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.
- •Studies: telling people they lack free will can increase cheating/unethical choices
- •Free will as an evolved, socially useful illusion
- •Sense of agency encourages responsibility and prosocial behavior
- •Determinism as a tempting excuse (“my brain made me do it”)
- 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.
- •Heather’s background: cognitive neuroscientist and psychologist
- •Big question: neural basis of consciousness (subjective awareness)
- •Unconscious processes drive many decisions and behaviors
- •Humans create narratives that aren’t always the true causes
- 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.
- •Working definition: first-person subjective experience
- •Consciousness doesn’t require language or a strong self-concept
- •Self-report is the core tool for studying conscious awareness
- •We infer consciousness in others/animals via behavior and shared biology
- 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.
- •Evidence approaches: responses to noxious stimuli and anesthesia in animals
- •Hard problem: where to draw the line (fish, insects, fetuses, etc.)
- •Integrated Information Theory: consciousness as integrated, differentiated information
- •Phi as a proposed quantitative index of consciousness
- •Panpsychism implications (even simple systems could have minimal ‘phi’)
- 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.
- •Experiments are grounded in theory but executed pragmatically
- •Psychiatry focus: symptoms (impulsivity/compulsions) mapped to circuitry
- •Clinical research aims to build novel treatments
- •Disorders can reveal how normal cognition works when systems break
- 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.
- •Psychedelics/adjacent compounds: MDMA for PTSD, ketamine for depression, psilocybin for anxiety/depression
- •Contrast with incremental SSRI-era progress
- •Renewed optimism: potential paradigm shift in psychiatry
- •Importance of evidence-based clinical protocols
- 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.
- •Different drugs, different mechanisms; still early-stage science
- •Psychedelics can reduce activity tied to ego/self-focus
- •Potential to interrupt rumination and depressive thought loops
- •Increased long-range network communication and novel activation patterns
- •Therapeutic impact may rely heavily on the psychological experience, not just pharmacology
- 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.
- •Long-term potentiation vs rapid, high-impact ‘one-trial’ learning
- •Evolutionary example: avoiding a poisonous berry after one illness
- •Psychedelic sessions as intense experiences that reframe meaning
- •New perspectives can gradually sculpt new long-term patterns
- 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.
- •PTSD involves protective suppression that still drives symptoms
- •MDMA can enable calm, safe re-engagement with traumatic memories
- •Memory reconsolidation: re-associating trauma with neutral/less-negative affect
- •Guided psychotherapy is crucial; the drug alone isn’t the treatment
- 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.
- •Visual processing streams: color, motion, features can be dissociated by lesions
- •Conscious perception requires feedback/recurrent processing, not just early sensory activation
- •Imagination activates similar visual regions as actual seeing
- •Metacognitive tagging distinguishes internal vs external sources
- •Schizophrenia/hallucinogens can disrupt source monitoring, making inner events feel external
- 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.
- •Brain is always active; thoughts ‘pop up’ without conscious initiation
- •Suppression paradox: trying not to think increases salience
- •OCD model: obsession → anxiety → compulsion; treat by preventing the compulsion
- •Habituation: sitting with anxiety reduces the cycle over time
- •Meditation: observe thoughts without emotional reaction; ‘move into’ fear/anxiety
- 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.
- •Libet experiments: readiness potential precedes conscious intention
- •Modern decoding can predict choices seconds before awareness
- •“You are your brain”—consciousness may be the last to know
- •Self-control as an evolved capacity (prefrontal cortex as brake)
- •Biological constraints: therapy can shift traits but within limits
- •Belief in free will can reduce unethical behavior; undermining it can backfire
- 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.
- •Self isn’t located in one place; it’s an emergent, distributed construct
- •Continuity relies heavily on memory; amnesia can erode identity
- •Neuroplasticity: you’re a ‘work in progress’ across the lifespan
- •Ego dissolution can reduce self-focused worry and feel connecting/therapeutic
- •Human foresight enables planning but also uniquely supports anxiety/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.
- •Meaningful stance: seek the fullest range of conscious experience
- •Human cognition’s costs and benefits: depth, anxiety, and insight
- •Book: focused on impulse control and the ‘controlled letting go’ paradox
- •Where to find Heather online and final sign-off
