You are correct, single neurons are not intrinsic oscillators in vivo as far as anyone can tell. They could theoretically be -- there are ion channel combinatio

You are correct, single neurons are not intrinsic oscillators in vivo as far as anyone can tell. They could theoretically be -- there are ion channel combinations that would put neurons into an intrinsic oscillatory regime -- but that isn't really seen afaik. Oscillations in the brain arise due to excitatory-inhibitory loops.