Simple vs Choice Reaction Time and Go/No-Go Explained

Same shape, different response: compare the three tasks

Choose a task below, then use Next cue to see what you would do when a circle or square appears. Simple reaction uses one button for either shape; choice reaction uses a different button for each; Go/No-Go means responding only to the circle. The table compares the rules side by side. This example explains the rules before you try the real exercise.

Choose the action, not the fastest-looking score

Choose simple reaction when you want a task with one signal-response rule: wait for the signal, then make the same response each time. In our illustration, either shape is a signal. The shape does not choose the button.

Choose choice reaction when the signal determines which response is correct. Here a circle means left and a square means right. Both shapes require a response. Pressing the same button quickly for everything does not follow the task.

Choose Go/No-Go when some signals require a response and others require withholding it. Here a circle means respond; a square means do not respond. A correctly withheld response has no button-press time. These task definitions describe different response requirements, not an overall ranking of attention or ability.

Four errors that a time alone can hide

A false start is acting during the waiting period, before a signal. It can occur under any of these rules. A fast premature press is not a successful reaction to the signal.

A wrong choice is selecting right for a circle in our choice example, or left for a square. A miss is failing to make a required response within a real task’s answer window. Our manual illustration has no deadline, so leaving it open does not create a miss.

A false alarm in Go/No-Go is responding to the square when the rule requires withholding. On the same square, withholding is correct in Go/No-Go but fails to provide the required response in choice reaction. The cue did not change; the rule did.

In a real result, read correct responses, wrong choices, omissions and false alarms using that tool’s definitions. A faster time achieved by skipping difficult signals or making more errors is not automatically a better attempt.

Why unlike times are not interchangeable

Different rules, signal probabilities, response windows and input methods change the conditions. A Go/No-Go task with rare no-go signals is not the same task as one that alternates them evenly. Our deliberately short sequence explains answers; it does not prescribe a training ratio.

Do not subtract results from separate browser tools to infer how many milliseconds a mental operation takes. Controlled research comparisons require a specified design; arbitrary sessions do not supply that control. There is no universal number by which one of these tasks must be slower than another.

For a useful personal comparison, repeat the same tool, version, settings, device and input method. Check accuracy and missed responses first, then compare times from the response set the tool actually reports. Do not put a time for correctly withheld responses into an average: there was no response to time.

A small practice decision you can use

If the instructions feel unclear, return to this example and say the rule before each cue. Once the required actions are clear, pick one real task and complete a short session. Review the errors relevant to that rule rather than changing tools until a score looks good.

If you change tasks later, start a separate comparison. Familiarity with the mapping may improve performance on that mapping; it does not prove better driving, sporting performance, workplace focus or general cognitive ability. These browser exercises are not diagnostic tests.

Choose your next exercise

Use the explanation to choose a task. For interpreting milliseconds, medians and device differences, continue to the existing results guide rather than treating this page as a benchmark.

1. Choose one response rule and read its instructions. Complete one session in the matching tool rather than switching between unlike tests to chase a faster number.
2. Review the task’s errors first: false starts, wrong choices, missed responses or false alarms where applicable. Then inspect the time summary for measured responses.
3. For a useful next comparison, repeat the same task with matching settings, device and input method. Keep a different rule separate in History. Repeating a browser task does not establish improvement in driving, sport or everyday attention.

• Simple reaction: one signal response
• Choice reaction: select a response
• Go/No-Go: respond or withhold
• Understand reaction-time results

Source and scope

The linked Neurobehavioral Systems documentation supports the distinction between responding to a signal, choosing a response and withholding on a no-go signal. We use no timing norms, subtraction estimates, experimental stimuli or response ratios from it. The cue sequence and practical explanations are original, not a validated assessment or proof of a training benefit.

Read the task documentation