Visible and Invisible Structures in the EEG Signal It probably would be useful to talk about visible and invisible structures. The cortex, the hippocampus (inside each temporal lobe) and the cingulate are all composed with pyramidal neurons, so they produce a signal that appears in the EEG.   Most of the primary sub-cortical players (thalamus, hypothalamus, amygdala, basal ganglia, etc.) are composed primarily of stellate neurons, which don’t produce a visible EEG signal. Obviously most of what we see in […]