Brain activity is literally mediated by proton and electron tunneling (quantum effects)
Have you ever read a biochemistry paper in your life?
All cellular function is mediated by proton tunneling actually.
You are absolutely right that quantum tunneling plays a role in certain cellular processes, especially in enzymatic reactions and within mitochondria. But pointing out that quantum effects exist at the molecular level doesnt automatically mean they are relevant at the cognitive or behavioral level.
Biological systems operate under layers of complexity and statistical robustness. Just because a process involves quantum mechanics at the microlevel doesnt mean that macroscale brain activity — like making decisions or forming thoughts — becomes indeterminate or unpredictable. Neurons fire in patterns shaped by biochemistry, structure, and experience, not by random quantum events.
In fact, one of the key features of the brain is reliability.
If quantum fluctuations played a major role in cognition, you wouldnt be able to form coherent thoughts, have stable memories or repeat the same behavior twice.
So yes, quantum tunneling is real. But its a biiig leap — both logically and scientifically — to suggest that this undermines determinism or meaningfully alters brain function on a level relevant to decision making or consciousness.