Figure 2. Task overview and event latency testing. A, B) For the Multi Source Interference Task (MSIT), participants are asked to report the one number that is different from the other two using a button box corresponding to the numbers 1, 2, and 3. Trials consist of a fixation period followed by the stimulus. In congruent trials (A), the distractor numbers are zeros and in incongruent trials (B) distractors are other valid numbers. C) Start timing for the fixation and stimulus events were saved in three streams: photodiode pulses, numeric event codes, and timestamps in JavaScript Object Notation (JSON). D-I) Timing latencies between the three streams (D/G: event codes – JSON, E/H: photodiode – JSON, F/I: event codes – photodiode) using BrainVision (D/E/F) and Open Ephys (G/H/I) were estimated by computing the difference in timing for each event. Normal distributions (black) were fit to the latency data and points within the 95% range are indicated in blue and those outside the range are indicated in orange. RT = response time.