Go / No-Go

Most trials are go trials, where you respond as fast as you can. A minority are no-go trials, where you must do nothing. Because the vast majority ask you to press, you build a habit of pressing, and each no-go trial asks you to override that habit at the last moment. Stopping a response you have already started is harder than it sounds.

That is the core skill: response inhibition, sometimes called impulse control. The task pits speed against restraint. Go too cautious and your reaction time balloons. Go too eager and you press on no-go trials. A good performance threads the needle, staying fast on go trials while still catching yourself on the rare no-go.

This is the classic go/no-go task, a staple of experimental psychology used to study attention and inhibitory control. The design is deliberately lopsided: because go trials dominate, pressing becomes automatic, so the no-go trials genuinely test whether you can withhold a prepared action rather than simply choose slowly.

Three numbers describe your performance, and each tells you something different:

• Reaction time on go trials: how fast you respond when you are supposed to. Faster is not automatically better if it comes with more errors.
• Commission errors (false alarms): pressing on a no-go trial. This is the main index of failed inhibition.
• Omission errors: failing to press on a go trial, which usually signals a lapse of attention rather than over-eager responding.

Read them together. A very fast reaction time paired with many commission errors means you traded restraint for speed. Many omission errors with few commissions often means your attention drifted.

On go trials, reaction times commonly land in the range of a few hundred milliseconds, similar to other choice-response tasks, though the exact figure depends on the pace and your hardware. Commission errors are the more revealing metric: because the go habit is strong, most people commit at least a few false alarms, and that is normal rather than a red flag.

• Fast but sloppy: low reaction time, higher commission errors. You are riding the go habit.
• Cautious and clean: higher reaction time, very few commission errors. You are prioritizing restraint.
• Drifting attention: rising omission errors, where you miss go trials you meant to press.

There is a built-in trade-off known as the speed-accuracy trade-off. You can almost always cut errors by slowing down, or shave time by accepting more mistakes. The interesting question is where you naturally sit on that curve, not whether you can max out one number at the expense of the other.

You can improve your balance on this task, mostly by managing your own strategy rather than gaining a new ability. Practice teaches you the pace and helps you resist the go habit on no-go trials. As with most of these tasks, the gains are largely specific to go/no-go and tend to plateau.

• Do not pre-commit. Avoid deciding to press before you have actually read the trial; that is what produces commission errors.
• Keep a steady pace. Racing to set a record usually spikes your false alarms.
• Stay engaged on every trial. Omission errors are lapses, so a wandering mind shows up directly.
• Warm up and expect regression. Your first block understates you, and one unusually clean run may not repeat.

A hard rule about interpretation: this task does not diagnose anything. It is used in attention research, but a high commission-error count is not a diagnosis of ADHD or any other condition. Many ordinary factors, including tiredness, caffeine, the time of day, and your device, move these numbers. Treat your result as a snapshot of how you did today, not a label.

Small conditions shift all three metrics, so read a single session as approximate. The proportion of no-go trials, the speed of presentation, and your alertness all matter. A faster pace pushes reaction time down but drives commission errors up.

• Chasing speed: trying to post a fast reaction time almost always raises commission errors.
• Over-caution: waiting too long avoids false alarms but inflates your reaction time and can cause omissions.
• Attention lapses: a brief drift produces omission errors on trials you fully intended to press.
• Practice effects: familiarity with the pace improves your numbers over the first few tries.
• Fatigue and distraction: inhibition weakens when you are tired or multitasking, so results sag late in a session.