Fathers Lose Testosterone When They Raise Their Kids | Aldrich Chan, Psy.D.

Episode Overview

• The Evolutionary Mismatch of the Modern Mind: Physician Dr. Gabrielle Lyon and neuropsychologist Dr. Aldrich Chan explore how our modern environment clashes with our hunter-gatherer biology, introducing the "SAD Theory" (Separation, Alienation, and Discord) to explain why humans feel disconnected from nature and themselves.
• Brain Networks, Working Memory, and Perception: The discussion breaks down how the Default Mode Network (DMN), Central Executive Network (CEN), and Salience Network govern our attention, why our brains consume massive amounts of internal energy while filtering out true reality, and how cognitive limits like holding only 4 bits of information impact daily decision-making.
• The Neuroscience of Intuition vs. Analysis: Dr. Chan demystifies intuition using empirical research, explaining the "somatic marker hypothesis" and why gut feelings scientifically outcompete logical analysis when navigating complex situations with unknown variables.
• Realigning with the 7 Principles of Nature (CPR WEST): Moving from diagnosis to transformation, the episode details how to apply Creativity, Process, Relationship, Wholeness, Equilibrium, Spontaneity, and Transformation—alongside Daoist philosophy and social neuroscience—to regulate our nervous systems and build resilience.

Key Concepts

• Clinical Attention and Proactive Interference in MCI: In neuropsychology, attention is divided into simple, selective, sustained, alternating, and divided attention. When assessing memory (such as reading a 15-word list to a patient inside a brain scanner), Dr. Chan notes that research from the University of Miami's Center for Cognitive Neuroscience and Aging found "proactive interference"—how old information disrupts the learning of new information—has higher sensitivity and specificity for detecting early-stage Mild Cognitive Impairment (MCI) than a brain scan. (Caveat: Dr. Chan hedges that current medications and practices only help prolong a patient's state rather than cure cognitive decline.)
• The SAD Theory (Separation, Alienation, Discord) & Brain Networks: Dr. Chan's framework explains how humans drifted from nature, beginning with symbolic thought and autobiographical memory (evidenced by cave paintings he states are from "64 to 68 million years ago"). This relies on the Default Mode Network (DMN), which he calls the "MOTS network" (Mental time travel, Others, and The Self), which stabilizes around ages 9 to 12. While the DMN wanders unintentionally 46.9% of the time (Killingsworth and Gilbert, 2010), the Central Executive Network (CEN)—involving the dorsolateral prefrontal cortex and posterior parietal regions—suspends immediate space-time for goal-directed strategy and inhibition.((Dr. Chan hedges that the SAD Theory is not an all-encompassing theory of everything that goes wrong in modern humans, though it relates to many symptoms.)
• Evolutionary Mismatch Theory: Citing Cambridge evolutionary anthropologist Nikhil Chaudhary, proving a mismatch requires three criteria: a difference between modern and hunter-gatherer operations, quantifiable difficulties from that difference, and the absence of those difficulties in traditional hunter-gatherer societies (which Dr. Chan hedges are not identical to pre-10,000 BCE humans, but are our best approximation). Greater than 99% of human history was spent as hunter-gatherers; on a 24-hour clock, the Agricultural Revolution (circa 10,000 BCE) happened in the last 7 minutes, the Industrial Revolution in the last minute, and the digital age in the last 2 seconds. Under these conditions, traits now labeled as deficits—like ADHD—actually provided evolutionary advantages via exploratory thinking and creative outcomes in unpredictable environments.
• Plasticity and the Gut-Brain Axis: Humans adapt to environments via neuroplasticity (brain reorganization) and phenotypic plasticity/epigenetics (where experience modifies gene expression via DNA methylation and histone modification, which can be passed down intergenerationally; Dr. Chan notes research is biased toward trauma/deficits, but hypothesizes positive resilience can also be transmitted). Furthermore, the mind is not confined to the skull: the gut brain has more nerve endings traveling up to the brain than the brain has traveling down to the gut, meaning gut microbiota directly influence mood, cognition, and personality, while cardiovascular issues can cause executive dysfunction.
• Primary Emotional Systems and Motivation: Citing Jaak Panksepp, Dr. Chan highlights "care," "lust," and "play" as primary emotional systems (noting that when fathers care for children, their testosterone and lust-related neurochemicals drop). When pursuing goals, extrinsic motivation relies on external stories in the DMN, whereas intrinsic motivation is visceral and activates the insula (part of the Salience Network, which toggles between the DMN and CEN).
• Working Memory Limits and Temporal Discounting: Without rehearsal, the human brain evolved to hold only about 4 bits of information at once (compared to the classic "7 plus or minus 2" metric, which includes rehearsal). Additionally, humans are wired for "immediate-return" environments and suffer from "temporal discounting"—quantifiably reducing the value of future rewards, which undermines long-term health goals like reversing diabetes or losing weight.
• The Neuroscience of Intuition and Uncertainty: Although Dr. Chan notes science does not fully understand intuition and definitions blur regarding procedural memory (where skill learning shifts from the right to the left hemisphere), he defines it as a non-linear, rapid synthesis of multi-domain brain information resulting in a somatic experience. Antonio Damasio's "somatic marker hypothesis" (using the Iowa Gambling Task) shows the ventromedial prefrontal cortex (vmPFC) activates during uncertain decisions before conscious logic catches up, while the right superior temporal gyrus lights up during "aha" moments. In "first-order uncertainty" (known variables/probabilities), analytical logic beats intuition. In "second-order uncertainty" (unknown variables/probabilities), intuition outcompetes analysis.
• Brain Efficiency and Filtered Reality: The brain contains 100 billion neurons with 10,000 connections each (1,000 trillion connections total, creating more patterns than atoms in the universe). While the Blue Brain Project calculated a supercomputer would need 10 gigawatts of electricity (enough to power 10 to 15 million American homes) to mimic the brain, our actual brain runs on just 20 watts (20% of the body's energy). Citing Marcus Raichle, 60% to 80% of brain energy/information is completely unrelated to perceiving the outside world. Citing Donald Hoffman (who argues we see 0% of true reality, viewing only a survival-oriented desktop interface) and Anil Seth (who showed prediction systems alter visual data at the very first layer of the primary visual cortex, V1), Dr. Chan explains that we construct reality from the inside out.
• The 7 Principles of Nature (CPR WEST) & Flow: Dr. Chan's framework for realignment consists of Creativity, Process, Relationship, Wholeness, Equilibrium, Spontaneity, and Transformation. He illustrates "Process" and uncertainty through the Daoist Huainanzi parable of the Chinese diviner whose runaway horse leads to a chain of events that saves his son from a war where 9 out of 10 recruits died. During creative "flow states" (seen in neuroimaging of improvising jazz pianists, though Dr. Chan notes he forgets the specific author's name), cortical regions quiet down to stop meta-cognitive analysis while subcortical regions become highly active.
• Social Neuroscience, Morality, and Attachment: Humans are wired for connection via mirror neurons (studied by V.S. Ramachandran, where an anesthetized person literally feels their arm being touched simply by watching someone else's arm get touched) and brain synchronization during deep conversation (shown via EEG hyperscanning). Citing David Sloan Wilson's "multi-level selection" (contrasted with Richard Dawkins' "Selfish Gene"), prosocial traits are selected for at the group level. Moral intuitionism appears in 3- and 6-month-old infants (Somerville et al.), who prefer helper toys and stare longer at unequal food distribution, and in rats that pass up chocolate chips and brave threatening open spaces to free a trapped peer. Because only 35% of the human brain is developed at birth (and human infants are not developmentally akin to other newborn animals until age 2), Dr. Chan cites mentor Lou Cozolino's concepts of the "social synapse," "sociostasis," and "survival of the nurtured." In hunter-gatherer tribes like the Hadza, children spend 40% of their time with biological parents and 60% with other villagers ("alloparenting").
• Sponsor & Speaker Disclosures: Dr. Gabrielle Lyon discloses past fellowship training at Washington University (running a memory and aging clinic) and two years of psychiatry training. She reads sponsored segments for OneSkin (OS-01 FACE Topical Supplement with the OS-01 peptide; 15% off with code DRLYON at oneskin.co, noting she used it before they sponsored her), David Protein (Gold David Bar with 28g protein, 150 calories, 0g sugar, 75% calories from protein; 10% off subscriptions at davidprotein.com/DRLYON), and Timeline Mitopure (containing Urolithin A; 20% off at timeline.com/LYON).

Quotes

• At 0:00:00 - "Intelligence doesn't need to be conscious. 60 to 80% of the information that's ongoing in our brains is actually completely unrelated to perceiving the world around us." - Dr. Aldrich Chan citing Marcus Raichle's research on internal brain activity versus external perception.
• At 0:00:12 - "It's about 46.9% of the time that our mind wanders unintentionally." - Dr. Aldrich Chan referencing Killingsworth and Gilbert's 2010 study on the Default Mode Network.
• At 0:00:32 - "It takes some of the mysticism away from intuition if we think about it as this idea and capacity to process complex information that might be outside of our conscious awareness." - Dr. Gabrielle Lyon framing intuition as a grounded neurological mechanism.
• At 0:00:43 - "Lots of people unfortunately cling to their old identities, or they cling onto resentments and they are unable to let go." - Dr. Aldrich Chan explaining how psychological rigidity prevents personal transformation.
• At 0:05:30 - "The variable that we found important was—it's called proactive interference, which is how old information can influence new information that's being learned." - Dr. Aldrich Chan discussing early-stage Mild Cognitive Impairment (MCI) detection at the University of Miami.
• At 0:12:13 - "It's more so the fact that society has changed so drastically from the original conditions that we evolved in, that our nervous system is simply not optimally engaged with the current environment." - Dr. Aldrich Chan reframing conditions like ADHD through evolutionary mismatch theory.
• At 0:22:45 - "If this were a 24-hour timeline, the Agricultural Revolution that happened circa, again, 10,000 BCE, that happened in the last seven minutes. The Industrial Revolution happened in the last minute, and then our digital age is the last two seconds." - Dr. Aldrich Chan illustrating the rapid pace of modern environmental change compared to hunter-gatherer history.
• At 0:27:25 - "The mind cannot be simply the brain. It's just insufficient to explain it all. We know the gut brain, for example, which has become very popularized, has more nerve endings moving up to the brain than the brain does to the gut." - Dr. Aldrich Chan explaining embodied cognition and the gut-brain axis.
• At 0:36:41 - "So, for example, we evolved to have and hold only about four bits of information in our minds at a time." - Dr. Aldrich Chan explaining the biological limits of human working memory without rehearsal.
• At 0:38:47 - "We humans, we suffer from something called temporal discounting, meaning that we discount or reduce the value of events happening in the future, and this is very quantifiable." - Dr. Aldrich Chan describing why humans struggle to stay motivated toward distant goals.
• At 0:48:10 - "It is a non-linear, rapid, complex process that synthesizes information from multiple domains in the brain, leading to a somatic experience of sorts." - Dr. Aldrich Chan providing a neuropsychological definition of intuition.
• At 0:50:53 - "Basically, if a problem is simple and you know all the variables, analysis will beat intuition. If the problem is complex, but you still know all the variables, analysis will beat intuition. If the problem is uncertain, simple or complex, but the variables again are just unknown, intuition will outcompete analysis." - Dr. Aldrich Chan summarizing empirical findings on when to trust gut feelings over logic.
• At 0:53:22 - "100 billion neurons, each neuron has about 10,000 connections. That leads to about a thousand trillion connections throughout the brain, which means that the amount of brain patterns that exist outnumber the amount of atoms in the universe." - Dr. Aldrich Chan illustrating the vast computational complexity of the human brain.
• At 1:09:53 - "The discovery-oriented approach is inhabiting a state of uncertainty intentionally, inhabiting a state of unknowing." - Dr. Aldrich Chan explaining how to navigate second-order uncertainty using curiosity rather than threat detection.
• At 1:29:07 - "One of the things that really struck me was this idea that two people in a relationship were one nervous system. They weren't two." - Dr. Gabrielle Lyon reflecting on the physiological reality of co-regulation and sociostasis.
• At 1:37:01 - "The mere act of labeling the emotion actually results in a limbic response that's reduced." - Dr. Aldrich Chan sharing a practical neuroscientific tool for emotional regulation.
• At 1:45:29 - "In this case of attachment, it's nurture that wins out. It's not survival of the fittest, it's survival of the nurtured." - Dr. Aldrich Chan emphasizing Lou Cozolino's concept of how human infants require deep care to develop properly.

Takeaways

• Cap Your Daily Choices at 4 to 6 Options: Because human working memory only holds about 4 bits of information at once, prevent choice overload and decision fatigue by narrowing options ahead of time—such as pre-selecting 4 movies on Wednesday for a Friday movie night, or standardizing your daily meals and wardrobe.
• Design Immediate-Return Systems for Long-Term Goals: Counteract "temporal discounting" by breaking distant objectives (like weight loss or reversing disease) into immediate, visceral daily rewards and tying them to core personal values, which activates the brain's insula for intrinsic motivation rather than relying on fragile external willpower.
• Match Your Decision-Making Style to the Type of Uncertainty: Use analytical reasoning and lists when all variables and probabilities are known (first-order uncertainty), but consciously shift to somatic intuition and gut feelings when facing complex situations where variables are unknown (second-order uncertainty).
• Adopt a "Discovery-Oriented" Mindset in the Unknown: When confronting unpredictable life events, replace threat-detection and rigid expectations with intentional curiosity—remembering the Daoist parable of the runaway horse to recognize that apparent setbacks may hold unseen future value.
• Label Your Emotions to Quiet the Limbic System: When experiencing intense emotional distress or reactivity, explicitly name and label the specific emotion you are feeling to measurably reduce limbic system activation and regain executive control.
• Reframe Stress as "Eustress" by Assessing Your Resources: Because eustress (beneficial stress) and distress release the exact same physiological chemicals (adrenaline, norepinephrine, cortisol), shift your psychological appraisal during hardships by reminding yourself of the internal and external resources you have to prevail.
• Cultivate Stillness to Unlock True Spontaneity: Distinguish spontaneity from decontextualized impulsivity by practicing meditation or mental stillness; quieting cortical chatter allows your brain to synthesize environmental context and respond fluidly in the moment.
• Leverage "Sociostasis" Through Deep Conversation: Treat your close relationships as a shared nervous system; prioritize deep, meaningful face-to-face conversations to trigger brain synchronization and mirror neuron empathy, actively regulating both your own and your partner's physiology.
• Build an "Alloparenting" Village for Child Rearing: Recognize that human parents did not evolve to raise children in isolated nuclear units; actively seek out trusted community members, extended family, and mentors to share caregiving duties and provide children with diverse social inputs.
• Respond Promptly to Infants Under Two Years Old: Do not worry about "spoiling" babies by responding quickly to their cries; because humans are born with only 35% of their brains developed and remain neurologically premature until age two, consistent nurturing is required to build a secure attachment and healthy nervous system.