Fig. 4.

Rolandic epilepsy subjects produce fewer, but typical, spindles. (A) Left and (B) right hemispheres of a subject with sources (circles) in the inferior Rolandic cortices (blue). The subset of sources in the inferior Rolandic cortices with detected spindles are colored orange, otherwise black. (C) Example recordings from source in the left hemisphere (top) and the right hemisphere (bottom) with detected spindles in orange. Arrows between sources within each cortex indicate intra-hemispheric coherence, and arrows between sources from the left to the right cortices indicate inter-hemispheric coherence. Below the recordings from each hemisphere is the corresponding spindle indicator function that contains ones if at least one source is exhibiting a spindle at that moment in time and is used to compute the bilateral synchrony of spindles. (D-H) Spindle characteristics sigma power (D), duration (E), intra-hemispheric sigma band coherence (F), inter-hemispheric sigma band coherence (G), and bilateral synchrony (H). We find evidence of a difference between active and control subjects only for the bilateral synchrony (asterisks). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)