Transcription
You are going to have approximately 70,000 thoughts today. 70,000. And of those 70,000 thoughts, research suggests that somewhere between 60 and 80% will be negative. Thoughts about what could go wrong. Thoughts about what you should have said, thoughts about the future you are afraid of, and the past you cannot change, and the version of yourself that you suspect is not quite good enough.
And of those negative thoughts, approximately 90% will be exact repetitions of thoughts you had yesterday. The same thoughts recycling through the same neural pathways, producing the same feelings, pulling your attention in the same directions with the same predictability and the same cost. You are, in other words, not thinking your thoughts. Your thoughts are thinking you.
And the question I want to spend the next 40 minutes answering is the most practical question I know. What does the science actually say about whether you can change this? Not whether you can suppress thoughts. The science is very clear that suppression does not work and in fact makes things worse. Not whether you can think positively. The science is equally clear that forced positive thinking is largely ineffective and occasionally harmful. But whether there is a genuine evidence-based, mechanistically understood approach to changing the relationship between you and your thoughts, to developing, in a real rather than a metaphorical sense, some meaningful degree of influence over what your mind does and where your attention goes.
The answer is yes. And Richard Feynman, who never wrote about neuroscience and never gave a lecture on cognitive psychology, understood the essential principle of that answer more clearly and more practically than most people who have spent their careers studying the mind. Because what Feynman understood from physics, from his own experience of learning and thinking and living, was that the relationship between a mind and its contents is not passive. That thought is not something that simply happens to you. That attention is not simply allocated by forces outside your control. And that the specific habits of mind he built over his lifetime, for reasons that had nothing to do with managing his psychology, turned out to be among the most effective practices for cognitive self-regulation that the science has ever identified.
Let me start with the neuroscience because the neuroscience is genuinely fascinating and I think it changes everything about how you relate to the problem. There is a network in the brain called the default mode network. It was discovered relatively recently. The early identification of it as a coherent system was published by Marcus Raichle at Washington University in 2001, and its discovery was somewhat accidental. Neuroscientists were doing brain imaging studies and they noticed that when subjects were resting between tasks, not doing anything in particular, certain brain regions became consistently more active rather than less. The brain, when given nothing external to focus on, did not go quiet. It became more active in a specific, consistent, coordinated pattern of regions that had not previously been recognized as a system.
That pattern of activity, the default mode network, is what your brain does when it is left to its own devices. And what it does, it turns out, is tell stories. It generates narratives about the self. It simulates past events, replaying and reanalyzing what happened. It simulates future events, projecting forward into scenarios that may or may not occur. It processes social information, thinking about other people and their thoughts and their judgments. It generates the continuous internal monologue that most people experience as their stream of consciousness. The default mode network is, in the most literal neurological sense, the machinery of the wandering mind.
And here is the finding that I think should stop everyone in their tracks. Research by Matthew Killingsworth and Daniel Gilbert at Harvard, published in Science in 2010, used an experience sampling method to track people's thoughts and happiness levels throughout their days. They contacted people at random moments and asked, "What are you doing? Are you thinking about what you are doing? And how happy are you right now?" And the finding was stark and consistent and has been replicated many times since. A wandering mind is an unhappy mind. Not sometimes, not in certain circumstances. Consistently, reliably, across activities, across demographics, across cultures, the more time people spent thinking about something other than what they were currently doing, the more active their default mode network, the more their minds were generating self-referential narrative rather than engaging with the present, the less happy they reported being. Not because the content of the wandering thoughts was necessarily negative, though often it was, but because the wandering itself, the disconnection from present experience, the absorption in self-generated simulation, was associated with reduced well-being independent of what was being simulated. The wandering mind, as the researchers put it, is a cost that the brain pays for its remarkable capacity to think about things that are not happening right now.
This is the baseline. This is what 70,000 thoughts a day looks like at the neurological level. The default mode network running its default programs, generating its default narratives, pulling attention away from the present and into the self-referential simulation that is its primary function. And the question is, what if anything, can you do about it?
The answer begins with a distinction that Feynman would have appreciated immediately because it is the same distinction he made about everything. The distinction between trying to control the output and understanding the mechanism, between trying to manage the thoughts and changing the conditions under which the thoughts arise. Most attempts at thought control focus on the output. They try to stop or suppress or replace specific thoughts. "Do not think about the presentation you are anxious about." "Think positively instead of negatively." "Replace the self-critical thought with an affirming one." And the research on these approaches is, with some nuance, not encouraging.
The most famous demonstration of suppression failure is the white bear experiment by Daniel Wegner at Harvard. He told subjects not to think about a white bear, and they thought about it more, not less. Because the act of trying not to think about something requires holding the thing in mind as the target of the suppression. The suppression system needs to know what it is suppressing in order to suppress it. And in holding the target in mind, it activates the very thing it is trying to deactivate. This is not an obscure laboratory finding. It is the daily experience of anyone who has ever been told to calm down, who has ever tried to stop worrying, who has ever attempted to sleep by trying not to think about the thing that is keeping them awake. The harder you try to suppress a thought, the more present it becomes.
So if suppression does not work, what does? The answer that the neuroscience now points to most consistently is not control of thoughts, but influence over the conditions that generate them. Not managing the output of the default mode network, but changing the input conditions that determine what the network generates. And this is precisely where Feynman's way of living and thinking becomes directly practically relevant.
Feynman had a practice that he described in various ways at various points in his life, but that always had the same essential structure. He kept his mind actively engaged with genuine questions. Not performatively engaged, not busy for the sake of business, but genuinely, curiously, substantively occupied with problems that actually interested him. He carried a list of open questions, things he wanted to understand, problems he had not solved, phenomena that puzzled him, and he returned to these questions regularly, not because he was trying to manage his mental state, but because the questions genuinely fascinated him. The engagement was intrinsically motivated.
And what this practice did to his mental life, what he described and what the neuroscience explains, is that it consistently displaced the default mode network activity with something else: with directed, purposeful, externally focused thought. Because the default mode network and the task-positive network, the network that activates during focused, goal-directed engagement with external problems, are in a relationship of mutual suppression. When one is active, the other tends to be quiet. When you are genuinely engaged with a fascinating problem, the self-referential narrative generation of the default mode network steps back. The rumination quiets. The anxiety about the future and the replaying of the past become less accessible. Not because you are trying to suppress them, but because the attention is fully occupied elsewhere.
This is one of the most important findings in cognitive neuroscience for the practical question of mental well-being. And it is almost completely absent from popular discussions of thought control, which tend to focus on mindfulness and suppression and positive thinking, while missing the most powerful lever of all. Genuine engagement with things that are actually interesting is one of the most effective interventions for reducing the default mode activity that produces rumination, anxiety, and the cycling negative thoughts that most people spend enormous energy trying to manage. Feynman was not practicing thought control. He was practicing something that incidentally produced excellent thought control as a byproduct of being genuinely absorbed in the world. And that distinction matters because the deliberate attempt to control thoughts often makes them worse, while the practice of genuine engagement makes them better without the effortful self-monitoring that suppression requires.
Let me give you a specific story about Feynman and his own mind that illustrates this more concretely than any abstract description can. After the Manhattan Project, after Arlene's death, Feynman was at Cornell in the state of burnout and grief and creative emptiness that I have described before. And what he noticed in those months when the physics had gone quiet was that his mind was loud in a way it had never been before. The thoughts that had always been present but manageable: the self-doubt, the anxiety about whether he was done, the grief about Arlene, the complicated feelings about the bomb, became overwhelming when the engagement with physics that had always occupied his attention was no longer available. The default mode network, deprived of the competition it had always faced from Feynman's consuming intellectual engagement, ran unchecked, and it was not pleasant.
And the thing that rescued him was not a psychological intervention. It was a plate. A wobbling plate in a cafeteria. A problem that was interesting for no reason except that it was interesting. And the moment his attention was captured by that wobble, the moment genuine curiosity re-engaged and directed his attention towards something external and fascinating, the internal noise quieted, not because he was trying to quiet it, because the attention had somewhere better to go. He described the feeling as a cork being pulled from a bottle, everything flowing out freely, effortlessly, with a quality of ease that had been completely absent during the months of struggling and silence. And the ease was not the ease of the problems being simple. The problems were, if anything, harder than they had been before. The ease was the ease of genuine engagement, of the mind doing what it is best at in the conditions that allow it to do that best: absorbed in something real, occupied with something fascinating, fully present with a problem that has the complete weight of genuine curiosity behind it.
This is what the neuroscience of flow states, documented extensively by Mihaly Csikszentmihalyi at Claremont Graduate University, tells us about optimal experience. Flow, the state of complete absorption in a challenging, intrinsically rewarding activity, is associated with reduced activity in the self-referential processing regions of the brain. The inner critic quiets in flow, not because it has been suppressed, but because the attention has no resources left to allocate to it. The task is consuming everything. And what is left when the self-referential processing quiets is the experience that people across cultures consistently describe as the best moments of their lives: fully present, fully engaged, fully alive in the doing of the thing. With no mental bandwidth left for the default mode network's relentless generation of past and future and self-critical narrative.
Feynman spent more time in flow than almost any person I have ever read about. Not because he was neurologically exceptional, though he was intellectually extraordinary, but because he had constructed a life and a set of practices that consistently created the conditions for flow: genuine challenges at the edge of his ability, intrinsic motivation rather than external pressure, clear goals and immediate feedback, the protection of uninterrupted time. These are exactly the conditions that Csikszentmihalyi identified as the prerequisites for flow, and Feynman had built all of them into the structure of his daily life, not as a psychological strategy, but as the natural expression of his commitment to the work.
Now let me talk about the second major mechanism because flow and genuine engagement are powerful, but they are not the complete answer. Because there are thoughts that intrude even into engagement. There are forms of cognitive noise that are not simply displaced by absorption in interesting problems. And for these, the science points to something different, something that Feynman also embodied, though again, not as a deliberate psychological practice. The mechanism is what neuroscientists and psychologists now call metacognition: thinking about thinking, the ability to observe your own cognitive processes. To notice that a thought is occurring. To recognize its character and its pattern. To relate to it as an observer rather than as a participant, without immediately being swept up in its content or acting on its emotional charge.
This is the essential mechanism of mindfulness practice, though it predates the modern mindfulness movement by millennia. The Stoic philosophers built an entire ethical and psychological system around the distinction between events and our judgments about events. The distinction between what happens and the story the mind tells about what happens. Epictetus said, "People are disturbed not by things, but by the opinions about things." Marcus Aurelius wrote repeatedly about the practice of observing his own reactions and recognizing them as reactions, as events in the mind, rather than as objective truths about the situation.
The neuroscience has now given us a mechanistic account of why this works. When you observe a thought, when you step back from its content and label it, when you say to yourself, "This is an anxious thought," rather than being flooded by the anxiety, you activate the prefrontal cortex, the brain's executive control system. And the activation of the prefrontal cortex is associated with reduced activity in the amygdala, the brain structure most closely associated with fear and threat responses, and the emotional charge that makes unwanted thoughts so difficult to manage. The act of observation, of metacognitive labeling, literally changes the brain activity pattern associated with the thought, reducing its emotional power without suppressing its content. This is why the instruction to "not feel anxious" never works, while the practice of "noticing that you are feeling anxious" often does. The first is directed at the output. The second is directed at the relationship with the output. The first activates the suppression mechanism and makes the anxiety more present. The second activates the observation mechanism and reduces the anxiety's grip.
Feynman had an unusually well-developed metacognitive capacity, though he would never have used that word. He described it as noticing what his mind was doing. He talked about noticing when he was fooling himself, the specific alert self-awareness of catching his own motivated reasoning in the act. He talked about noticing when the physics was going badly, not because the physics was hard, but because he had started doing it for the wrong reasons: for prestige, for reputation, for something other than genuine curiosity, and feeling the difference between those states from the inside. He was, in short, a careful observer of his own cognitive processes. Not anxiously self-monitoring, not trapped in self-analysis, but genuinely curious about how his own mind worked, the same way he was curious about how everything else worked. This curiosity about the mind from the inside is, I think, one of the most underappreciated aspects of Feynman's intellectual life. He treated his own cognition as a phenomenon to be understood, not just a tool to be used. He was interested in what he was doing when he was thinking, how intuitions formed, how insights arrived, what the difference felt like between genuine understanding and borrowed vocabulary from the inside. And that interest, that ongoing, curious, non-judgmental attention to his own mental processes, is a form of metacognitive practice that the research suggests is one of the most powerful tools available for the development of genuine cognitive self-regulation.
Now let me put this together into something practical because the science is interesting, but what you want is to know what to actually do. What specific practices derived from the neuroscience and from Feynman's example will make the most difference to the quality of your thinking and your experience of your own mind?
The first practice is the one that follows directly from the default mode network research, and it is this: Build a list of genuine questions. Not tasks, not goals, not things you should think about, but questions that genuinely interest you, problems in your field that you have not solved, phenomena in the world that you do not fully understand, ideas at the edge of your current knowledge that pull at you with genuine curiosity. Carry this list. Return to it. Let it be the thing your mind goes to in the idle moments, the commute, the walk, the minutes before sleep, when the default mode network would otherwise fill the space with rumination and recycled anxiety. The research on this is indirect but compelling. The studies on curiosity and well-being consistently show that curious people report higher levels of life satisfaction, lower levels of anxiety, and greater resilience in the face of adversity. Not because curiosity suppresses negative experience, but because it provides genuine competition for the attention that would otherwise be consumed by it. The curious mind is a mind that is often somewhere interesting. And a mind that is often somewhere interesting is a mind with less available bandwidth for the rumination and self-criticism that consumes so much of the attention of the average day.
The second practice is directed attention training. This is not meditation in the full sense, though meditation is one form of it. It is the deliberate, regular practice of choosing where your attention goes and returning it there when it wanders. Reading a difficult book without your phone nearby and noticing when your attention drifts and returning it to the page. Working on a single problem without interruption and noticing the pull toward distraction and choosing to stay. Walking without earphones and letting the mind be present with the walk rather than filling the space with input. The research on sustained attention training is clear and consistent. The capacity for focused attention strengthens with practice in exactly the same way a physical skill strengthens with practice. The neural circuits supporting sustained focus, the circuits in the prefrontal cortex that maintain attention against distraction, develop with use. And a prefrontal cortex that has been trained through regular directed attention practice is a prefrontal cortex that is better at all of the metacognitive functions I described earlier: better at noticing thoughts without being captured by them, better at labeling emotional responses and reducing their charge, better at maintaining the observer relationship with mental content that is the foundation of genuine cognitive self-regulation. Feynman trained his directed attention constantly, not through meditation, but through the sustained, deep, uninterrupted engagement with physics that was the center of his life. Every hour he spent with a difficult problem, resisting the pull of distraction, staying in the productive discomfort of not yet knowing. Every one of those hours was directed attention training. The strength of his focus, the depth of his engagement, the quality of his cognitive self-regulation. These were not gifts. They were the cumulative result of a lifetime of practice in exactly the skill the practice was building.
The third practice is the most specifically Feynman-derived, and it is the one I want to leave you with because I think it is the most practically transformative. It is the practice of treating your own thoughts as phenomena to be understood rather than truths to be believed or threats to be managed. When a thought arrives, particularly an unwanted one, a self-critical one, a catastrophizing one, a recycled worry, Feynman would have asked, "What is this? What is actually happening here?" Not in a therapeutic, self-examining sense. In a genuinely curious, genuinely scientific sense. What is the structure of this thought? What is it claiming? What evidence would I need to evaluate that claim? Is this a pattern? Have I had this thought before? What triggers it? What does it actually tell me about the situation versus what does it tell me about the state of my mind right now? This is metacognition operationalized as scientific inquiry. It applies the same first-principles curiosity that Feynman brought to physics: the refusal to take the label at face value, the insistence on understanding the mechanism, to the contents of one's own mind. And what it produces is exactly what the neuroscience predicts. The thought becomes an object of observation rather than an experience you are inside. The prefrontal cortex engages. The amygdala quiets. The emotional charge reduces. And the thought, stripped of its charge, can be evaluated on its actual merits rather than its felt urgency.
You are not your thoughts. This is not a motivational statement. It is a neurological fact. The thoughts are events in the brain. They are generated by networks that are doing their best to model the world and the self and the future. They are imperfect models, biased by history and conditioned by environment and shaped by everything that has happened to you. They are worth listening to sometimes, when they are carrying genuine information. They are not worth obeying automatically, because automatic obedience to the output of a biased, history-conditioned, default mode network-generated narrative is not wisdom. It is just noise running on repeat.
Feynman knew this not from neuroscience. The neuroscience did not exist yet in the form I have described. He knew it from physics, from the deep, practiced, lifelong habit of asking, "What is actually happening here?" rather than accepting the first available description. From the refusal to mistake the map for the territory that his father had planted in him as a child, and that he had applied to everything, including, eventually, to the workings of his own remarkable mind.
70,000 thoughts today, 60 to 80% negative, 90% repeating. You did not choose most of them. You do not have to believe any of them. And the science tells you with increasing precision and confidence that the path to genuine influence over your own mental life runs not through suppression or forced positivity, but through engagement and observation. Through filling the space with genuine curiosity, through training the attention that the curiosity requires. Through relating to your thoughts the way Feynman related to every phenomenon he encountered: with interest, with rigor, with the foundational assumption that understanding what is actually happening is always better than accepting the first available story about it. Your mind is the most interesting thing you will ever study. Start studying it.
If this opens something up for you tonight, if you are going to approach your own mind a little differently tomorrow, then like this video and subscribe to Mind of Richard Feynman. We take Feynman's way of seeing the world and apply it to everything that matters, including the world inside your own.