Instructions: When you see the large purple circle at center‑screen, press SPACEBAR (desktop) or tap it (mobile) as fast as possible.
Purpose: Measure raw reaction time with a large, central stimulus.
Click Start to begin!
Level 2
Instructions: Purple circle appears at random locations. Press SPACEBAR or tap as soon as you see it.
Purpose: Measure spatial raw reaction time with a large stimulus.
Click Start to begin!
Level 3
Instructions: Medium purple circle at center; press SPACEBAR or tap quickly.
Purpose: Measure raw reaction time with medium stimulus.
Click Start to begin!
Level 4
Instructions: Medium circle at random positions; press SPACEBAR or tap immediately.
Purpose: Measure spatial raw reaction time with medium stimulus.
Click Start to begin!
Level 5
Instructions: Small purple circle at center; press SPACEBAR or tap as fast as possible.
Purpose: Measure raw reaction time with small stimulus.
Click Start to begin!
Level 6
Instructions: Small circle appears randomly; press SPACEBAR or tap quickly.
Purpose: Measure spatial raw reaction time with small stimulus.
Click Start to begin!
Level 7
Instructions: X-small circle at center; press SPACEBAR or tap immediately.
Purpose: Measure raw reaction time with very small stimulus.
Click Start to begin!
Level 8
Instructions: X-small circle appears randomly; press SPACEBAR or tap quickly.
Purpose: Measure spatial raw reaction time with very small stimulus.
