A new cap on the Blog

ANT has done it again: This new Wavecap is really worth checking out !! Much better and evenly spacial covering with special focus on frontal fields/sources. In cooperation with Duke. Through a very productive cooperation with the Center for Cognitive Neuroscience at Duke University, notably the group of Prof. Marty Woldorff, we have been able to add a small family of caps that are designed according to an "equidistant hexagonal" layout, i.e.: The WaveGuard Duke cap "equidistant hexagonal" layout. This electrode configuration also covers the head more completely, including many electrodes up to about 30 degrees below the FpZ-T7-Oz-T8 equator, as recommended in the Picton et al. ERP Guidelines (2000) and by Steve Luck in his ERP Handbook (2005). All "Duke" caps include EEG electrodes at the outer canthi of the eyes, which can also be used to compute a bipolar HEOG derivation. The family of caps includes a 32 channel, 64 channel and a 128 channel version. Because of the unique labeling scheme (for each cap different electrode names), your data can be properly plotted automatically in ASA. This new "Duke" naming convention is available as part of the technical documentation of each cap type (available on our web-site). Major benefits of the equidistant layout and the lower coverage of these caps include potential source localization improvements (e.g. improved capturing of lower fronto-temporal and occipital-temporal source activity), improved accuracy of EEG/ERP scalp distribution plots (less interpolation inaccuracies), and an increased likelihood to capture clinically relevant information even with lower electrode density (even the 32 and 64 channel caps have an extended spatial coverage). An additional effort will be made by the Duke group to further publish on the rationale for using this cap layout in ERP research.