Mark Changizi thinks like an engineer but speaks like a poet of motion. His new book, Motorcycle Mind, begins with the idea that at speed the machine stops being machine: the motorcycle is the mind externalized—a proof that physics and feeling share one grammar. It hums, it leans, it breathes. “It’s alive because we are,” he said. “And for a few seconds on the road, we remember what that means.”
Table of contents
The Physics of Becoming: Countersteering and Embodied Cognition
At the heart of Changizi’s exploration lies a counterintuitive truth about motorcycle physics that revolutionizes our understanding of embodied cognition. When traveling at speed, turning a motorcycle requires countersteering—a phenomenon where riders push the handlebar in the opposite direction of their intended turn.
Studies in embodied cognition show that when riders develop skillful coping with motorcycles, they cease to experience the motorcycle as equipment and instead experience only the goal of movement itself.
“Once you’re up to speed, if you want to turn right, you don’t turn the wheel to the right,” Changizi explains. “You put pressure on the right side—as if you’re turning left. You’re not even rotating it. Just pressure, like you’re signaling a horse.”
This touch-sensitive control emerges from the motorcycle’s complex dynamics and gyroscopic forces at 15-30+ mph. The 600-pound machine responds to the slightest pressure, leaning at 30 degrees without the rider exerting continuous force. This phenomenon demonstrates a radical principle of embodied cognition: the motorcycle becomes an extension of the rider’s body.
The Test of True Embodiment
Changizi offers a compelling thought experiment: “If I have to use my arms to lift my leg after too many squats, that leg isn’t part of my body at that moment. You use body parts to move external objects—turning a faucet, opening a door. But on a motorcycle at speed, you don’t move anything. You apply imperceptible pressure, and the entire machine responds. It’s become part of you.”
Recent neurobiological research confirms that riding a motorcycle enhances sensory focus and increases alertness similar to meditation, with changes in brain activity comparable to drinking coffee.
Emotional Expression Through Machine: The Voice of the Engine
Beyond the physics of control, Changizi reveals another dimension of motorcycle embodiment: emotional expression through manual transmission. Every twist of the throttle, every shift of gears becomes an externalization of the rider’s emotional state.
“Your emotional expressiveness—what you do with gestures and facial expressions—comes out through the sounds of the bike,” Changizi explains. “Because motorcycles are inherently manual transmission, every bike that passes is emotionally evocative. They’re signaling their emotional expressiveness through engine sounds.”
This creates a two-dimensional emotional signaling space identical to human facial expressions. The motorcycle becomes not just a vehicle but a voice—a mechanical extension of the rider’s internal emotional landscape made audible to the world.
The Quadruped Dream: Rediscovering Mammalian Movement
One of the most poetic aspects of Motorcycle Mind is Changizi’s comparison between motorcycle riding and the movement of quadrupeds. Humans, as bipeds, have never experienced the grace and speed of four-legged mammals—until the motorcycle.
“We have fantasies about moving like a wolf or deer,” he notes, referencing mythology from werewolves to the transformation scenes in Altered States. “Your dog’s front two feet act like one wheel, the back two like another. You’re essentially riding a sophisticated two-wheeled system that gives you the exact experience of what it’s like to be a quadruped mammal.”
This isn’t mere metaphor. The motorcycle’s dynamics—the way forces distribute across two contact points, the lean angles required for turns, the speed-dependent stability—mirror the biomechanics of four-legged locomotion. For the first time in evolutionary history, humans can experience this ancestral form of movement.
Color Vision as Empathy Sense: Revolutionary Evolutionary Biology
Shifting from motorcycles to evolutionary neuroscience, Changizi discusses his groundbreaking hypothesis about primate color vision evolution—work that challenges a century of scientific consensus.
The Fruit Detection Myth
For over 100 years, scientists believed primates evolved trichromatic color vision (red-green sensitivity) to better detect fruit. But Changizi identified a fatal flaw: all primates with color vision have the same peculiar cone configuration—two receptors clustered close together in the spectrum, rather than evenly distributed like RGB cameras.
“If fruit detection was the driver, you’d expect massive diversity in color vision across environments with different fruits,” he explains. “Instead, we see invariant color vision across massively diverse environments. That’s the opposite of what the fruit hypothesis predicts.”
The Empath Sense Hypothesis
Changizi’s research demonstrates that primate trichromatic color vision evolved specifically to detect oxygenation changes in hemoglobin visible through bare skin, functioning as an “empath sense” for reading emotions and health states in conspecifics.
The key lies in hemoglobin’s absorption spectrum. When blood oxygenates, a specific spectral region changes from a U-shape to a W-shape. Detecting this transition requires two cone receptors positioned precisely where primate M and L cones are located—not for fruit, but for reading the emotional and physiological states of other primates through their bare skin.
“Color vision is one side of the coin,” Changizi notes. “The other side is nakedness. Primates with red-green color vision have naked faces, rumps, or chests for signaling. Primates without this color vision are furry all over, like typical mammals.”
This hypothesis generates multiple testable predictions:
- Prediction 1: Color vision primates should have bare skin for signaling ✓
- Prediction 2: The cone positioning should optimize hemoglobin oxygenation detection ✓
- Prediction 3: Selection pressure might be stronger for females (maternal infant monitoring) ✓
Indeed, severe color blindness affects 9% of men but virtually 0% of women, suggesting differential evolutionary pressures.
Libertarianism, Cancel Culture, and the COVID Response
The conversation takes an unexpected turn into political philosophy, revealing how scientific thinking intersects with social governance. Changizi, a self-described libertarian, became vocal during COVID after witnessing what he considers betrayals of libertarian principles—including by prominent figures like Nassim Nicholas Taleb.
Bottom-Up Authoritarianism: The Greater Danger
“The most dangerous thing isn’t top-down authoritarianism from centralized government,” Changizi argues. “It’s bottom-up authoritarianism—when your neighbors become snitches, when cancel mobs form on every corner, when middle-aged ladies attack you for exercising outdoors and threaten to report you to the state.”
He draws parallels to living in totalitarian regimes: “This is what it’s like in Iran, China, Nazi Germany. Everywhere around you, people are ready to rat you out and cancel you. Eventually the government follows suit because the populace demands it.”
The Charlie Kirk Tragedy and Cancel Mob Dynamics
The discussion of Charlie Kirk’s assassination reveals Changizi’s nuanced position on cancel culture. While acknowledging the horror of Kirk’s murder and the disturbing celebratory responses from some on the left, Changizi warns against the right adopting cancel mob tactics in response.
“When people say ‘these are terrible people, I don’t want them near medicine or children’—that’s exactly what the left has been saying about us for 30 years. They think we’re literally Hitler, so of course they don’t want us near their patients or students.”
The key distinction: “A cancel mob isn’t free speech. It’s getting someone fired not because the boss thinks they did wrong, but because the boss wants the PR nightmare to stop. This doesn’t defeat arguments—it just makes communities retreat into echo chambers where our social currencies no longer have exchange rates.”
The Incitement Threshold
Changizi advocates for a high but clear threshold for what constitutes actionable incitement: “Just saying ‘yay’ or ‘I’m glad this happened’ is vile speech, but it’s not incitement. Incitement should be a police matter, not a mob matter. We need a high threshold because every side claims self-defense—they argued COVID violations were increasing spread, so censorship was self-defense.”
Cultural Evolution and Membership Signals
From tattoos to gender transitions, Changizi sees recurring patterns of irreversible body modification as political membership signals—a standard human behavior across cultures and eras.
“Trans community members undergo irreversible body modifications as signals of political membership in the progressive club,” he explains. “This isn’t new—it’s the same as neck rings, ear stretching, tribal scarification, biker tattoos, gang markings. The pattern is universal: irreversible modification signals genuine commitment to a socio-political community.”
Crucially, he notes: “They don’t want to pass completely undetected. The point is signaling ‘I was once X, I am now Y, and the irreversibility proves my commitment.’ That’s why the community eventually creates post-hoc justifications—just like other tribes justify why their modifications are actually beneficial.”
The Intersection of Science and Society
What makes Changizi’s work compelling is how seamlessly he moves between rigorous scientific inquiry and broader philosophical questions. His analysis of motorcycle physics illuminates embodied cognition. His evolutionary biology challenges paradigms in sensory science. His political commentary applies scientific thinking to social phenomena.
Throughout, he maintains intellectual honesty: “I don’t have perfect answers about where the incitement line should be—that’s genuinely vague. But clearly there’s lots of actual incitement going unchecked while we’re going after vile speech that isn’t incitement.”
The Books and the Vision
Changizi’s seventh book, Motorcycle Mind, joins an impressive body of work exploring grand unifying theories:
- Vision Revolution: Why we see illusions, have color vision, and read writing that looks like nature
- Expressly Human: Emotional expressions and their evolution
- Previous works on music, language evolution, and perceptual neuroscience
Each book tackles fundamental questions about how cultural artifacts (motorcycles, writing, music) have evolved to interface optimally with our unchanging biological instincts.
“I came out of the academic closet during COVID,” Changizi reflects. “As a libertarian in academia, I was already considered far-right. But I couldn’t keep quiet anymore when even libertarians were screaming for mandates. Now I’m known not just for discoveries but as an academic freedom fighter—not your typical leftist academic type.”
Conclusion: The Grammar of Physics and Feeling
Mark Changizi’s work reveals unexpected connections: between motorcycle dynamics and embodied cognition, between primate skin and color vision evolution, between political membership and body modification, between scientific thinking and social policy.
Motorcycle Mind isn’t just about riding—it’s about how humans and machines can achieve genuine symbiosis, where the boundaries between body and tool dissolve. It’s about rediscovering ancestral forms of movement through modern technology. It’s proof that “physics and feeling share one grammar.”
As Changizi describes the experience: “For a few seconds on the road, we remember what it means to be alive.”
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