Cognitive Task
Go/No-Go Task
Can you hold back when you need to? This task measures response inhibition: your ability to withhold an automatic response when a stop signal appears.
The Science of Response Inhibition
The Go/No-Go task is a well-studied cognitive paradigm used in neuroscience and psychology research. Here is what the literature says about what it measures and how to interpret it.
From the Research
"Response inhibition is a hallmark of executive control."
— Verbruggen, F. & Logan, G. D. (2008). Response inhibition in the stop-signal paradigm. Trends in Cognitive Sciences, 12(11), 418-424.
Response inhibition is the ability to suppress actions that are no longer appropriate or required. In a Go/No-Go task, this means withholding a response you have been primed to give.
The Go/No-Go task specifically measures action restraint: stopping yourself before you start. This is different from action cancellation (stopping mid-action), which is measured by the Stop-Signal Task.
This distinction matters. The two tasks recruit partially different cognitive mechanisms, so results from one do not directly translate to the other.
"While on a typical GNG task the no-go sign is presented simultaneously with or instead of the go stimulus..."
— Littman, R. & Takács, Á. (2017). Do all inhibitions act alike? A study of go/no-go and stop-signal paradigms. PLOS ONE, 12(10).
The core idea is simple: make one response automatic, then test whether you can stop yourself. By showing Go trials 75% of the time, pressing becomes a habit. The 25% of No-Go trials then require active withholding.
What gets measured
- Commission errors (false alarms): pressing when you should have held back. This is the primary measure of inhibition failure.
- Omission errors: failing to press on Go trials. This reflects attention lapses.
- Reaction time: how fast you respond on correct Go trials. Very fast responses with many errors suggest impulsive responding. Very slow responses with few errors suggest a cautious strategy.
From the Research
"Reliabilities ranged from 0 to .82, being surprisingly low for most tasks..."
— Hedge, C., Powell, G. & Sumner, P. (2018). The reliability paradox: Why robust cognitive tasks do not produce reliable individual differences. Behavior Research Methods, 50(3), 1166-1186.
"The Pearson correlation in the error score ('false presses') between these two occasions was 0.65..."
— Robertson, I. H. et al. (1997). Performance correlates of everyday attentional failures in traumatic brain injured and normal subjects. Neuropsychologia, 35(6), 747-758.
Cognitive tasks like Go/No-Go can work well as experimental measures while still being noisy for ranking individuals. Commission error scores show moderate stability across sessions under some implementations, but your results should be treated as a single-session snapshot.
Sleep, stress, distraction, your device, and even your response strategy (fast vs. cautious) all affect performance. That is why we present patterns rather than diagnostic labels.
This implementation draws on several published sources but is not a copy of any single instrument. Here is what shaped our design:
- Construct definition: Grounded in Verbruggen & Logan's (2008) framework distinguishing action restraint from action cancellation.
- Task structure: Letter-based Go/No-Go with 3 Go letters and 1 No-Go letter per block, modeled on the structure described in Hedge et al. (2018).
- Trial ratio: 75% Go / 25% No-Go to establish prepotent responding while keeping enough No-Go trials for stable estimates.
- Scoring: Signal detection metrics (d' and criterion) computed using standard corrections from Stanislaw & Todorov (1999).
- Web adaptation: 1000 ms response window, 250 ms fixation, 500 ms inter-trial interval. These timings balance measurement quality with web feasibility.
Scores are not directly comparable to any single published dataset. Web delivery adds timing variability from your browser and device, and our specific parameter choices differ from lab implementations.
How Each Trial Works
Every trial follows this sequence. You have 1 second to respond after the letter appears.
The 75/25 Split
Three out of every four trials are Go trials. That ratio makes pressing feel automatic. When a No-Go trial appears, your brain has to actively override that habit.
Signal Detection
Your responses fall into four categories. Commission errors (pressing on No-Go) are the primary measure of inhibition difficulty.
Related Cognitive Assessments
Response inhibition is one part of cognitive control. These other assessments measure related constructs.
About This Implementation
This is a research-inspired web implementation of the Go/No-Go paradigm. It is an educational tool, not a clinical instrument. Results reflect a single session and are influenced by your device, environment, and current state.
Task structure adapted from the letter-based Go/No-Go described in Hedge, Powell & Sumner (2018). Signal detection scoring follows Stanislaw & Todorov (1999). Construct framing based on Verbruggen & Logan (2008). We are not affiliated with any of these researchers or institutions.
This task does not diagnose ADHD, anxiety, OCD, or any other condition. It does not measure real-life self-control or willpower. Performance reflects a mix of inhibition, attention, motivation, and motor speed in a brief, artificial context. If you have concerns about impulsivity or attention, consult a qualified professional.
Reaction time measurements are affected by your browser, operating system, and keyboard. Results from touchscreens are not comparable to keyboard input. Sleep, fatigue, stress, and distractions all influence performance. Treat your results as a snapshot, not a permanent score.