Atsma J, Koning A, Van Lier R, 2011, "Tracking bouncing balls: Default linear motion extrapolation" Perception 40 ECVP Abstract Supplement, page 90
Tracking bouncing balls: Default linear motion extrapolation
J Atsma, A Koning, R Van Lier
We investigated attentional anticipation using a multiple object tracking task (3 targets , 3 distractors) combined with a probe-detection task. In the first experiment we showed an increased probe detection rate at locations to where a target is heading, which indicates such attentional anticipation. In the second experiment we investigated whether this extrapolation is susceptible to physically plausible bouncing behavior. We tested this by introducing a wall in the center of the screen. In one condition, the objects realistically bounced against the wall, whereas in the other (control) condition the objects went through the wall. The conditions were presented in a blocked design. A probe could appear on either side of the wall just before a target coincided with the outline of the wall. The probe appeared at the location where the target object would be within half a second after bouncing or after following the original (linear) trajectory. Whereas tracking performance was similar in both conditions (bouncing and not bouncing), probe detection was optimal for locations in the linear motion path, again for both conditions. Apparently, given the current task settings, the visuo-attentional system does not incorporate complex (bouncing) motions but rigorously extrapolates linear motion trajectories.
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