Simon task

How to play

Use the visible key to choose the response assigned to each shape. Circle, triangle and hexagon mean Left; square, diamond and cross mean Right. Level 1 uses circle and square, level 2 adds triangle and diamond, and level 3 adds hexagon and cross. Ignore where the shape appears: a circle on the right still means Left. Tap the buttons or use the Left and Right arrow keys. Read the feedback, then choose Next, or press Enter or Space. Complete twenty-four trials at your own pace; there is no response deadline. Results separate matching-side and opposite-side accuracy for this round.

Use touch or a mouse, or Tab to move between controls and Enter or Space to select.

Self-paced shape-response practice inspired by the Simon task. Accuracy and active time describe this round; they do not measure a laboratory Simon effect or provide a clinical attention score.