The metal disk and the coin are extensionally equivalent.
Let’s go over the difference between extension and intension. The intension of the are the attributes that are applicable to the individual; that it is nickel alloy, is embossed with a portrait of the king, was stamped at the Canberra Mint, is in my pocket, and so on. The extension is… this; the very item. The one extension may, then, have various differing descriptions of its intensional characteristics. This amounts to a constipated way of saying, for example, that that fellow, Banno, may be described in various different ways.
The idea in Davidson then is that we can best account for actions by individuating them; since in so doing, we allow for quantification; there was an event which was a buttering of toast; that event was done by Jones; That event was done slowly; that event was done deliberately; and so on.
Perhaps he buttered the toast because he had a craving for buttered toast; a pro-attitude; together with a belief that the way to satisfy that pro-attitude was to butter the toast. Together these form a reason for Jones buttering the toast.
The onset of that pro-attitude and belief, the onset of that reason, was a mental event.
That mental event satisfies the explanation for the buttering: “Jones buttered the toast because he was craving buttered toast, together with a belief that buttering the toast would satisfy that craving”.
This gives us the cause of the event.
This, together with various if’s and but’s, is the sort of thing Davidson has in mind in Actions, Reasons and Causes.
He also argued that the mental event involved must be the same as (token identical to; the same individual) some unspecified physical event, in order to count as a cause, in the contended view that a cause requires a universal rule.
We might, following Anscombe, reject the need for a universal law here. We might nevertheless hypothesise that there are physical descriptions of the movement of Jones hands and arms, together with the coincident working of his brain, that are the same as (token identical to…) the onset of the reason and the buttering of the toast.
In the subsequent paper Mental Events, Davidson said more about the nature of the relation between the physical description of the onset of the reason, and the description of that reason in terms of “I wanted buttered toast”: that every mental event is token-identical to some physical event, but there is no way of systematically translating mental descriptions into physical ones that would preserve the truth of strict laws linking them. that is “Anomalous Monism”.
For our purposes here, this is a seperate issue, in need of some detailed stocktaking. For now, we might agree that Davidson presents an excellent case for reasons counting as causes.
