​The electrodes (also called leads) used for human electroencephalography in a 10-20 lead system are labeled with an uppercase letter and a subscript number or a letter. Which one of the following is INCORRECT meaning of the labels of electrodes?​

Correct option is C

Explanation-

Option a : "The uppercase letter is an abbreviation of the location of electrode on the head"  - CORRECT
For example:
F = Frontal
C = Central
P = Parietal
O = Occipital
T = Temporal
Option b : "The electrodes over left hemisphere are labeled with a subscript odd number along with the uppercase letter"  - CORRECT
Odd numbers (1, 3, 5, 7) indicate left hemisphere placements.
Option c : "The electrodes on the midline of head are labeled with the subscript letter x along with the uppercase letter" - INCORRECT
Midline electrodes are labeled with the number 0 (not "x").
Example: Fz, Cz, Pz – the 'z' stands for "zero line" or midline.
Option d : "The electrodes over right hemisphere are labeled with a subscript even number along with the uppercase letter" - CORRECT
Even numbers (2, 4, 6, 8) are used for right hemisphere placements.

Final Answer:
Statement c is incorrect, hence Option c is the right choice for the question.









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