standard and rare non-target stimuli, and to press a response key as quickly as possible to target stimuli. Each subject was shown examples of the various stimuli during a short practice session before proceeding with the task. The paradigm was similar to that used by Jones et al. (2006) and Rangaswamy et al. (2007), with differences being that those studies presented stimuli for only 60 ms and had longer and fixed ISIs of 1600 ms (Jones et al., 2006) and 1625 ms (Rangaswamy et al., 2007).
