Effects of information conflict on Stroop task (left) and flanker task (right) behavior, measured by computing differences in reaction times (top rows) and correct reaction rates (bottom rows) on incongruent relative to congruent stimulus trials. Columns ‘F’ and ‘p’ indicate results from statistical tests on AP-related differences between selected concordant or discordant twin samples. Degrees of freedom for the listed ‘F’ values are (1,14) and (1,6) for concordant and discordant twin comparisons, respectively. Asterisk indicates statistically significant difference.