Electrons only have random locations in atomic orbitals. If they were totally random then sometimes they would attract each other and sometimes they would repulse each other randomly. Not to mention the variance in their location is extremely small and still would not affect brain processes. In conclusion, electrons do behave randomly in some circumstances but they variance is too small to majorly affect macro-level phenomenon also such variance can be statistically predicted.

Quantum fluctuations and other Planck-scale phenomenon would be largely ineffective int terms of altering brain processes. The probability of such randomness happening anywhere let alone in your brain is very statistically unlikely also the most it could do is make generate a pion or quark or something which really would not affect your brain's processes.

Electrons only have random locations in atomic orbitals. If they were totally random then sometimes they would attract each other and sometimes they would repulse each other randomly. Not to mention the variance in their location is extremely small and still would not affect brain processes. In conclusion, electrons do behave randomly in some circumstances but they variance is too small to majorly affect macro-level phenomenon also such variance can be statistically predicted.