Stop Signal Task
About
Stop Signal Task
The Stop Signal Task (SST) is used in research to estimate response inhibition — the ability to cancel an action that has already begun.
What it measures- The Stop Signal Reaction Time (SSRT) — an estimate (ms) of how long it takes to stop a response
- Mean reaction time (ms) on go-trials (no stop signal)
- The range of Stop Signal Delays (ms) used during the task
Stop Signal Task
Prerequisites
Before you begin
- Make sure you can see the screen clearly
- Use a modern browser and close other demanding applications
- Rest your left finger on S and your right finger on L
- Keep this tab visible for the full task; hidden-tab trials fail the timing check
⚠ Although used in ADHD research, the SST is not a diagnostic tool. It only gives
a basic description of inhibitory control. Data will be recorded for academic research.
Stop Signal Task
Instructions
How it works
- When you see ← press S
- When you see → press L
- When you see ✕ press nothing!
- Respond as quickly and accurately as possible. Do not slow down or wait for a stop signal.
- The stop delay adapts so that stopping succeeds on about half of stop trials. It becomes harder if you wait.
Stop Signal Task
Step 1 of 1
Settings
Number of trials
⚠ 200 is the minimum protocol for a group-level SSRT estimate.
Practice
+
Stop Signal Task
Practice complete
Ready for the measured trials
Keep responding quickly on arrow trials and do not wait for the stop signal.
Stop Signal Task
Short break
Block complete
Aim for no missed arrow responses and about 50% responses on stop trials. Keep responding quickly rather than waiting.
Task Results
Summary