Why would it follow that less filters would infer less brain activity? - even partially. Surley any cleansing&#x2F;removing of the filters would excite all the brain, as it reacts to new stimuli.<p>To quote Huxley &quot;If the doors of perception were cleansed every thing would appear to man as it is, infinite. For man has closed himself up, till he sees all things thro&#x27; narrow chinks of his cavern.&quot;