There were a total of nine trials in the shape bias task. The placement of the feature matches
(shape, color, and size) was counterbalanced across the trials. For example, one third of the trials
had the shape match on the left side of the screen, one third of the trials had the shape match in
the middle of the screen, and one third of the trials had the shape match on the right side of the screen.
In addition, the features used in this task were not repeated across trials (i.e., distinct shapes, colors,
and sizes on each trial) or used in the feature memory task.