Supervenience | Wikipedia audio article
Channel: wikipedia tts
Date: 15/12/2018

This is an audio version of the Wikipedia Article:
Supervenience


00:02:59 1 History
00:04:51 2 Definitions
00:08:37 3 Varieties of supervenience
00:12:18 4 Examples of supervenient properties
00:12:29 4.1 Value properties
00:13:29 4.2 Mental properties
00:15:45 4.3 Computational properties
00:16:41 4.4 Biological properties
00:18:08 5 Arguments against supervenience-based formulations of physicalism
00:18:39 5.1 Epiphenomenal ectoplasm
00:19:39 5.2 The lone ammonium molecule problem
00:20:28 5.3 Modal status problem
00:21:19 5.4 Problem of necessary beings
00:22:05 6 See also
00:22:21 7 Notes
00:22:29 8 External links



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"The only true wisdom is in knowing you know nothing."
- Socrates



SUMMARY
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In philosophy, supervenience refers to a relation between sets of properties or sets of facts. X is said to supervene on Y if and only if some difference in Y is necessary for any difference in X to be possible. Equivalently, X is said to supervene on Y if and only if X cannot vary unless Y varies. Here are some examples. 

Whether there is a table in the living room supervenes on the positions of molecules in the living room.
The truth value of (A) supervenes on the truth value of (¬A).
Molecular properties supervene on atomic properties.
The quality of Nixon’s moral character supervenes on how he is disposed to act.A table could not be removed from a room without the positions of molecules in that room changing. In a logic with double negation elimination, the truth value of (A) could not change without the truth value of (¬A) changing. Facts about the properties of a molecule could not change without facts about its atomic constituents changing. And facts about the quality of Nixon's moral character could not change without facts about how he has acted, or about how he would be disposed to act, changing. 
Supervenience is of interest to philosophers because it differs from other nearby relations, for example entailment. It may be possible for some A to supervene on some B without being entailed by B. In such cases it may seem puzzling why A should supervene on B and equivalently why changes in A should require changes in B. Two important applications of supervenience involve cases like this. One of these is the supervenience of mental properties (like the sensation of pain) on physical properties (like the firing of ‘pain neurons’). A second is the supervenience of normative facts (facts about how things ought to be) on natural facts (facts about how things are).
These applications are elaborated below. But an illustrative note bears adding here. It is sometimes claimed (and has been claimed in earlier versions of this entry) that what is at issue in these problems is the supervenience claim itself. For example, it has been claimed that what is at issue with respect to the mind-body problem is whether mental phenomena do in fact supervene on physical phenomena. This is incorrect. It is by and large agreed that some form of supervenience holds in these cases: Pain happens when the appropriate neurons fire. The disagreement is over why this is so. Materialists claim that we observe supervenience because the neural phenomena entail the mental phenomena, while dualists deny this. The dualist’s challenge is to explain supervenience without entailment. 
The problem is similar with respect to the supervenience of normative facts on natural facts. It is agreed that facts about how persons ought to act are not entailed by natural facts but cannot vary unless natural facts vary, and this rigid binding without entailment might seem puzzling. The possibility of "supervenience without entailment" or "supervenience without reduction" is contested territory among philosophers.