A window amplitude discriminator with adjustable upper and lower thresholds

An amplitude window discriminator is described which permits selection of spikes from a multi-unit recording, provided the signal-to-noise ratio is high enough. The device can be built at relatively low cost and time. The circuitry permits analysis of the positive or the negative deflections of the...

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Bibliographic Details
Published in:Pflügers Archiv 1976-01, Vol.364 (2), p.199-202
Main Authors: Ohl, W, Fallert, M
Format: Article
Language:English
Subjects:
Amplifiers, Electronic
Animals
Electronics
Electrophysiology - instrumentation
Neurons - physiology
Rabbits
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Summary:An amplitude window discriminator is described which permits selection of spikes from a multi-unit recording, provided the signal-to-noise ratio is high enough. The device can be built at relatively low cost and time. The circuitry permits analysis of the positive or the negative deflections of the recorded signals. In Part One of the circuitry, the signals are pre-amplified and may be inverted in polarity. In Part Two, the pulses are compared to a variable lower threshold voltage, and low amplitude noise is eliminated. Part Three depicts a logic circuit for elimination of disturbing high-amplitude signals, whose output delivers digital pulses, each corresponding to an original signal (e.g. a neuronal spike) of a certain amplitude.
ISSN:0031-6768
1432-2013
DOI:10.1007/BF00585191