Question

What is the typical frequency range of standard EEG machines?

(a) 0.025 to 0.05 Hz

(b) 0.05 to 0.1 Hz

(c) 0.1 to 70 Hz

(d) 70 to 140 Hz

The question was asked during an online exam.

This intriguing question comes from Measurement of Heart Rate in portion Patient Monitoring System of Biomedical Instrumentation

Answer 1

Right option is (c) 0.1 to 70 Hz

Explanation: The typical frequency range of standard EEG machines is from 0.1 Hz to 70 Hz, though newer machines allow the detection and filtering of frequencies up to several hundred Hertz. This may be of importance in some intracranial recordings.