The main development or change in how Descartes understands the mind from Meditations on First Philosophyto Passions of the Soul is that in this latter book his theory makes it possible for the body to act without the mind. In fact, I argue, he doesn’t leave the mind any way to affect the body at all even though he of course wants it to. There are a couple of reasons for this state of affairs. First, as we saw in the first Cartesian Error, he argues that the only thing the mind can do is think, and the body cannot think at all. Then in the Second Error, he argues that emotions aren’t thinking and explains that the human body works in such a way as to be able to start, continue and end emotions and emotion-based behavior. I call this organization, this explanation, an example of half-duplex communication between body and mind, a type of communication I previously said was exemplified by walkie-talkies and text messages. Let’s briefly review why this can’t be a reasonable way to look at how the mind and body interact.
If the mind were like a walkie-talkie, by definition only one end at a time can communicate. So if you had a spider on your leg, what would have to happen for you to get rid of it? First, the body would feel the pressure on your flesh. But for your mind to know the spider was there too would require one of four things, all of which have problems and raise more questions than they answer, (at least for Descartes):
Read the rest at my dissertation blog!
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