First, we hypothesized that in a matched condition participants would experience the greatest flow (reported task absorption) and demonstrate a peak in objective indices of goaldirected and efficient visual attention. Second, we aimed to test the combined predictions of MIT and the CMH with regard mental effort. Specifically, we hypothesized that objective markers of effort will reflect investment of attention, again peaking during the matched condition. However, subjective reports were predicted to dissociate from psychophysiology, showing limited effort during easy and matched conditions but high effort in the hard task (see Figure 1). Finally, we hypothesized that, contrary to association studies closely linking flow and performance, performance will be best in the easy condition and worst in the hard condition, with reported fluency of performance exhibiting the same pattern.