Introduction

Marcus stared at his computer in disbelief. The EUR/USD had just broken through what he’d convinced himself was a textbook “double bottom” formation. He has taken a larger position than his normal position, doubling his normal lot size on the back of a feeling of certainty that the pattern signalled a major reversal. Instead, the market moved downwards and then down some more.  triggering his stop-loss and wiping out three weeks of gains.

Despite the belief that the pattern was so clear, what he experienced was not unusual and will be a familiar story to many of us – it was simply his brain doing exactly what it has evolved to do, that is finding patterns, even when none existed (or even if they did there were ither reasons why an apparently textbook entry shouldn’t have been taken.

In simple terms, our mind is naturally programmed to find patterns everywhere, it is how we have survived as a species and how we make sense of the sometimes-complex world around us. This has been the case ever since we have existed. Early hunters who quickly identified the subtle pattern of a predator moving within tall grass lived longer than those who dismissed such signals as random noise

When we look at trading charts, this same instinct kicks in, sometimes making us see meaningful patterns which, on more in-depth examination, could simply be random price movements

Fields like behavioural finance and cognitive psychology have revolutionised our understanding of the interactions between financial markets and traders like you or me, demonstrating that traders often act in predictably irrational ways.

Rather than being the perfectly rational participants in the market we would all like to always be, we are vulnerable to using numerous mental shortcuts and have so-called biases that can distort our perception of market action.

At its foundation principles, behavioural finance recognises and explores why traders often make choices based on emotions, mental shortcuts, and social influences and explains why traders sometimes make decisions that go against their own best interests in the “heat” of the market action.

This article aims to explore this concept in a little more detail and offer some practical suggestions as to how best to manage what may be at the basis of substantial risk to trading results.

The Cognitive Science Behind Pattern Recognition

Pattern recognition is our mind’s ability to identify familiar structures or relationships in information. In trading, this means spotting formations in price charts (like “head and shoulders” or “double top” patterns as obvious examples) that we believe can predict future price movements.

When analysing price movements across any tradable asset, when looking at price movements on a chart, on any timeframe, we automatically search for recognisable structures such as triangles, channels, support and resistance that might produce an expected move in a certain direction for a period subsequently.

Some have suggested that this tendency relates to pareidolia, the same phenomenon that causes us to see faces in clouds or the famous “face on Mars.” Our neural networks are primed to extract signal from noise, sometimes creating connections where none exist.

So, in a trading context, so-called pareidolia might result in us seeing a “bullish pattern” in what’s random market noise.

Neuroscience research suggests that our brains use less energy when processing pattern information than when processing random data, so it is thought that this creates some sort of preference for pattern-based explanations, making us vulnerable to seeing market trends that may be questionable as indicators

Pattern Recognition and Cognitive Biases

A cognitive bias is simple terms, an error in thinking that may alter decisions and judgments, often at the point where we are about to act. These mental shortcuts help us process information quickly, but can commonly lead to serious mistakes in trading, where accuracy often matters more than speed.

Many types of bias have been described, and many of you may have heard “Inner circle” \webinars in the past on this topic. The bottom-line result is invariably a move away from a written trading plan, and rarely does it result in favourable trading outcomes.

For this article, let’s look at four common biases that are relevant to pattern recognition.

1. Confirmation Bias

Confirmation bias is our tendency to more easily notice information that supports what we already believe, and inadvertently ignore information that may contradict our beliefs. In trading, this means paying attention to signals that confirm our market outlook while dismissing evidence that may suggest that perhaps what we are considering has a low probability of being successful.

So, as an example, someone trading an oil futures CFD has an idea that the oil price could rally due to colder-than-expected weather conditions over the next few days. After entering a position, they might focus exclusively on weather reports predicting a continuation of cold levels, ignoring important data that suggested manufacturing activity (and so demand for energy) had come in lower than the market had expected. This “blindsiding” wasn’t because the information wasn’t available, but because it had been filtered it out of the analysis relating to risks associated with taking such a position. This selective attention commonly happens undeliberately and requires a conscious effort to consider information, be it on a chart or news release, outside of what you are immediately focused on.

2. Clustering Illusion

So-called “clustering illusion” happens when we mistake random events for meaningful patterns.

In a trading context, this might be believing that certain days of the week consistently produce market movements in a particular direction, when a more rigorous investigation may suggest that the data doesn’t support this conclusion.

The clustering illusion involves perceiving meaningful patterns in genuinely random sequences. This bias manifests frequently in commodity and cryptocurrency markets, where volatility creates plenty of noise that can be mistaken for a technical signal that may be shaping up to be a change in sentiment.

The danger with this is that even a handful of repeated similar price movements over a few trades may be convincing enough to suggest to the trader that he or she may be “onto something”.

Commonly, when we are in this convinced state, we begin to take action regularly and have been so “duped” that this could be good and even excited about finding something potentially special, that it may take several losses, often heavy, before giving up on this as a trading idea.

With further examination, it may have been identified that the previous “pattern” was merely coincidental clustering in an otherwise random sequence, obscured by our desire for pattern recognition and seeing some order in chaos.

3. Narrative Fallacy

The narrative fallacy is our need to create stories that help us to explain why markets move the way they do. While these stories make us feel like we understand what’s happening, they often oversimplify complex market dynamics and lead us astray.

Humans look for stories that explain often complex phenomena, leading us to create narratives around what are fairly random or low probability price movements.

Generally speaking, we may do this “plant our flag: thinking to explain what may be happening not only as it may feel satisfying but also because this often-misplaced understanding helps us to feel “in control” (and so in a better place to take action) rather than being at the mercy of frequent changes in sentiment.

This preference for stories that make sense rather than more accurate ones based on more robust evidence can result in a succession of disappointing trade decisions.

4. Recency Bias

Recency bias means giving too much importance to recent events when making decisions.

In trading, there are a couple of ways that this is commonly demonstrated.

Firstly, it often leads to chasing trends that have already peaked or have been underway for some time already, and we fear missing out on any further move in the same direction, only to see the price reverse soon after we enter.

Another “symptom” can be that it may result in panicking after a few bad trades, even if your initial strategy has been robust, sound. The pattern of giving more back to the market may lead us to expect the same and exit a position too early when there is no actual technical evidence to do so.

Recency bias can therefore often lead to late entry or early exit, both of which are likely to be detrimental to overall trading outcomes.

The major solution is not only as with all cognitive biases to own that this is what you are doing, but, in this case, take a further look back on previous longer-term trading history, not just the last few trades, to help that

Practical Strategies to Manage Pattern Biases

Fighting cognitive biases all starts with ownership of your trading behaviour. Too commonly, we look to place the blame for poorer results elsewhere, e.g. on markets, where the reason is internal within our distorted thinking at the point of taking trading action. requires creating systems that protect you from your thinking errors. Below are THREE practical approaches that any trader, regardless of experience level, can implement.

1. Creating Trading Rules Before Seeing the Data

These are specific rules you write down BEFORE looking at today’s market action. By deciding in advance what would make you buy or sell, you prevent your brain from “seeing” patterns that may not really be there.

As well as specific, unambiguous written criteria in the form of a formal trading plan, we have talked before about the merits of a “daily agenda” where you re-align with a plan, look at key information resources relevant to the day, and standards of good trading practice. These will all help to put you in the optimum trading decision-making state and so less vulnerable to biases rearing their head during trading action.

2. Maintaining a Trading Journal

A good trading journal records not just what trades you made, but why you made them and how you felt at the time. This helps you spot patterns in your behaviour that might be hurting your results.

We have written before and presented examples of good practice on the potential effectiveness of journaling, including not just what was traded but why. This helps capture your trading mental state and pattern recognition process. Reviewing these notes regularly helps identify recurring psychological traps and, of course, is useful in the management of potential recency bias.

3. Quantitative Validation Techniques

Moving onto a more advanced approach, this means using numbers and statistics, rather than gut feeling, to check if a pattern you think you see regularly really works.

Moving beyond subjective chart interpretation, it is possible to develop more sophisticated ways to verify pattern validity.

Even simple approaches can help such as tracking key metrics such as net profit, maximum drawdown, win rates and average gains/losses for specific patterns, across different strategies, trading direction and chosen markets vehicles can begin reveal which patterns are more likely to deserve your attention and of course those that should be ignored.

Logically, if one accepts this, it may be worth creating code that allows some historical back-testing of your trading strategy ideas. This is possible even on the Metatrader platform strategy tester, even if your aim is not to go down an automated route in terms of confidence in the plan, it could be invaluable. Of course, increased confidence usually results in a decreased likelihood to stray from it and succumb to biases.

In summary

Our pattern-seeking brains served us well not only in ancient times but do so in modern-day living, allowing us to function in a variety of complex situations. However, our inbuilt preference for seeing patterns when explored in the context of financial markets needs some awareness of potential risk and management.

The line between skilled reading of sentiment and succumbing to potential cognitive bias can be very thin, with even experienced traders occasionally falling prey to false patterns that our mind convinces us may be there even if they are not.

Through combining awareness of these psychological risks and putting the right things in place, traders can harness the strength of effective pattern recognition and timely action on a change in market sentiment, while minimising potential pitfalls.

Your brain will naturally find patterns in market data – that is what brains do. Your responsibility as a trader is to recognise and manage this to be able to focus on what really works in your trading.

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