Which of the following can be the reason(s) for producing EEG waves?
(i) Exchange of ions across the neural membrane
(ii) Repelling of like-charge ions
(iii) Friction over the scalp
Options:
(a) Only (i)
(b) Only (ii)
(c) Both (i) and (ii)
(d) All the above
Answer: (c) Both (i) and (ii)
Explanation:
In order to maintain the resting membrane potential, neurons are constantly exchanging ions with their external environment. Ions of similar charge repel each other. A large group of ions pushes the neighboring group resulting in the formation of waves. When those waves reach the electrodes on the scalp, they tend to pull/push the electrons of the metal electrode. Thus the difference voltage between two electrodes is recorded over time.
இந்த கேள்வியை இயற்றியது : மதுநிகா (அண்ணா பல்கலைக்கழகம், சென்னை).