<p><b>Thalamus</b></p><p>I also look at the posterior alpha peak which is the rhythm responding to eye open/close, not just 8-12. The thalamus makes activity from 3 to 20 Hz... so it can be mistaken for 'theta' easily..&nbsp; The thalamus also becomes rhythmic with ACH, with this provided by the 'reticular nucleus of the thalamus' (a thin "skin" surrounding the rest of the thalamus).</p>