Simulation Thinking: Running It in Your Head First

• Opening: A Movie the Night Before an Interview
• What Is Mental Simulation
• Why Mental Rehearsal Works: Clues from Cognitive Science
• Where to Use It: Four Stages
  • 1. Decision-Making
  • 2. Hard Conversations
  • 3. Presentations
  • 4. Matches
• Scenario Planning: Drawing the Future in Several Branches
• Imagining Worst and Best Together
• Reducing Anxiety with Cognitive Rehearsal
• Applying It to Learning and Career
• The Trap: Over-Simulation and Analysis Paralysis
• Practice: A 5-Minute Mental Rehearsal Routine
  • Pre-Execution Checklist
• Frequently Asked Questions (FAQ)
• Closing: The Composure of Someone Who Lived It in Advance
• References

Opening: A Movie the Night Before an Interview

The night before a job interview, before falling asleep, I ran a movie in my head. Walking into the room, greeting them, introducing myself, fielding a tricky question, pausing for a beat, then answering calmly — all of it. On the actual day, curiously, I trembled less. It felt like something I had already been through once.

As a developer I do code reviews, give talks, and play table tennis matches on weekends. Along the way I noticed something. People who are good at things run it once in their heads before the real game. Athletes picture the match, presenters flip through slide transitions in their minds, negotiators simulate the other side's reactions in advance.

This essay is about that "mental rehearsal" — mental simulation. What it is, why it works, how to use it, and when to stop.

What Is Mental Simulation

Mental simulation is concretely replaying, in your head, a situation that has not happened yet. It differs from a vague wish like "I hope it goes well." It is an active thought process of picturing the scene, the sequence, the sensations, and even the other person's reactions as concretely as possible.

Cognitive psychology divides it broadly into two kinds.

• Outcome simulation: imagining the scene of having reached the goal. Picturing "me, happy because I passed."
• Process simulation: picturing the steps that lead to the goal. Picturing "me preparing, answering, and responding calmly."

Interestingly, research says process simulation is more effective. A 1998 study by the psychologist Shelley Taylor and colleagues reported that, among students facing an exam, the group that imagined "the process of studying" actually studied more and scored better than the group that imagined "getting a good grade." Picturing only the outcome makes you complacent and reduces action, while picturing the process makes the plan concrete.

Why Mental Rehearsal Works: Clues from Cognitive Science

Why does something run in the head help actual performance? There are several grounds.

First, motor imagery research. There are many reports that merely picturing a movement in your head, without actually doing it, activates a substantial part of the same brain regions that fire during the real action. That is why an athlete sidelined by injury can use imagery training to slow the decline in skill. That said, imagery does not fully replace real training; it is closer to a complement.

Second, the predictive processing view. The brain is an organ that constantly predicts what will happen next. Simulate in advance, and the real situation falls within the predicted range, so surprise drops and responses speed up accordingly.

Third, familiarity and reduced anxiety. A first experience is frightening. But something experienced many times in the head is no longer a "first." That is why I trembled less on interview day.

Champions saw themselves as champions before they became champions. — a saying often cited in sports psychology, capturing the heart of imagery training.

Where to Use It: Four Stages

Mental simulation can be used on many everyday stages.

1. Decision-Making

Facing a big decision, concretely replay the future for each option. If I switch jobs, what would a day of mine look like six months later? If I decline, what regret or relief would remain? A representative technique is the "premortem," proposed by the psychologist Gary Klein. Before deciding, you assume "this decision has completely failed a year from now, and write backward why it failed."

2. Hard Conversations

Conversations like salary negotiation, conflict resolution, and delivering feedback change greatly when rehearsed. Picture not only what you will say but three likely reactions from the other side, and prepare your response to each. Then in the real conversation, panic drops.

3. Presentations

Just before a talk, run the whole thing: standing on stage, saying the first sentence, flipping a slide, answering anticipated questions. In particular, simulating "anticipated questions" greatly reduces Q&A fear.

4. Matches

Before a table tennis match, I picture the opponent's serve patterns and my returns. I pre-experience even the scene of conceding the first point and the scene of breathing calmly at deuce. Then when that situation actually arrives, there is less panic.

Scenario Planning: Drawing the Future in Several Branches

Scaling personal mental simulation to the organizational level gives you scenario planning. This technique is famous from the 1970s case of the oil company Shell, which used it to weather the oil shock relatively well.

The point is not "to predict one future exactly." Rather, it is "to draw several different futures and prepare how to respond to each." The future is unpredictable, but widen the range of possible scenarios and you panic less whatever future arrives.

Applying it personally is simple. When making an important plan, draw the future in at least three branches.

[Scenario planning -- 3 branches]

         /-- Best: if everything works out? --> what to prepare?
plan ---+--- Middle: if it goes smoothly?  --> default response
         \-- Worst: if the core collapses?  --> contingency (Plan B)

Draw all three and you reach a prepared state — neither vague optimism nor vague pessimism.

Imagining Worst and Best Together

Here two classical techniques meet.

One is the Stoic premeditatio malorum — thinking of bad things in advance. Seneca held that imagining the misfortunes that could happen reduces the shock when they actually arrive. This is closer to immunization than pessimism — a mental vaccine of having been through it once already.

The other is positive psychology's imagining the best. But as we saw, picturing only the outcome complacently actually reduces action. So the key is to picture not "the best outcome" but "the process toward the best."

Before something important, I write both down.

• Worst: what could go wrong? Then how do I respond? (Plan B)
• Best: if it works out, what does that process look like? To get there, what do I do now?

Write the two together, and fear drops while action rises.

Reducing Anxiety with Cognitive Rehearsal

Mental simulation is also used to handle anxiety. In clinical settings this is called cognitive rehearsal and is used as a technique within cognitive behavioral therapy (CBT). You pre-experience a feared situation, repeatedly, within a safe imagination.

The principle is simple. Anxiety feeds on the unknown. Concretely picture the situation in your head, decide how to begin and how to respond, and the unknown turns into the known. Then anxiety's fuel diminishes.

But there is an important balance here. Simulation for handling anxiety must focus on the response. If you only repeatedly replay the bad outcome and cannot get out, it becomes rumination rather than rehearsal and instead grows anxiety. When psychological difficulty is severe, it is better to seek a professional's help than to struggle alone. This essay is not medical advice.

Applying It to Learning and Career

Mental simulation is powerful for learning too. But it has an even stronger partner: retrieval practice. Simulate "how would I explain this concept" in your head, then actually close the book and try to recall it. Simulation sets the stage; retrieval builds the muscle.

The same holds for career. Benjamin Hardy's "Future Self" concept is to concretely picture who you want to be in a few years and design present action backward from there. This too is a kind of long-term simulation. Not a vague "I want to succeed," but "what problems am I solving three years from now, and what must I learn this year to get there?"

Here too, like the 70-20-10 learning principle (70 percent hands-on experience, 20 percent learning from others, 10 percent formal education), remember that simulation plays the 10-to-20 role of preparing for the real thing — it cannot replace the 70 of real practice.

The Trap: Over-Simulation and Analysis Paralysis

Now the opposite view. Mental rehearsal is powerful, but in excess it becomes poison.

The most common trap is analysis paralysis. Endlessly simulating every possible case, you never even start to act. The person who interviewed a hundred times in their head but never submitted the application falls here. Simulation must be preparation for action, not a substitute for action.

The second trap is degeneration into rumination. As noted, replaying only the bad outcome only grows anxiety.

The third trap is the planning fallacy. Mental simulations are often too smooth. They tend to underestimate variables and friction. So it is good to deliberately insert "something unexpected" into the simulation.

The key prescription: put a deadline on the simulation, and when it ends, always move on with one small action.

Practice: A 5-Minute Mental Rehearsal Routine

Here is a tangible procedure. Before something important, five minutes is enough.

1. Pick the scene: choose just one moment to replay. (e.g., the first minute of a talk)
2. Draw it as process: picture steps, not the outcome — start, middle, finish.
3. Insert 3 reactions: assume favorable, neutral, and difficult reactions, and prepare your response to each.
4. Add one friction: deliberately insert one unexpected variable and picture your response.
5. Write one line of worst-case Plan B: so you do not crumble even if the worst comes.
6. Close it and move to action: when five minutes pass, stop and immediately do one small preparatory action.

Pre-Execution Checklist

• Did I draw process rather than outcome?
• Did I assume at least one reaction from the other side?
• Did I insert at least one unexpected friction?
• Do I have a worst-case response (Plan B)?
• Is the simulation becoming an excuse to postpone action?

Frequently Asked Questions (FAQ)

Q. I lack imagination and can't picture it well. Everyone is like that at first. If your visualizing is weak, draw it "in words." Just reciting the procedure as sentences in your head has an effect.

Q. Doesn't imagining the worst make me more anxious? It does if you stop at imagining. You must always picture "and then this is how I respond." The moment a response is attached, anxiety turns into a sense of control.

Q. Is simulation more effective than real practice? No. Simulation is a complement to real practice. It is most powerful used together with the real thing; alone its limits are clear.

Closing: The Composure of Someone Who Lived It in Advance

I return to the night before the interview. The movie I ran in my head that night may not have changed the outcome. But it clearly changed my mind. It turned a first experience into a second one, and turned fear into preparation.

The essence of mental simulation is not prophesying the future. It is living the future once in advance and finding out what to prepare from it. But you must not live only in your head and end there. Rehearsal is for the stage.

Before your next important moment, close your eyes for a moment and run one short movie. And when that movie ends, be sure to step onto the stage.

References

• Pham, L. B. and Taylor, S. E. (1999). From thought to action: Effects of process- versus outcome-based mental simulations on performance — https://pubmed.ncbi.nlm.nih.gov/
• Gary Klein, "Performing a Project Premortem," Harvard Business Review — https://hbr.org/2007/09/performing-a-project-premortem
• Driskell, J. E., Copper, C., and Moran, A. (1994). Does mental practice enhance performance? (imagery training meta-analysis) — https://www.ncbi.nlm.nih.gov/
• Seneca, Letters to Lucilius — premeditatio malorum (thinking of bad things in advance).
• Benjamin Hardy, Be Your Future Self Now (2022).
• Overview of retrieval practice / testing effect: Roediger, H. L. and Karpicke, J. D. (2006) — https://www.ncbi.nlm.nih.gov/
• Overview of scenario planning (including the Shell case): Harvard Business Review — https://hbr.org/2013/05/living-in-the-futures
• James Clear, on small actions and systems — https://jamesclear.com/