
Inner Cosmos with David Eagleman Ep140 "How does your brain decide what’s true?" with Sam Harris
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Feb 9, 2026 Sam Harris, public intellectual and neuroscientist known for writing on rationality and consciousness, joins to probe why beliefs stick. He discusses belief as brain-driven action, the social roots of truth, why debunking fails, identity’s role in stubbornness, and how science and politics shape disagreement. Short, sharp takes on belief formation and its societal stakes.
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Beliefs As Behavioral Commitments
- Beliefs are commitments the brain makes that shape attention, threat, and action.
- They function as how the brain turns information into behavior and navigation of the world.
Tacit Acceptance Followed By Rejection
- Belief, disbelief, and uncertainty appear to be content-independent mental operations.
- Understanding a statement often tacitly leans toward acceptance before explicit rejection occurs.
Truth Feels Rewarding, False Feels Disgusting
- Rejecting a proposition recruits interoceptive brain regions tied to emotion.
- True statements activate reward-related frontal midline areas, making truth feel rewarding.





