Philosophy For Our Times Human perception is imagination | Nadine Dijkstra
May 12, 2026
A deep dive into how the brain distinguishes imagined images from actual perception. They explore how sensory input blends with prior knowledge to create our sense of reality. The conversation covers neural thresholds for reality, implications for mental health, links between AI and neuroscience, and why imagination must be balanced with shared social reality.
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Perception Is An Active Construction
- The brain actively constructs perception by filling in missing information rather than passively recording the world.
- Nadine Dijkstra explains this constructive process is efficient and uses prior knowledge to complete sensory input like a camera with built-in prediction.
Reality Monitoring Is A Brain Mechanism
- Reality monitoring is a measurable brain process that decides whether an experience is imagined or perceived.
- Dijkstra's lab elicits vivid imagery in healthy adults and tracks neural differences when people misattribute imagery as real perception.
Feeling Real Is Brain Interpretation
- Subjective feeling of reality comes from brain interpretation, not an absolute quality of experience.
- Dijkstra rejects the idea that hallucinated experiences (e.g., on psychedelics) are intrinsically more real than consensual perception.