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GATE 2022 BM – Question 30

Sensors and Bioinstrumentation · Biopotentials and Electrodes · 1 mark · Multiple select

Which statements about biomedical electrical measurements are true?

  1. ENG measures electrical activity of peripheral neurons
  2. EOG measures retinal electrical response to light stimulation
  3. EEG gamma waves have higher frequency than beta, delta and theta waves
  4. The ECG P wave represents ventricular repolarization

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Correct answer: (A) ENG measures electrical activity of peripheral neurons; (C) EEG gamma waves have higher frequency than beta, delta and theta waves

Explanation

Electroneurography records peripheral nerve electrical activity, A. Gamma EEG activity is higher in frequency than the named bands, C. Retinal light response is measured by ERG rather than EOG, which mainly tracks the corneo-retinal standing potential/eye motion. P represents atrial depolarization, not ventricular repolarization. Thus A,C.

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