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Diagrams illustrating three examples of a visual array used in the colour, size, and shape tasks (not to scale; images in greyscale): (a) the target was a letter in a different colour (e.g., white) to the distractors (grey) in a 4-item display; (b) the target was letter “M” in large size among small distractors in an 8-item display; (c) the target was letter “E” among different shape distractors in a 12-item display.
