Question

The following is the diagrammatic representation of _______ montage.

(a) 10 – 20 %

(b) 20 – 40 %

(c) 40 – 60 %

(d) 60 – 80 %

The question was posed to me in semester exam.

This key question is from Electroencephalography in chapter Diagnostic Investigation in Neurology and Cardiology of Clinical Science

Answer 1

Correct answer is (a) 10 – 20 %

The explanation is: The placement of the electrodes on the cranium is called as the montage. The 10 – 20% is an internationally accepted standard for the placement of electrodes. The 10 and 20 stand for the distance between the adjacent electrodes is actually 10% or 20% of the total distance of the front-back or right-left length of the skull.