Every day, the human mind takes shortcuts. Cognitive biases — systematic errors in how we process information — influence everything from how we evaluate risk to how we interpret the behaviour of others. Psychologists work with clients to identify these patterns, and one of the most vivid arenas for observing them is games of chance and skill.
What Cognitive Biases Are
Cognitive biases are not random errors or signs of low intelligence. They are predictable, systematic deviations from what would be objectively rational — the product of mental shortcuts (heuristics) that work reasonably well most of the time but fail in specific, identifiable ways. Psychologists Daniel Kahneman and Amos Tversky, whose research on decision-making under uncertainty earned a Nobel Prize in Economics, demonstrated that these patterns are universal across cultures and largely resistant to simple correction by knowing they exist.
In clinical psychology, cognitive biases are central to understanding how certain patterns of thinking maintain distress. Cognitive Behavioural Therapy is built in large part on the identification and modification of such biases. But biases also operate in everyday contexts — in financial decisions, in social judgements, and in recreational activities that involve probability and risk.
The Gambler's Fallacy
The gambler's fallacy is the belief that independent random events are influenced by previous outcomes. At a card table, this manifests as the conviction that because red has appeared several times in a row, black is now "due." In reality, each deal, each spin, each draw is statistically independent of what came before. The deck has no memory.
In therapy, a related pattern appears when people interpret a run of bad outcomes as evidence that they are due for something good — or conversely, that success this week means failure is coming. Understanding the actual independence of events is useful both in games of chance and in thinking more clearly about life's setbacks and triumphs.
The Sunk Cost Fallacy
The sunk cost fallacy describes the tendency to continue an investment — of time, money, or effort — because of what has already been spent, rather than because of what the future investment is likely to produce. At the card table, this looks like staying in a hand longer than the odds warrant because one has already put chips in. The money already wagered is gone; the only rational question is whether the next bet is worthwhile on its own merits.
Clinically, sunk cost thinking maintains people in situations — relationships, careers, patterns of behaviour — that no longer serve them, simply because of what they have already invested. Recognising the fallacy does not mean abandoning everything that requires effort; it means evaluating the present and future honestly, separate from past investment.
Availability Heuristic and Risk Assessment
The availability heuristic leads us to assess the probability of an event based on how easily an example comes to mind. Vivid, emotionally resonant outcomes feel more likely than they statistically are. This is part of why people who have recently heard about a dramatic win at a casino may overestimate their own chances — the example is memorable and accessible.
In therapy, the availability heuristic often operates in anxiety. Catastrophic outcomes feel probable because they are vivid and can be easily imagined, regardless of their actual likelihood. Helping clients assess risk more accurately — asking "what is the evidence?" rather than "what feels possible?" — is a core component of cognitive restructuring.
Overconfidence and the Illusion of Control
Studies of decision-making consistently show that people overestimate their own skill in situations where chance plays a significant role. In games where outcomes depend partly on skill — such as poker — this can produce a dangerous underestimation of the role of luck in any given hand. The illusion of control is closely related: people behave as though their choices influence outcomes that are, in fact, determined by chance.
Psychologically, the illusion of control is not always harmful. It often motivates effort and persistence. But in contexts where outcomes genuinely depend on probability, it leads to systematically poor calibration between confidence and actual likelihood.
Applying This Outside the Game
The reason these biases are studied so closely in gambling contexts is that card games and similar activities provide unusually clear feedback loops: the outcome is definite, rapid, and measurable. This makes them ideal research settings for studying decision-making — and the findings transfer directly to how we make decisions in everyday life.
Recognising these patterns in yourself does not make them disappear, but it does create space between the impulse and the action. Whether the context is a game of chance or a significant personal decision, the same basic skill applies: pause, examine the reasoning, and ask whether what feels true actually matches the available evidence. The Canadian Psychological Association provides resources on psychological approaches to thinking and decision-making.
Adults who choose to play games of chance — cards, casino games — are entitled to enjoy that activity. The research simply suggests that doing so with a clear-eyed understanding of cognitive biases leads to better decisions and more enjoyment. Play for entertainment, set clear limits before you start, and know that past results carry no information about future ones. For support with gambling-related concerns, the Responsible Gambling Council offers free, confidential resources. Gambling is for adults aged 19 and older.