Level Device

Tilt to center to continue...

cpCST Mobile

Unofficial Implementation

Continuous Performance Critical Stability Task
A high-precision test of sustained attention.

Instructions

Rotate phone to Landscape.
Phase 1: Calibration
Tilt to keep the blue circle centered. It will get harder until you "crash." This repeats 10 times to find your limit.
Phase 2: Test
A continuous session set to your personal difficulty level.

Invert Tilt Controls

Based on MacKay-Brandt et al. (2025)

Calibration Complete

Your Motor Stability Threshold (MST)

0.00

Test difficulty will be 30% of this value.

Select Test Duration:

Paper standard is 10 minutes.

Analyzing Data

Calculating iRT via Dynamic Time Warping...

Test Complete

iRT (Reaction Time) --

Total Crashes 0

Difficulty (MST) --

What do these numbers mean?

iRT (Instantaneous Reaction Time)

This is the main metric from the paper. It calculates the average time lag (in milliseconds) between the dot moving and your hand reacting to correct it.

Lower is better/faster. It is calculated using "Dynamic Time Warping" to align your motion path with the dot's path.

Crashes

Times you lost control (hit the red wall). Zero crashes is ideal, indicating sustained focus throughout the session.

CALIBRATION Trial 1/10

λ: 0.50 --:--