Abstract: BACKGROUND: Visual neuroscience experiments and Brain–Computer Interface (BCI) control often require strict timings in a millisecond scale. As most experiments are performed using a personal computer (PC), the latencies that are introduced by the setup should be taken into account and be corrected. As a standard computer monitor uses a rastering to update each line of the image sequentially, this causes a monitor raster latency which depends on the position, on the monitor and the refresh rate. NEW METHOD: We technically measured the raster latencies of different monitors and present the effects on visual evoked potentials (VEPs) and event-related potentials (ERPs). Additionally we present a method for correcting the monitor raster latency and analyzed the performance difference of a code-modulated VEP BCI speller by correcting the latency. COMPARISON WITH EXISTING METHODS: There are currently no other methods validating the effects of monitor raster latency on VEPs and ERPs. RESULTS: The timings of VEPs and ERPs are directly affected by the raster latency. Furthermore, correcting the raster latency resulted in a significant reduction of the target prediction error from 7.98% to 4.61% and also in a more reliable classification of targets by significantly increasing the distance between the most probable and the second most probable target by 18.23%.

@article{SWWM012018, author = {Nagel, Sebastian and Dreher, Werner and Rosenstiel, Wolfgang and Spüler, Martin}, title = {The effect of monitor raster latency on VEPs, ERPs and Brain-Computer Interface performance}, journal = {Journal of Neuroscience Methods}, year = {2018}, month = {jan}, volume = {295}, pages = {45-50}, doi = {10.1016/j.jneumeth.2017.11.018}, month_numeric = {1} }

@inproceedings{WHGW1999, author = {Dreher, Werner and Martin, H. G. and Rosenstiel, Wolfgang}, title = {Das Weaver-II-Board als neue HW/SW-Codesign Plattform}, booktitle = {SDA }, year = {1999} }