Pontogeniculo-occipital spike is characteristic of which of the following sleep stage?: (A) Stage 1 NREM, (B) Stage 2 NREM, (C) Stage 3 NREM, (D) REM
Answer is D. Ponto - geniculo - occipital spikes are large phasic potentials, seen in REM sleep. These orginate from cholinergic neurons in pons and pass rapidly to lateral geniculate body and then to occipital coex.