&gt; <i>Surley any cleansing&#x2F;removing of the filters would excite all the brain, as it reacts to new stimuli.</i><p>&quot;Filter&quot; in this case is just an analogy, and not necessarily a good one.  We don&#x27;t know the nature of consciousness and how it maps to brain activity, so it&#x27;s not appropriate to assume that what is perceived as removing a &quot;filter&quot; is increasing stimuli, it&#x27;s just processing it differently in some way.