Zuerst oder gleichzeitig?

First or at the Same Time?

In each trial you see two boxes to the left and right of a cross. A circle appears in one box and a square in the other – one shortly after the other or exactly at the same time.

Just before, one of the boxes is marked: its outline turns thick for a moment. The marking says nothing about which shape comes first: the shape in the marked box comes first just as often as the other one.

Keep your eyes on the cross in the middle during a trial.

The task has two parts. In one part you say which shape came first: F for the circle, J for the square. In the other you say whether both came at the same time: F for ‘same time’, J for ‘in sequence’. On a phone, tap the two fields below the boxes.

Speed does not matter; you have 2.5 seconds for each answer. If you are unsure, go with your impression.

Before each part you practise 4 trials with feedback; then 54 trials follow in each part without feedback. The whole task takes about 5 minutes.