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Today I came across this rather lengthy article that instantly hit me as sticky material. It was written by Dr. Steven Novella, president of the New England Skeptical Society. Its an all purpose guide to how to formulate a proper argument, and it lists all of the logical fallacies and explains them better than any place I've seen.
Here are a few key portions:
The section on logical fallacies is the bit I think should be a sticky. It will definitely be one of my references. Heres a bit:
And then he goes on to list and explain them. These are my favorites:
Might be a bit too skeptical for some, but does anyone see any problems (errors in his logic) with this list?
Here are a few key portions:
If two people doing the same math problem come up with different answers, how should they respond? Should they each defend their answer at all costs. Or, should they examine each other’s solution to see if one, or both, might contain an error, and then resolve the error to see what the correct answer is?...
...In order for a conclusion to be considered valid all the premises of an argument must be true, and the logical connection must be valid. I use the term “valid” here specifically to refer to such conclusions, because a conclusion may still be “true” even if it is not valid. This is because it is possible to use wrong information, or faulty logic to reach a conclusion that happens to be true. An invalid argument does not necessarily prove the conclusion false. Demonstrating that an argument is not valid, however, removes it as support for the truth of the conclusion.
Breaking down an argument into its components is a very useful exercise, for it enables us to examine both our own arguments and those of others and critically analyze them for validity. This is an excellent way of sharpening one’s thinking, avoiding biases, and making effective arguments...
...Another type of premise error occurs when one or more premise is an unwarranted assumption. The premise may or may not be true, but it has not been established sufficiently to serve as a premise for an argument. Identifying all the assumptions upon which an argument is dependent is often the most critical step in analyzing an argument. Frequently, different conclusions are arrived at because of differing assumptions.
Often people will choose the assumptions that best fit the conclusion they prefer. In fact, psychological experiments show that most people start with conclusions they desire, then reverse engineer arguments to support them – a process called rationalization....
The section on logical fallacies is the bit I think should be a sticky. It will definitely be one of my references. Heres a bit:
Logical Fallacies
Even when all of the premises of an argument are reliably true, the argument may still be invalid if the logic employed is not legitimate – a so called logical fallacy. The human brain is a marvelous machine with capabilities that, in some ways, still outperform the most powerful of super computers. Our brains, however, do not appear to have evolved specifically for precise logic. There are many common logical pitfalls that our minds tend to fall into, unless we are consciously aware of these pitfalls and make efforts to avoid them.
Because, as stated above, there is a tendency to start with desired conclusions and then construct arguments to support them, many people will happily draw upon logical fallacies to make their arguments. In fact, if a conclusion is not true one must either employ a false premise or a logical fallacy in order to construct an argument that leads to that conclusion. Remember, a valid argument cannot lead to a false conclusion. So in order to avoid using logical fallacies to construct invalid arguments, we need to understand how to identify fallacious logic.
And then he goes on to list and explain them. These are my favorites:
Ad ignorantum
The argument from ignorance basically states that a specific belief is true because we don't know that it isn't true. Defenders of extrasensory perception, for example, will often overemphasize how much we do not know about the human brain. It is therefore possible, they argue, that the brain may be capable of transmitting signals at a distance.
UFO proponents are probably the most frequent violators of this fallacy. Almost all UFO eyewitness evidence is ultimately an argument from ignorance – lights or objects sighted in the sky are unknown, and therefore they are alien spacecraft.
Intelligent design is almost entirely based upon this fallacy. The core argument for intelligent design is that there are biological structures that have not been fully explained by evolutionary theory, therefore a powerful intelligent designer must have created them.
The Moving Goalpost
A method of denial - arbitrarily moving the criteria for "proof" or acceptance out of range of whatever evidence currently exists. Creationists are most famous for this fallacy. In Darwin’s time they argued that in order for evolution to be true there would need to be a method of inheritance that allowed for new variation to persist and propagate, rather than merely become diluted in the larger population. Mendel’s discovery of “genes” fit the bill. They then argued that if evolution were true there should be many transitional fossils, but no number of transitional fossil discoveries seems to be enough to satisfy them. Intelligent Designers now argue that evolution cannot explain the appearance of biochemical pathways and microscopic structures – but as these pathways and structures are rapidly being explained they simply continue to move the goalpost further and further back.
Might be a bit too skeptical for some, but does anyone see any problems (errors in his logic) with this list?