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Preamplifiers used in electroencephalograph have low gain and high noise characteristics for EEG.

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Preamplifiers used in electroencephalograph have low gain and high noise characteristics for EEG.

(a) True

(b) False

This question was addressed to me during an interview for a job.

The above asked question is from Multi-Patient Telemetry topic in portion Biomedical Telemetry of Biomedical Instrumentation

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Correct answer is (b) False

To explain I would say: It is False. Preamplifier used in electroencephalographs must have high gain and low noise characteristics because the EEG potentials are small in amplitude. In addition, the amplifier must have a very high common-mode rejection to minimize stray interference signals from power lines and other electrical equipments.

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