Assessment Suite · Reaction Suite

Go/No-Go Color Test

Benchmark your cognitive inhibition and motor control. The screen will flash random colors. Click or tap **ONLY when the color is GREEN**. If any other color flashes, suppress your click.

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Go/No-Go Color Test

Click the screen ONLY when GREEN appears. If other colors flash (Red, Blue, Purple, Yellow), suppress your click and wait. False clicks or misses carry a +250ms penalty!

Click card to start

Learn about calibration protocols and scientific formulas on our Methodology Page.

What is a Go/No-Go Test?

The Go/No-Go test is a classic psychological paradigm used to measure **inhibitory control**—the cognitive ability to suppress prepotent motor impulses and inappropriate actions.

In this color variant, the "Go" signal is the color **Green**, while all other colors (Red, Blue, Purple, Yellow) act as "No-Go" distractors. Your prefrontal cortex must rapidly classify the flashing stimulus and make a binary split-second decision: release a motor action (click) or actively suppress it.

Commission Errors vs. Omission Errors

This test measures two types of errors:

False Alarms (Commission Errors): Clicking when a No-Go distractor (e.g. Red) appears. This indicates a failure of executive motor inhibition and carries a **+250ms penalty** per occurrence.
Missed Targets (Omission Errors): Failing to click when the Go target (Green) appears. This indicates lapses in sustained attention or focus.

Frequently Asked Questions

What is a normal Go/No-Go reaction score?

Because of the decision check required, Go/No-Go response latency is typically **80ms to 120ms slower** than a simple reaction test. A normal score is around 320ms to 380ms. Under 280ms is exceptional, and scores above 450ms indicate fatigue, distraction, or high false alarm rates.

How does the calibration work?

The test runs on a double-buffered requestAnimationFrame loop to sync the random color flash to your monitor's actual screen refresh rate, bypassing browser rendering jitter.