What MIT Researchers Found About
Emotions in Trading

The MIT Study That Questions Everything

Andrew Lo, professor at the Massachusetts Institute of Technology (MIT) and director of the Laboratory for Financial Engineering, is one of the most influential researchers in the field of Behavioral Finance. His work on emotions and trading decisions has fundamentally changed our understanding of what makes a good trader.

Lo and his team studied the physiological and emotional reactions of traders while they made real trading decisions. They measured skin conductance, heart rate, and other biometric data – and compared them with trading results.

The four key findings contradict almost everything the trading industry has been preaching for decades.

Finding 1: There Is No Trader Gene

The trading industry loves the idea of the "born trader" – someone who naturally stays cool, shows no emotions, and instinctively makes the right decisions. Andrew Lo proved: This concept is a myth.

His research showed that there are no personality traits that reliably predict whether someone will become a successful trader. Different personality types – introverted or extroverted, analytical or intuitive, risk-seeking or cautious – could all achieve equally good results.

The decisive factor was not who you are, but how you handle your emotions. Not the absence of emotions, but the management of emotions separated successful from unsuccessful traders.

Finding 2: Emotions Are Unavoidable – But Manageable

Perhaps the most important finding from the MIT studies: Every trader has emotional reactions. Every single one. Without exception. Even the most profitable ones.

The biometric measurements showed that even experienced, successful traders had measurable stress reactions during losses and euphoria during gains. Their pulse rose, their skin conductance changed, their bodies reacted.

The difference: Successful traders had learned to recognize these emotions and still trade according to their rules. They didn't suppress their emotions – they used them as an information source. When they noticed their fear rising, that was a signal to pause, not to act impulsively.

Less successful traders, on the other hand, let their emotions flow directly into actions: Fear led to early profit-taking, pain to revenge trading, euphoria to overtrading.

Finding 3: Morning Losses Poison the Entire Day

Andrew Lo's research confirmed and expanded upon the findings of Coval & Shumway (CBOT study). Traders who suffered losses in the morning showed altered emotional and physiological patterns for the entire remaining trading day.

Specifically, this meant:

• Elevated stress levels – measurable via skin conductance and heart rate
• Faster decisions – less analysis, more impulse
• Larger position sizes – the attempt to recover losses
• More trades – overtrading as a reaction to emotional pain

The finding is clear: A bad morning doesn't just affect your mood – it measurably changes your behavior for the rest of the day. Without a system that alerts you, you don't even notice.

Finding 4: Self-Perception vs. Reality

One of the most uncomfortable findings from Lo's research concerns the gap between self-perception and actual behavior.

Traders were asked how emotional they are during trading. Most rated themselves as relatively rational and controlled. The biometric data showed the opposite: Their physical reactions were often intense – even when they subjectively believed they were acting calmly and deliberately.

What this means: You can't trust your own assessment. Your brain is excellent at rationalizing emotional reactions. You move the stop-loss and think "That's an analytical decision." In reality, it's loss aversion. You make the next trade and think "Good opportunity." In reality, it's revenge trading.

Behavioral Finance: The Bigger Picture

Andrew Lo's research is part of a larger field of study: Behavioral Finance. This field systematically investigates how psychological factors influence financial decisions.

What This Means for Your Trading

The MIT research provides three clear action items:

First: Stop searching for the perfect mindset. There is no trader gene and no personality type that automatically trades better. What matters is your system for managing emotions.

Second: Don't trust your self-assessment. Research shows a massive gap between what traders believe they feel and what they actually feel. You need objective data about your behavior – not your gut feeling.

Third: Install an early warning system. If morning losses can poison your entire trading day, you need a tool that warns you before the damage is done. Not after.

FAQ – Emotions in Trading

Can you trade without emotions?

No. Andrew Lo's MIT study proves that every trader – including professionals – has measurable emotional reactions. The question is not whether you have emotions, but how you handle them. Successful traders don't suppress their emotions; they use them as an information source and still trade according to their rules.

Is there an ideal personality type for trading?

No. MIT research clearly shows that there is no innate trader gene. Different personality types – introverted, extroverted, analytical, intuitive – can all achieve equally good results. The decisive factor is not personality, but the ability to self-reflect and a structured system for managing emotions.

How do I know if emotions are affecting my trading?

The biggest challenge is the gap between self-perception and reality. Lo's research shows that traders systematically underestimate their own emotionality. The best approach: Document every trade including your emotional state, and use an AI-powered journal like FlowTrader AI that objectively detects behavioral patterns – independent of your subjective assessment.