Experimental design.

<p>The stimuli (target and flankers) in each type of trial in the incongruent and congruent direction conditions are shown along with cartoons of the corresponding fingers involved. Target (correct) responses (green) with one (1T) or two (2T) fingers were indicated by a single arrowhead or double arrowhead target stimulus, respectively. Similarly, incorrect (flanker) responses (red) with one (1F) or two (2F) fingers were induced by single arrowhead or double arrowhead flanker stimuli, respectively. Yellow indicates fingers that were involved in both the error and correct responses, and thus did not have independent representation. White indicates fingers that were not involved in either response option.