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Rhetoric Origins & Devices. Rhetoric Aristotle (384-322 BC) student of Plato is considered the father of the modern study of rhetoric The art of speaking.

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Presentation on theme: "Rhetoric Origins & Devices. Rhetoric Aristotle (384-322 BC) student of Plato is considered the father of the modern study of rhetoric The art of speaking."— Presentation transcript:

1 Rhetoric Origins & Devices

2 Rhetoric Aristotle ( BC) student of Plato is considered the father of the modern study of rhetoric The art of speaking or writing effectively The study of writing or speaking as a means of communication or persuasion

3 The rhetorical triangle/pyramid Logos – appeal to logic Pathos – appeal to emotions Ethos – appeal to ethics Logos Pathos Ethos

4 Reasoning Inductive reasoning –From specific to general –Circumstantial / doubt Deductive reasoning –From general to specific –Factual/certainty

5 Deductive reasoning Deductive arguments are supposed to be water-tight. Good deductive argument – both premises are true and conclusion must be true – there is certainty The classic example of a deductively valid argument is: (1) All men are mortal. (2) Socrates is a man. Therefore: (3) Socrates is mortal.

6 Inductive Reasoning Inductive arguments neednt be as rigorous as deductive arguments in order to be good arguments. Good inductive argument – if premises are true, conclusion may or may not be true, but it is likely – there is doubt

7 Logical Fallacies A logical fallacy is, roughly speaking, an error of reasoning. When someone adopts a position, or tries to persuade someone else to adopt a position, based on a bad piece of reasoning, they commit a fallacy.

8 Ad hominem /Personal Attack …a general category of fallacies in which a claim or argument is rejected on the basis of some irrelevant fact about the author of or the person presenting the claim or argument. 1. Person A makes claim X. 2. Person B makes an attack on person A. 3. Therefore A's claim is false. Ex. Su Doctor Samuels says that the the vitamins are good for you. James Doctor Samuels was arrested for speeding. He doesnt know what is good for you. Ex. "That claim cannot be true. Dave believes it, and we know how morally repulsive he is. "Bill claims that Jane would be a good treasurer. However I find Bill's behavior offensive, so I'm not going to vote for Jill."

9 The Crucible and Ad Hominem/Personal Attack Mary Warren claims that all of the behaviors of Abigail and the rest of the girls are a pretense; they are fake. She indicates that she too was a part of the hoax. Abigail and the others claim that she is attacking them by sending out her spirit to claw and torture them. The courts do not believe Marry Warrens testimony. Mary Warren accuses Goody Good of being a shiftless vagrant who has practiced witchcraft on her.

10 Tu quoque The tu quoque fallacy is committed when a persons claim is considered false because it is inconsistent with that persons words or actions. "He cannot accuse me of libel because he was just successfully sued for libel. Person 1: It should be illegal to make clothing out of animals. Person 2: But, you are wearing a leather jacket.

11 The Crucible and Tu Quoque John Proctor claims that Abigail and the girls are faking their claims, that they are not the voice of God. Cheever points out that John Proctor does not always go to church and plows on Sunday. This casts doubt on Proctors judgment of the girls actions/words.

12 Ad baculum or Appeal to fear 1. Y is presented (a claim that is intended to produce fear). 2. Therefore claim X is true (a claim that is generally, but need not be, related to Y in some manner). This line of "reasoning" is fallacious because creating fear in people does not constitute evidence for a claim. Ex: You know Sarah. I need to pass class, and you need to maintain your good reputation. If you give me the answers to the test, I wont tell others that you stole money from the class fundraiser. But, thats not true. Who do you think they will believe?

13 The Crucible and Appeal to Fear Mary Warren warns Elizabeth and John to be careful of their actions and words toward her. She indicates that she has a personal connection with the courts and the officers of the courts. She also points out that she saved Elizabeths life by standing up for her.

14 Post hoc (ergo propter hoc) 1. A occurs before B. 2. Therefore A is the cause of B. The Post Hoc fallacy derives its name from the Latin phrase "Post hoc, ergo propter hoc." This has been traditionally interpreted as "After this, therefore because of this. Ex: Sam fell on the stairs before class. His bruised knee is from the fall.

15 The Crucible and Post Hoc The villagers of Andover suffered the symptoms of witchcraft. The the villagers of Salem begin to suffer strange symptoms. They must be affected by witchcraft. Elizabeth Proctor had a doll in court, therefore the pin stuck in Abigails stomach must be from Elizabeths poppet.

16 Slippery slope The Slippery Slope is a fallacy in which a person asserts that some event must inevitably follow from another without any argument for the inevitability of the event in question. Event X has occurred (or will or might occur). 1. Therefore event Y will inevitably happen. This sort of "reasoning" is fallacious because there is no reason to believe that one event must inevitably follow from another without an argument for such a claim. 1. "You can never give anyone a break. If you do, they'll walk all over you."

17 The Crucible and Slippery Slope One person has been accused of witchcraft, therefore all of his or her acquaintances are likely to also be witches.

18 False dilemma A False Dilemma is a fallacy in which a person uses the following pattern of "reasoning": 1. Either claim X is true or claim Y is true (when X and Y could both be false). 2. Claim Y is false. 3. Therefore claim X is true. This line of "reasoning" is fallacious because if both claims could be false, then it cannot be inferred that one is true because the other is false. That this is the case is made clear by the following example: 1. Either 1+1=4 or 1+1= It is not the case that 1+1=4. 3. Therefore 1+1=12.

19 The Crucible and False Dilemma Either the girls danced, chanted and drank blood and are witches or they are not witches. The girls drank, chanted, and drank blood. They must be witches.

20 False authority An Appeal to Authority is a fallacy with the following form: 1. Person A is (claimed to be) an authority on subject S. 2. Person A makes claim C about subject S. 3. Therefore, C is true. This fallacy is committed when the person in question is not a legitimate authority on the subject. More formally, if person A is not qualified to make reliable claims in subject S, then the argument will be fallacious. 1. Dave and Kintaro are arguing about Stalin's reign in the Soviet Union. Stalin was a great leader while Kintaro disagrees with him. Kintaro: "I don't see how you can consider Stalin to be a great leader. He killed millions of his own people, he crippled the Soviet economy, kept most of the people in fear and laid the foundations for the violence that is occurring in much of Eastern Europe." Dave: "Yeah, well you say that. However, I have a book at home that says that Stalin was acting in the best interest of the people. The millions that were killed were vicious enemies of the state and they had to be killed to protect the rest of the peaceful citizens. This book lays it all out, so it has to be true."

21 The Crucible and False Authority Hale is supposed to be an authority on witches and witchcraft. Hale signs papers indicating that women are witches. Therefore, the women are indeed witches.

22 Source Cited Labossiere, Michael C. The Nizkor Project, Jul

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