Working memory — Holds ~4 items via sustained firing in the prefrontal cortex. This is your "mental workspace" for reasoning, planning, and language.
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Selective attention — The thalamus acts as a gatekeeper, routing sensory signals to cortical areas. Only a fraction of input reaches awareness.
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Global Workspace Theory — Baars (1988): consciousness arises when information is broadcast widely across cortical networks, making it available to many brain processes simultaneously.
The Subconscious Mind
Basal ganglia · Amygdala · Cerebellum · Brainstem
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Implicit processing — The brain processes ~11 million bits/sec of sensory data; consciousness handles only ~50 bits/sec. Everything else is subconscious.
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Emotional priming — The amygdala evaluates threats in ~12ms, long before conscious awareness (~500ms). Your "gut feeling" is real neural computation.
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Procedural memory — The basal ganglia and cerebellum automate learned skills (walking, driving, language grammar) so consciousness can focus elsewhere.
Bottom-up signals — Subconscious pattern-matching sends "alerts" to consciousness: sudden danger, familiar faces, creative insights. These often arrive as intuitions or emotions.
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Top-down modulation — Conscious intention reshapes subconscious processing via attention and repetition. Meditation, CBT, and habit formation all work this way — rewiring implicit circuits through deliberate practice.
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Predictive coding — The brain constantly generates subconscious predictions; consciousness activates mainly when predictions fail (surprise/error signals). You only "notice" what's unexpected.
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Default Mode Network — During rest, the DMN blends conscious and subconscious processing — daydreaming, self-reflection, and creative incubation happen here.
The Quantum Layer
Quantum biology · Orch OR · Quantum coherence in living systems
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Quantum coherence in photosynthesis — Plants exploit quantum superposition to find the most efficient energy transfer path through protein complexes. Proven experimentally (Fleming, 2007). Biology isn't too "warm and wet" for quantum effects after all.
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Quantum tunneling in enzymes — Hydrogen atoms tunnel through energy barriers in enzyme reactions, dramatically accelerating biochemistry beyond classical predictions.
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Magnetoreception — Birds navigate using quantum entanglement in cryptochrome proteins in their retinas — radical pairs whose spin states are sensitive to Earth's magnetic field.
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Orch OR hypothesis — Penrose & Hameroff propose that consciousness arises from quantum computations in microtubules inside neurons. Objective reduction (OR) of quantum superpositions creates moments of conscious experience. Highly debated — most neuroscientists are skeptical, but microtubule quantum vibrations have been detected.
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The measurement problem — In quantum mechanics, observation collapses a wave function. Some interpretations (von Neumann–Wigner) argue consciousness itself is the observer. Most physicists reject this, but it remains an open philosophical question.