The Hour Between Dog and Wolf
When hormones drive our choices
Description
Somewhere on a Wall Street trading floor in the late 1990s, a young man is watching a screen and feeling something he has no word for. His pulse has quickened. His attention has narrowed to a single point. His hands are warm, his sense of time has bent, and he is about to put on a position larger than he can strictly justify — and he is sure, with a conviction that has nothing to do with the numbers, that he is right. His name is John Coates, he runs a desk trading derivatives, and years later he will go back to Cambridge and spend a career trying to explain what happened to his body in that moment.
Coates had trained as an economist and then, oddly, retrained as a neuroscientist, because the standard economic story kept failing the evidence in front of him. That story says a trader is a mind: a cool calculator weighing probabilities, occasionally derailed by emotion the way a computer is derailed by a virus. What Coates had watched on the floor looked nothing like that. He had seen traders on hot streaks turn reckless, seen steady colleagues freeze during a crash, seen the whole room move as one animal. The body, it seemed, was not interfering with the trading. The body was doing the trading.
The title comes from an old French phrase, l'heure entre chien et loup — dusk, the hour when the light fails and you can no longer tell the familiar dog from the wolf, when the tame slides into the wild. Coates borrows it for the moment when a rational professional stops being quite so rational, when older, chemical instincts take the wheel. It is a strange claim to make about the most numbers-driven business on earth. It is also, he argues, exactly where the money is made and lost.
The question we’re asking : How much of a financial decision is made by the mind, and how much by the chemistry moving through the body that holds it?What we’ll see : How a neuroscientist who used to trade tracked two hormones through booms and busts, and what they do to the people betting other people's money.
Table of contents
01Chapter 1 — The trader who felt his body change
Before Coates had any of the science, he had the sensation. Trading, he noticed, was intensely physical in a way nobody talked about. A trader waiting for an economic number to drop would go quiet, breathing shallow, muscles loaded like a sprinter in the blocks. When the number came and the market lurched, the reaction was faster than thought — the hand had already hit the button before the reasoning caught up. This was not decoration around the decision. It was the decision, arriving through the body first and the explanation second.
What pushed Coates from the desk back to the lab was the dot-com bubble around 1999 and 2000, which he watched from the inside. He saw ordinarily cautious men transformed. They became euphoric, sleepless, convinced of their own genius, taking positions that a year earlier they would have laughed at. Then the market turned and the same men collapsed into a fear so total they could not act at all. The mood swings were too uniform, too synchronised across the floor, to be personality. Something biological was sweeping through the room, and it seemed to track the market itself.
02Chapter 2 — Testosterone, and the winner who keeps winning
The first hormone was testosterone, and here Coates leant on decades of animal research summed up in what biologists call the winner effect. In many species, an animal that wins a fight sees its testosterone rise, and that elevated testosterone makes it more likely to win the next fight — more confident, more energetic, quicker to take risks. Win a few in a row and the animal becomes formidable. But the loop does not stop at optimal. Push it far enough and the winner grows over-confident, starts fights it cannot win, ventures into open ground where predators wait. The very chemistry that built the streak eventually gets the animal killed.
Coates suspected traders were running the same loop with numbers instead of antlers. His floor data pointed that way: on mornings when a trader's testosterone was already elevated, he tended to have a more profitable afternoon, as if higher hormone levels were priming him to take the kind of risk the market happened to be rewarding. And a good day fed the next day, testosterone rising on the back of wins. For a while this is wonderful. A confident trader in a rising market makes money, which makes him more confident, which makes him take bigger bets, which — while the trend holds — makes more money.
03Chapter 3 — Cortisol, and the market that will not stop
Then the market turns, and the second hormone takes over: cortisol, the body's stress signal. Cortisol is not the villain of the story — in short bursts it is exactly what you want. It mobilises energy, sharpens focus, prepares the body to handle a threat and then recede once the threat passes. A trader hit by a sudden loss gets a jolt of cortisol, snaps to attention, deals with it. That is the system working as designed, the way a sprint of fear works when a car swerves toward you.
The problem is what happens when the threat does not pass. In a crash, uncertainty does not spike and resolve; it grinds on for days, weeks, months. Coates found in his floor study that cortisol tracked not so much losses themselves as uncertainty — the swings, the volatility, the not-knowing. And when he moved the question into the controlled setting of the lab, dosing volunteers so their cortisol stayed elevated over time, the effect on their behaviour was striking. Sustained high cortisol made people more risk-averse, more pessimistic, more prone to see danger everywhere. The body, flooded with stress chemistry, was quietly rewiring their appetite for risk.
04Chapter 4 — The mind was never just the brain
Underneath the trading floor, Coates is picking a fight with a much older idea: the Cartesian split that treats mind and body as separate things, the mind doing the reasoning and the body merely carrying it around. Economics inherited this split wholesale. Its model of a decision-maker is a disembodied calculator of probabilities, and emotion, when it appears at all, is noise — a bug to be corrected. Coates's whole argument is that this creature does not exist. There is no thinking that happens apart from a body that is hungry, tired, aroused, or afraid, and the signals flowing up from that body are not interference with the decision. They are part of it.
He draws on the idea, associated with the neuroscientist Antonio Damasio, that we think with our bodies — that gut feelings are real physical signals the brain reads to make fast judgements, and that a person cut off from those signals does not become more rational but simply cannot decide at all. Coates extends this from the individual to the market. A price chart, in his telling, is not just a record of information being processed. It is also a record of thousands of bodies flooding with testosterone and cortisol, in rough synchrony, amplifying each other's chemistry until the swing becomes self-feeding.
05Conclusion
Coates closes where he began, back with the trader watching a screen and feeling his body take over. The difference is that the sensation now has an anatomy. That warmth in the hands, that bending of time, that groundless certainty — these are testosterone and cortisol and adrenaline doing ancient work, preparing a body for a challenge it thinks is physical. The trader was never simply reasoning about prices. He was a mammal responding to threat and reward with the only equipment evolution gave him, in a place that equipment was never designed for.
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