The mark of the mental is its intensionality (with an ‘s’); that’s to say that mental states have content; they are typically about things. And (with caveats presently to be considered) only what is mental has content. It’s thus unsurprising that considerations about content are most of what drives intuitions about what’s mental. For example, Clark (and Heidegger) notwithstanding, tools – even very clever tools like iPhones – aren’t parts of minds. Nothing happens in your mind when your iPhone rings (unless, of course, you happen to hear it do so). That’s not, however, because iPhones are ‘external’, it’s because iPhones don’t, literally and unmetaphorically, have contents. But what about an iPhone’s ringing? That means something; it means that someone is calling. And it happens on the outside by anybody’s standard. And similarly, what about Otto’s notebook? It has lots of content (it contains, for example, the phone numbers of lots of his friends); and it’s about something – it’s about, for example, his friends’ phone numbers. And also, come to think of it, what about iPhones that have had numbers programmed in? So, even if shovels and the like can’t be parts of minds, how does insisting on the intensionality of the mental rule out notebooks and iPhones?

¶ 7:41 AM