walking cat. A number of fine, flexible wires are inserted into dorsal root ganglia via a small laminotomy in the lumbar spine. The cut end of each wire can record stable and separable action potentials from one to three dorsal root ganglion neurons; each unit has typically held for 1 to 4 days. A broad range of myelinated somatosensory afferent (conduction velocities of 30 to 120 meters per second) have been studies during locomotion. Most cutaneous and proprioceptive afferent studied have been sensitive monitors of complex combinations of step-cycle components, and their firing patterns would often have been difficult to predict from existing information.

Action Potentials↗
PubMed1975

An instrument for stable single cell recording from pulsating human cerebral cortex.

An instrument has been developed for positioning microelectrodes near neurons in the exposed pulsating cerebral cortex of man or animals. The electrode moves with the cortex and maintains a fixed relationship with the desired neuron. Stable extracellular single cell recordings have been obtained for 17.5 min from an exposed human brain that pulsated 1.5 mm at the surface.

Cerebral Cortex↗