Description

Correlating system for brain potentials, including a magnetic tape reader and recorder by Ampex Lamda Electronics Corporation, and four dial panel and cord.

Additional Information

Using standard electroencephalographic equipment and a multi-channel FM magnetic tape recorder, the analog correlator provides an analysis of the electrophysiological phenomena of the brain. The five important components of the system include a delay mechanism (the magnetic drum), a multiplier, an integrator, a timer and a plotter. The magnetic drum, a modified version of Dr. Goff's system at the M.I.T. Acoustics Laboratory, introduces a relative time delay between two channels and can be altered either by hand or automatically. FM signals are recorded on the drum by the drum amplifier, then go through the switching unit to the Ampex playback amplifier. The original data, in the delayed form, goes then to the multiplier and integrator where the time functions are computed. The final result is a correlogram which reveals information about neural pathways and activty. The Analog Correlator System was designed and constructed under the direction of Professor W. A. Rosenblith of M.I.T., an expert in biophysics and a researcher in the electrical phenomena of the brain, hearing and sensory communication. See RLE Technical Report #300: "An Analog Correlator System for Brain Potentials", Barlow, Dr. John S. and Robert M. Brown. Also mentioned in Barlow article in last volume of Collected Papers of N. Wiener by MIT Press.