Karl Popper & The Philosophy of Science. What Makes a Theory Scientific?
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1 Karl Popper & The Philosophy of Science What Makes a Theory Scientific?
2 Philosophy of Science The Philosophy of Science deals with many issues, including: The relationship of scientific statements to other kinds of statements. The status of scientific claims. Should the entities described by science (e.g. subatomic particles) be understood as real, or merely explanatory posits? Whether science can provide knowledge.
3 Karl Popper Austrian/Jewish Fled Austria for New Zealand in 1937 to escape the Nazis. Famous for his Philosophy of Science and his criticisms of totalitarian government.
4 Popper s Question Which theories are Scientific? Take two theories about medicine: 1. Modern Medical Science. 2. Lee s theory of Magical Medicine. What makes (1) scientific and (2) not?
5 Answer 1. Confirmation The modern theory of medicine is confirmed by the evidence, but Lee s theory of Magical Medicine is not. But I can make my theory of Magical Medicine completely consistent with the evidence (like a conspiracy theory). e.g. I ascribe different maladies to the influences of different evil spirits. So confirmation does not seem to do it.
6 Answer 2. Explanatory Power Modern medicine is better than Magic because it enables us to explain what is happening in cases of illness. But so does Magic: people are possessed by evil spirits. Why is the explanation offered by modern medicine a better one than that offered by Magic?
7 Answer 3. Useful Modern Medical Science is better than Magical Medicine because it enables us to predict the future in useful ways. But a theory need not be true or even scientific to do this. e.g. I believe that spirits cause the seasons. It depends on what people consider useful.
8 Answer 4. Falsifiability Popper: in order to be considered a candidate scientific theory, a theory must be capable of being falsified. That is, there must be possible events that would cause us to abandon it. This is not the case with Magic or conspiracy theories because no matter what the evidence, they can be made consistent with it.
9 Observational Consequences Statements of a scientific theory have observational consequences. We can express these in conditionals. e.g. If theory X is true, then Y must occur. This means that if Y doesn t occur then theory X must be false.
10 No Confirmation Popper: a scientific theory can never be proven to be true (confirmed), it can only ever be proven false. Our current scientific theory is a good one because it has not yet been proven false, despite being subjected to a barrage of observational tests. The more tests, the fitter the theory.
11 If scientific theories must be falsifiable, then it turns out that Magic cannot be a science, because it can t ever be proven false. This is also what distinguishes conspiracy theories from other theories. Similarly with beliefs in beings that no-one could ever detect by any means. There might indeed be such beings, but the theory that claims their existence is not a scientific theory because it is not testable.
12 Induction Again The Problem of Induction claimed that we had no reason to believe in the uniformity of nature over time and space. Hence we have no reason to regard science as more than speculation. Popper: To imagine that Science could ever prove the uniformity of nature is to misunderstand science. Science can t prove anything. It merely consists of falsifiable theories that have not yet been falsified.
13 Popper: Hume is right that we cannot prove any theory to be absolutely correct. Popper: But it is the case that we can absolutely prove that a theory is incorrect (by showing it is falsified). Popper: Science does not in fact make use of induction. It is conjectural. We just hang on to the theories that survive all the various slings and arrows we throw at them.
14 Has Popper solved the problem? Which sciences pass his test of falsifiability? Popper thought that Freud s Psychoanalysis did not. What does it mean for the evolution vs Intelligent Design debate?
15 Against Falsificationism Kitcher: take Newton s laws + the theory of gravitation. This theory predicts that an apple released from a tree will fall and hit the ground. If that doesn t happen, we must reject the theory (this is required by Popper). But it isn t clear that we would have to.
16 For example: we could just suppose that there were some other factors at work. If that is the case then Newton s theory is unfalsifiable and hence not scientific. Kitcher: we could state that Newton s theory contains a series of supplementary assumptions that would cover all eventualities and keep it falsifiable. But anyone could do this for any theory, so it doesn t work.
17 Example The core claims of Newton s theory are not falsifiable by themselves, but only with supplementary claims. Similarly, I can claim that Magic is not falsifiable by itself, but can be made so by the addition of supplementary claims that entail observational consequences. e.g. If Magic is true, then grass is green and animals exist, etc.
18 The moral of this story is that once you have to add observational consequences to a theory, you can do this for any theory, and we are back where we started with no distinction between science and the rest.
19 A Response: Holism Popper assumed that individual claims or small groups of claims (like Newton s laws) have observational consequences. But what if individual scientific claims do not confront the evidence one by one, but in large groups? This is called Holism.
20 The Duhem/Quine Thesis Holism abandons the idea that we can isolate precisely where a theory has gone wrong. If a theory faces contrary evidence, there is always a choice about which statements of the theory which must be revised. More than one theory can fit the facts. We just tend to make the easiest revisions.
21 An Atomist view of Falsification Claims made by the Theory Falsifying Evidence In this case we know exactly which claim was wrong
22 A Holist view of Falsification Claims made by the Theory Falsifying Evidence Any claim may be singled out as the wrong one.
23 Example Kitcher: Newtonian mechanics was falsified by the orbit of Uranus. Scientists had a choice: propose some unseen influence and keep the theory, or abandon it. They chose to keep it in defiance of their observations. Why? Because it was simply the most useful theory they had.
24 Kitcher: there are a variety of reasons why some revisions are better than others. Some revisions are testable independently of the theory (like the existence of Neptune). Some revisions are more unified than others (more coherent). Some revisions are more useful in getting us to ask new questions.
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