Table 1.

A summary of all the experiments, including the list of participants and the stimuli and the task(s) used

	Participants	Stimulus set	Task
Experiment 1	P1–P6	8 Natural object categories shown both in original and controlled format	Shape 1-back
Experiment 2	P1–P7	8 Natural object categories in original format shown either above or below fixation	Shape 1-back
Experiment 3	P1–P7	8 Natural object categories in original format shown in either small or large size	Shape 1-back
Experiment 4	P1–P5, P7	8 Natural object categories and 9 artificial object categories both shown in original format	Shape 1-back
Experiment 5	P1–P7	8 Natural object categories shown in original format with both the object and background colored	Shape 1-back or color 1-back, depending on the instructions
Experiment 6	P1–P7	8 Natural object categories shown in original format with colored dots overlaid on top of the object	Shape 1-back or color 1-back, depending on the instructions
Experiment 7	P1–P7	8 Natural object categories shown in original format with only the object colored	Shape 1-back or color 1-back, depending on the instructions