Why Some People Always Imagine the Best and Worst Outcomes, According to Psychology

Some people find it difficult to make an important decision without mentally exploring several possible futures. Before a job interview, they may imagine getting the position and being rejected. Before a trip, they may picture a memorable holiday as well as flights being delayed or plans falling apart. Even before sending an important message, they might consider both a positive response and the most difficult response they can imagine.

This can look like overthinking, but psychology offers several possible explanations.

Thinking about different futures can involve prospection, mental simulation, defensive pessimism and efforts to manage uncertainty. These processes can sometimes help people prepare for challenges. In other situations, however, repeated scenario-building can become worry that makes decisions harder rather than easier.

The key difference is what the thinking leads to.

Prospection

Psychologists Daniel Gilbert and Timothy Wilson have studied prospection, which refers broadly to people’s ability to imagine and evaluate possible future experiences.

Rather than simply waiting for events to unfold, people can mentally construct possible outcomes and consider how those outcomes might make them feel. These imagined futures can then influence decisions in the present.

Someone considering a new job, for example, might imagine earning a higher salary, enjoying the work and developing new skills. They might also imagine longer hours, difficult colleagues or reduced time with family.

Comparing these possibilities can help turn an uncertain decision into something that feels easier to evaluate.

However, imagined futures are not predictions. People can misjudge both what will happen and how they will feel when it does.

Simulation

Mental simulation can also be useful when it focuses on the steps required to reach a goal.

Research by Shelley Taylor and Liena Pham examined differences between imagining an outcome and imagining the process needed to achieve it. Their work suggested that process-focused simulation can support goal-directed effort and performance.

Consider a student preparing for an examination. Imagining an excellent grade provides a desired outcome. But mentally rehearsing the process of studying, revising difficult topics and completing practice tests provides a more practical guide for action.

The distinction matters because simply imagining success is different from imagining the behaviors that could make success more likely.

Pessimism

Worst-case thinking can also have a less obvious psychological function.

Psychologist Julie Norem developed the concept of defensive pessimism, a strategy in which people set relatively low expectations and mentally consider possible negative outcomes before an important situation.

Someone preparing for a presentation might imagine forgetting an important point, encountering a technical problem or receiving a difficult question.

They can then respond by rehearsing more thoroughly, preparing backup materials or anticipating questions.

In that context, negative thinking has produced preparation. The person is not necessarily convinced that failure will occur. Instead, considering what could go wrong gives them reasons to prepare.

Norem’s work describes defensive pessimism as a strategy that can help some people manage anxiety and approach challenging situations.

Contrast

Another useful framework comes from psychologist Gabriele Oettingen’s research on mental contrasting.

Mental contrasting involves imagining a desired future and then considering the obstacles that could prevent it from happening. The approach differs from simply fantasizing about a positive outcome because it connects the desired result with the practical barriers standing in the way.

Imagine someone who wants to exercise more regularly.

The positive future might involve feeling healthier and having more energy. The obstacle could be a demanding work schedule. Recognizing that obstacle allows the person to develop a specific response, such as exercising before work or scheduling shorter sessions.

The value comes from connecting imagination with action.

Uncertainty

For some people, however, the repeated search for possible outcomes may be driven by difficulty tolerating uncertainty.

Intolerance of uncertainty describes a tendency to find uncertain situations particularly difficult to tolerate. Research has linked this tendency with worry and anxiety.

A 2026 preregistered meta-analysis involving 28,693 participants found robust associations between intolerance of uncertainty, worry and anxiety. The researchers also described worry as an important cognitive process connecting uncertainty with anxiety.

This can create a repeating pattern.

A person may first ask, “What if everything goes well?”

Then comes another question: “What if everything goes wrong?”

Soon another possibility appears: “What if something happens that I have not considered?”

At that point, thinking about possibilities may no longer be helping the person prepare. Instead, the uncertainty itself becomes the problem.

Preparation

Mental simulation can nevertheless have practical benefits.

A systematic review and multilevel meta-analysis covering 123 effects and 5,685 participants found a reliable positive effect of mental simulation on behavior change, although its effectiveness varied depending on the type of simulation involved.

That helps explain why some people who regularly imagine negative outcomes can appear particularly prepared.

A traveler who imagines missing a flight may leave home earlier. Someone preparing a presentation may save a second copy of their slides. A parent anticipating a difficult conversation with a child may think about several ways to explain the issue.

In each example, an imagined problem leads to a concrete precaution.

Overthinking

The distinction between planning and overthinking is not always obvious.

Scenario planning can become unhelpful when someone feels compelled to examine every possible outcome before taking action. They may repeatedly rehearse conversations, research every possible consequence of a decision or imagine increasingly unlikely problems.

Instead of reducing uncertainty, the process can generate more questions.

This is one reason the outcome of the thinking matters. Useful planning tends to produce a decision or a practical step. Excessive worry can leave a person searching for certainty that may not be available.

Research on intolerance of uncertainty has also found that psychological interventions targeting this difficulty can reduce both intolerance of uncertainty and worry.

Balance

People who regularly imagine both the best and worst possible outcomes are not necessarily pessimists or anxious by nature.

They may simply have a strong tendency toward future-oriented thinking. Some may use mental simulation to prepare for challenges. Others may use defensive pessimism to manage performance concerns. Some may naturally compare desired outcomes with potential obstacles.

But if the process becomes repetitive, difficult to control and disconnected from useful action, worry may be playing a larger role.

The important question is therefore not how many scenarios someone imagines. It is what happens afterward.

If imagining different futures helps someone prepare, make a decision or take a sensible precaution, the process can be useful. If it keeps them searching for certainty and prevents them from acting, it may have become a form of unproductive worry.

The future cannot be fully rehearsed in advance. Sometimes, the healthiest response to uncertainty is not to imagine one more scenario, but to decide what can be controlled and take the next practical step.

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