Cognitive Biases in Gambling: How Your Brain Tricks You

What Are Cognitive Biases?

Cognitive biases, also known as heuristics, are mental shortcuts we make based on what we’ve learned from past experiences.

Back in caveman times, our brains started evolving to recognise patterns. Dark clouds mean it’s likely to rain, and bright sun means you should probably invent suncream ASAP. Understanding what triggers certain events meant we could prepare for their outcomes and protect ourselves as best as we could.

Unfortunately, this survival mechanism backfires catastrophically in modern casinos. The same neural pathways that stopped us eating poisonous berries now encourage us to think a slot machine’s bright lights mean we’re winning, and convince us that we almost won when, in reality, we didn’t. The human brain doesn’t like randomness, so it’ll try to rationalise it with patterns that, sometimes, aren’t there at all.

First, before we dive in: while you should avoid being led by them, cognitive biases are in no way a sign of low intelligence. Experiencing these thought patterns is like being able to select all of the pictures with bicycles — it’s proof you’re human. Still, knowledge is power; being aware of how your brain works will help you stay sharp in casinos, and guide you to make decisions that keep gambling safe, responsible and fun.

Types Of Cognitive Biases

Different types of cognitive bias draw on different memories, vulnerabilities and tendencies, and result in a range of behaviours. Here are the main ones you should be aware of when you’re in a casino:

The Bias	What Your Brain Thinks	Casino Example	Real-World Equivalent
🎲 Gambler’s Fallacy	The misled assumption that the outcome of past events affects what will happen in the future	Betting red because black hit five times	Assuming it’ll be sunny tomorrow because it has rained all week
🕹️ Illusion of Control	The belief that you have the power to influence events with random outcomes	Rolling the dice gently to increase your chance of getting a certain number	Pressing the pedestrian crossing button multiple times so that the lights change faster
🤏 Near-Miss Effect	Seeing an ‘almost-win’ as anything but a loss	Thinking you nearly won a scratchcard because you only needed one more jackpot symbol	Missing your train by a minute, and thinking you’ll still be earlier than someone who missed the train by half an hour
🧠 Recall Bias	Remembering big wins vividly, which clouds the negative memories of losses	Choosing a slot you won a jackpot on a few months ago, even though you’ve made a net loss on it overall	Going back to your favourite park years later, forgetting that it has been turned into a multi-storey car park
😎 Overconfidence	Believing that your intuition, luck or skill give you the edge on statistical odds	Playing low-RTP progressive slots because you’ve got an unshakeable feeling you’ll win the jackpot	Believing a restaurant’s bad reviews won’t apply to your dinner and leaving with possible food poisoning
💸 The Sunk Cost Fallacy	Trying to make up for losses by putting more money into the same game, because otherwise the losses would have been for nothing	Putting more money into a slot to recoup everything you’ve lost	Going to the cinema to see films you don't enjoy because you already paid for a season pass

💡 The Gambler’s Fallacy is also known as the Monte Carlo fallacy. In 1913, a roulette dealer in a Monte Carlo casino landed 26 consecutive blacks. The longer time went on, the more people thought the ball was ‘due’ to land on red. In reality, since each throw is an independent event, the likelihood of red hitting was the exact same every time.

How Casinos Take Advantage

Putting faith in your own decision-making over the concept of chance is an exhilarating idea for many, and the house knows it.

Casinos are aware of cognitive biases, and use them to trigger specific types of thoughts and responses. Here are a few tactics to look out for:

Losses Disguised as Wins (LDWs)

Ring ring, it’s the National Lottery! We’re calling to congratulate you on your ginormous, unbelievable, life-changing win of… Six euro!

A bit of a let-down, isn’t it? Some slot machines are programmed to play celebratory trills, animations and messages on every win — even relatively insignificant wins. Regardless of the numbers on the screen, your brain registers the sensory input as a sign that things are going well, even if you’re slowly haemorrhaging money overall.

A 2023 study asked 940 people to watch videos including both genuine wins and LDWs. On average, players confronted with LDWs generally overestimated the player’s success. Further, the study found that low-risk, high-risk and experienced gamblers were all susceptible to this bias.

Some regulatory bodies around the world are clamping down on this. Since 2025, slot machines in the UK can’t celebrate a return that is less than or equal to the value of your spin.

Ergonomics and Environment

Have you ever noticed that casinos typically don’t have any windows or clocks? That the seats are comfy enough to sit in for a long time, but not enough that you can relax?

Casino neuroarchitecture disrupts your cognitive and emotional state to make you lose track of time, which feeds directly into recall bias and overconfidence. Designers often utilise red and gold, which we subconsciously associate with wealth, and bright flashing lights to induce excitement and influence neurotransmittance.

This is the reason that casinos can sometimes feel a bit like a maze. You won’t see straight walkways or clearly marked exits, and machines and tables are laid out so that you have to pass as many gambling opportunities as possible before reaching any facilities.

Psychological design doesn’t just influence how casinos look; a 2006 study revealed that circulating certain aromas around a casino’s ventilation system increased slot play by 46%. To the house, that smells like profit.

The Abstraction of Money

Does €40 seem like a lot? What about 8,000 tokens? Or 0.2 doubloons?

Pushing €1,000 worth of chips towards a blackjack dealer doesn’t feel like giving a grand to a stranger, even though that’s exactly what it is. It’s similar to funding your online casino account with an online transfer, then spending that on intangible spins. The more abstract the value of your money is, the more likely you are to spend it flippantly.

Casino chips were designed strategically to make you think they’re not as valuable as the money they represent. The colourful pieces of plastic are closer to board game pieces than the cold, hard cash you bought them with. Plus, you only have to watch someone take your money once at the cashier, not every time you lose a bet.

Let’s use a real-world example: my online shopping habit. If I saw a Murano glass horse figurine in a shop priced over €100, I probably wouldn’t buy it. Alas, this seemed perfectly reasonable to me scrolling on my phone last night, and it will arrive at my house next Tuesday.

What Should I Do With This Information?

In conclusion, you should never have a thought that might be influenced by your personality, past experiences, environment or beliefs.

Of course, I’m joking. This is impossible — and it wouldn’t even be a good thing. Cognitive biases form the basis of many useful habits, such as the muscle memory that makes us brush our teeth correctly without thinking about it too hard. But when you’re dealing with chance-based activities such as gambling, thinking you’ve got control over a situation when you haven’t might lead to irresponsible habits.

Only gamble for fun, and stay cognisant of your internal biases. Remember that the expected value of a bet always favours the house, never let your brain trick you into thinking you’re ‘due a win’, and make sure to always stick to your budget.

Casino Veteran

Cameron Murphy

Online Casino Expert

An online casino expert of 12 years, Cameron Murphy knows the ins and outs of Irish online casinos. Cameron specialises in online casino reviews, gambling regulations, and providing quality content on online casino games.

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Fact Checked By Vesna Mihajlovic