If you participate in a research study that requires you to determine if a target is present very quickly, which of the following presentations are you likely to
take the longest to respond?
Identifying a small red circle in a field of medium and large red circles.
Identifying a red vertical line in a field of small red circles and blue horizontal lines.
Identifying a blue vertical line in a field of red vertical lines.
Identifying a red vertical line in a field of red horizontal and blue vertical lines.