In this post we will examine some of the various positions taken on the Mind-Body problem. An examination of the Mind-Body problem requires us to determine if the mental realm is different or the same as the physical. For example we might want to say that the mind is totally equivalent with our physical brain, though this position is by no means held by everyone.
Theories about mind can be divided into two distinct varieties. One the one hand there are monist theories which claim that the world consists of one kind stuff or substance. On the other hand their are dualist theories which claim that world consists of two substances: typically the mental and the physical. Monism the theory that the world consists of one fundamental substance comes in four distinct varieties each of which I will briefly outline.
Four Distinct Varieties of Monism
- Idealism or Solipsism, is the idea that the world is completely mental. Idealism claims that there is only one thing to our ontology, namely ideas. Idealism however suffers from a couple of serious problems. Firstly, Idealism seems to have problems in accounting for the persistence of objects. It seems that Idealist is going to struggle to explain how objects persist during periods of time when they are unperceived. Secondly, experience appears to involuntary, what we experience appears to be caused by something beyond ourselves (a physical world perhaps?). Historically Berkeley is the best known proponent of Idealism and sought to avoid some of the apparent problems of Idealism by bringing God into the picture. The Solipsist extends this and claims that the whole of existence is constituted by their Ideas, everything is taken to be an Idea within their own mind.
- Physicalism: the physicalist makes the claim that there is only one kind of stuff and that stuff is of the physical kind. The Physicalist project requires that everything must at least be explained or reduced to the physical. Typically this has led physicalists to reduce mental properties and events to brain states or properties of the physical brain. For example a physicalist may claim that being in pain will ultimately be shown to be nothing more than being in a particular relevant brain state.
- Neutral Monism holds that reality is neither mental or physical as we understand the terms but really consists of one kind other stuff perhaps encompassing both the mental and the physical.
- Mental and Physical Monism, reality is essentially a single substance, but at the same time is both mental and physical. This leads to a kind of Panpsychism where the fundamental building blocks of the universe are to be taken both experiential and physical. Adopting such a position could lead us to hold that inanimate objects such as rocks may have some kind of conscious experience. One example of a prominent modern panpsychist would be the University of Reading's Galen Strawson.
Dualism
The major alternative to the forms of Monism is to adopt Dualism. The best known form of Dualism is substance dualism also commonly known as Cartesian Dualism due to the fact it originates in the work of the French Philosopher Rene Descartes. It this Substance Dualism that the rest of this post will most prominently focus on due to it's significant influence and historical importance. However it is important to note that their are other forms of Dualism. Substance or Cartesian Dualism isn't the only Dualist show in town.
Unsurprisingly, Cartesian Dualism posits two different kinds of substance material bodies and thinking things. Descartes held that there is real distinction between minds and bodies, he felt that they were fundamentally different kinds of thing. Descartes differentiated between Res Cogitans- a thinking and Res Extensa an extended physical thing. What constitutes a person is a matter of res cogitans not Res Extensa. Descartes offers up two different arguments to this effect, the argument from doubt and the argument from clear and distinct ideas.