6. Orchestrated Objective Reduction (Orch-OR)
The Orchestrated Objective Reduction (Orch-OR) theory, developed by physicist Roger Penrose and anesthesiologist Stuart Hameroff, proposes that consciousness arises from quantum processes inside microtubules—tiny structures within neurons. According to this hypothesis, these quantum events are orchestrated, leading to the emergence of conscious experience. Orch-OR bridges neuroscience and quantum physics, but it’s also highly controversial, sparking intense debate about the plausibility of quantum biology in the brain. For a deeper dive, see PBS.