For the last several years we have focused on interhemispheric EEG training including prefrontal Fp1-Fp2. Interhemispheric training influenced the activation of both left and right prefrontal areas and the coordination of activity between them. More recently we have moved back to left and right-side training separately in some cases. This brings us back to the issue of which functions we might impact with left-side versus right-side training