&gt; I&#x27;m just pointing out that input is distinct from output; they&#x27;re not the same thing.<p>That&#x27;s obviously true, but that&#x27;s a very different statement than the one you originally made, namely, &quot;Everything you will ever experience is all in your head.&quot;<p>In response to your new statement I will say: I understand what &quot;input&quot; means, but I can&#x27;t imagine what &quot;output&quot; could possibly mean in the context of a discussion on subjective experience.<p>If you mean that whatever combination of neurons fire to produce a subjective experience in response to external stimuli can also be triggered without those external stimuli in some cases, then yes, that is also obviously true.  But that is also a very different claim than &quot;Everything you will ever experience is all in your head.&quot;