Modern WisdomConsidering Consciousness | Dr Heather Berlin | Modern Wisdom Podcast 146
CHAPTERS
- 0:00 – 0:48
Cold open: Why believing in free will changes your behavior
Heather Berlin explains research showing that undermining people’s belief in free will can increase unethical behavior, like cheating. She frames free will (or the feeling of it) as an adaptive illusion that supports social responsibility and self-regulation.
- 0:48 – 2:36
Meet Heather Berlin: mapping consciousness and the unconscious mind
Chris introduces Heather, and she outlines her core scientific mission: understanding how physical brain activity generates subjective experience. She also emphasizes how much of behavior is driven by unconscious processes and post-hoc storytelling.
- 2:36 – 4:44
Defining consciousness: subjective experience and the limits of measurement
They settle on a practical definition of consciousness as first-person subjective experience—“what it feels like” to taste, see, or smell. Heather highlights the methodological challenge: science often relies on self-report, with only indirect proxies for babies and animals.
- 4:44 – 8:58
Animal consciousness and Integrated Information Theory (IIT)
Chris asks how far consciousness extends down the animal kingdom. Heather discusses behavioral evidence (e.g., fish pain responses) and introduces IIT, including the idea of “phi” as a measure of integrated information—raising panpsychism-like implications.
- 8:58 – 12:30
Theory vs experiment: studying disorders to understand brain mechanisms
Heather explains how big theories become testable through practical research—often in psychiatry. By correlating symptoms with brain circuitry, researchers can design treatments to target impulsivity, compulsions, and other dysfunctions.
- 12:30 – 14:33
Psychedelic medicine’s resurgence: what’s new and why it’s promising
The conversation turns to emerging therapies using MDMA, ketamine, and psilocybin for PTSD, depression, and anxiety. Heather argues psychiatry is entering a period of major breakthroughs after decades of incremental drug changes.
- 14:33 – 17:00
What psychedelics do in the brain: ego, rumination, and network ‘openness’
Heather describes how classic psychedelics (e.g., psilocybin/LSD) alter serotonin systems and shift large-scale brain network dynamics. Reduced ego/self processing and disrupted rumination can help loosen rigid depressive/anxious loops, while new global connectivity supports novel perspectives.
- 17:00 – 19:54
Why one session can matter: one-trial learning and lasting perspective shifts
Chris asks how a single profound experience can create long-term change. Heather connects psychedelic breakthroughs to ‘one-trial learning’—evolutionary mechanisms where intense experiences rapidly reshape future behavior, then consolidate into new habits and pathways over time.
- 19:54 – 23:14
MDMA-assisted therapy for PTSD: accessing and reconsolidating trauma
Heather explains MDMA therapy as a way to revisit traumatic memories without overwhelming fear, enabling safer processing. The goal is to bring suppressed material into conscious access and reintegrate it so triggers no longer automatically produce intense distress.
- 23:14 – 30:31
How perception becomes conscious: visual pathways, feedback loops, and hallucinations
They revisit the ‘how does the elephant appear in the mind?’ puzzle via vision science. Heather describes sensory flow (retina → thalamus → visual cortex) and the importance of recurrent feedback to prefrontal regions for conscious perception, plus how imagination and perception overlap in the brain—and what breaks in schizophrenia.
- 30:31 – 39:06
Thoughts, suppression, and impulse control: OCD, meditation, and ‘leaning in’
Heather explains why thoughts often arise unbidden and why suppressing them backfires (the “don’t think of an elephant” effect). Using OCD as an example, she distinguishes control over thoughts vs control over behavior, and connects therapeutic exposure/response prevention and meditation to observing thoughts without reacting.
- 39:06 – 49:09
Free will, determinism, and the adaptive illusion of agency
Heather walks through classic Libet-style findings and modern prediction studies suggesting decisions begin unconsciously before awareness. She argues we may lack ‘free will’ in the philosophical sense, but still have evolved self-control via the prefrontal ‘brake’ system—while belief in agency remains socially and morally functional.
- 49:09 – 1:03:22
Self as a construct: continuity, memory, and ego dissolution
They extend the ‘illusion’ idea to the self: identity feels continuous despite constant biological and neural change. Heather links selfhood to distributed brain networks and memory systems, notes how memory loss disrupts identity, and connects ego dissolution (sometimes via psychedelics) to therapeutic relief from self-conscious rumination.
- 1:03:22 – 1:05:42
Closing reflections: embracing consciousness + Heather’s upcoming book on control
Heather argues that consciousness is a rare opportunity—‘sandwiched between two eternities’—worth experiencing fully, even with discomfort. They wrap with details on her forthcoming book about impulse control and the paradox of gaining control by learning when to let go.
