David Papineau: Physicalism | Who Shaves the Barber? #38

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David Papineau

Most contemporary philosophers call themselves “naturalists” or “physicalists”. But what do these labels really mean? What do they commit us to?

Philosopher David Papineau first puts it negatively: physicalists deny the existence of the supernatural, or of “anything spooky”. More specifically, only those things that play a causal role in the spatiotemporal world exist. And, modern physics tells us, only the physical plays such a causal role. For this reason, “abstract objects” that don’t themselves affect the physical world, such as numbers, should not be said to exist.

For much of the interview, Papineau runs through a “causal argument” to show that consciousness is physical. The argument begins with the premise that mental states have physical effects (for example, my experience of pain causes me to cry out). It also assumes that physical effects have only physical causes and that events aren’t systematically overdetermined (caused by two things at once, like a man killed by a gunshot and a bolt of lightning at once). If this is all true, it follows that mental states must themselves be physical. Papineau runs through possible ways out of this causal argument, including epiphenomenalism. In the process, he runs through a brief history of modern physics and how we came to discover that all physical effects have physical causes. He concludes with an exploration of panpsychism and “Russellian monism“, views that attempt to accept the causal argument but deny that consciousness is therefore strictly physical.…

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Jim Slagle: Epistemological Skyhook, Pt. 1: Plantinga | Who Shaves the Barber? #4

naturalized epistemology
Alvin Plantinga

Episode 4: Jim Slagle’s Epistemological Skyhook, Part 1: Plantinga

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In this interview with epistemologist Jim Slagle, we discuss the Epistemological Skyhook. That is, the argument that certain philosophical positions (such as naturalism and determinism) give us a reason to believe in skepticism, which in turn, gives us a reason to doubt the reasoning that got us to the position in the first place. If the argument is correct, then while it is possible that naturalism or determinism might be true, it is impossible for us to believe in them. In this first part of our two-part discussion, we focus on Alvin Plantinga’s version of the argument.

Audio

Video

Next week: The Epistemological Skyhook w/ Prof. Jim Slagle, Part 2: Skepticism, Theism, Mind
Special thanks for Jackie Blum for the podcast art, and The Tin Box for the theme music.

Topics discussed

00:20 – Determinism v. Naturalism Skyhook arguments
10:46 – Externalist epistemology
14:30 – Externalism as a way out for the determinist
18:57 – Self-reference
20:38 – Humean loop
25:25 – Introducing Plantinga
29:17 – Naturalized epistemology
34:15 – Problem of evil
37:07 – Plantinga’s Skyhook
40:55 – Does evolution select for truth?
49:34 – Language, truth, and reality
1:02:03 – Plantinga and the Humean loop
1:05:22 – Fallible foundationalism
1:11:20 – Theism and properly basic beliefs
1:15:41 – Freudian and Marxist Skyhooks
1:20:13 – Compatibilist objection

Sources

The Epistemological Skyhook: Determinism, Naturalism, and Self-Defeat by Jim Slagle…

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The Epistemological Skyhook

“It’s raining, but I don’t believe it.”

That sentence – called “Moore’s problem,” after its creator G.E. Moore – is interesting because it is a case of something which can be true and yet is impossible to believe. It’s perfectly possible for it to be raining and for me not to believe that it is raining. In fact, it’s happened many times. Yet, I can never believe it as it is happening.

Moore’s problem is not a very serious one. Fully accounting for it is a tricky logical exercise, but it is obvious that there is no real problem. You can’t both believe that it’s raining and believe that you don’t believe that it’s raining. Beliefs just don’t work that way.

Moore’s problem points to a broader issue, however: philosophical positions that can be true but cannot be believed.

Consider Freudianism: the belief that it is our primal, unconscious desires that govern our rationality. If this is, in fact, true, then whatever reasoning we used in order to reach the conclusion of Freudianism must have been an expression of our primal, unconscious desires. This means we have no reason to trust that reasoning in the first place. Our belief in Freudianism undercuts itself.

Or Marxism: the belief that class superstructures govern our rationality. If this is true, then whatever reasoning we use to come to Marxism is an expression of whatever class superstructures we are governed by. We have no reason to think that reasoning reliable. As with Freudianism, belief in Marxism becomes self-defeating.…

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