we revisit and directly address previous reservations regarding the use of the SL, including concerns that SL measures represent activations at a different spatial scale than surface potentials. However, it is beyond the scope of this paper to detail the neurophysiological and neuroanatomical underpinnings of EEG phenomena recorded at scalp, which are covered in depth elsewhere (e.g., Nunez, 1981; Nunez and Srinivasan, 2006), or how patterns of neuronal activation are differentially represented by scalp or intracranial Laplacian estimates (Tenke and Kayser, 2012).
