Figure 1
From: Drift-diffusion explains response variability and capacity for tracking objects
Experimental paradigm. (a) Schematic of one-ball experiment: after an ITI of 2 seconds, subject saw a rightward moving green ball that was presented 1.5 seconds before disappearing under an opaque cover. Subjects had to estimate the TTC for this ball with respect to the red line drawn over the cover by pressing a key after the ball went under the occluder. If the subject pressed within 10 seconds a happy emoji would be presented for 0.5 seconds, otherwise, a sad emoji was presented for 0.5 seconds. No feedback about accuracy of TTC judgement was provided. (b) Schematic of two-ball experiment: same procedure as the one-ball experiment except that two green balls with different speeds moving rightward were shown. Both balls went under the cover at the same time and subjects had to press the down button to estimate the TTC of each ball with respect to the red line.
