"Logic is the anatomy of thought."
– John Locke

"Logos" is the appeal to logic. Logos isn't logic like the formal logic in math, philosophy, or even computer science; it is the consistency and clarity of an argument as well as the logic of evidence and reasons.

In formal logic, in abstraction, the following is the case: if A is true and B is true and A is an instance of B, then the repercussions of B will always be true. The problem, however, is that this kind of logic doesn't work for real-life situations. This is where argument comes into play. Formal logic would say that speeding, for example, is a violation of traffic laws. A repercussion of violating a traffic law is a ticket; therefore, every person who speeds gets a ticket.

By now you know that all arguments operate according to an internal logic. No matter which of the four rhetorical appeals the author uses, her thesis will succeed or fail based on the soundness of her argument. In classical logic, an argument is sound only if all of its premises are true and the argument is valid. And an argument is valid only if its conclusion follows logically from the combination of its premises. For example, Plato’s classic syllogism, “All men are mortal; Socrates is a man: therefore, Socrates is mortal” is both valid and sound. Its premises are true, and the conclusion is undeniable given an understanding of the definitions of the terms.

I've always wondered why candidates have to "approve this message"; I mean, if President Obama is on camera talking about himself, then can't I assume he approves the message? Why does he have to state that he approves it at the end?

There's certainly a law that governs what must be said at the end of a political advertisement, or else President Obama wouldn't say exactly the same thing as every other politician at the end of an ad, but there's also an element of persuasion at work here. 

We need to be aware of how advertisers appeal to us, and we should think critically about the persuasive messages we encounter to ensure we are savvy, not passive, consumers. Because consumers purchase products with which they identify, it is important to examine the subtexts of advertisements as well as the role those subtexts play in determining what products men and women choose to associate with their personal identities.

  • Ad Hominem (Argument to the Person): Attacking the person instead of the argument. For example, "You say I shouldn't drink so much, but you drink every day." The validity of the argument (drink less) can't be based on the behavior of the person making the argument. Instead, the validity of the argument should be evaluated on its own terms—separate from the person making the claim.

"Fallacious Pathos" was written by Kendra Gayle Lee, Jessica McKee, and Megan McIntyre

  • Argument by Dismissal: Rejecting an idea without providing a reason or explanation for its dismissal. For instance, there is a tendency to cry "socialism" when faced with calls for a single-payer system in the ongoing health care debate. Such a dismissal of the single-payer system may include the observations, "This is America!," or, "You are free to live elsewhere if you prefer." While we do live in the United States and people are free to live wherever they want, neither of these observations actually addresses the argument, either for or against the single-payer system. The observer relies on the simple (and fallacious) dismissal of the opposing viewpoint.

To view the Rhetorical Appeal table, please open the full article.

Typically, the first thing we look for in a photograph is ourselves. Advertisers recognize this fact and use it to their advantage. Because of this, we can learn a lot about a company’s target customer base by observing the people featured in its advertisements.

  • Appeal to Nature: Suggesting a certain behavior or action is normal/right because it is "natural." This is a fallacious argument for two reasons: first, there are multiple, and often competing, ways to define "nature" and "natural." Because there is no one way to define these terms, a writer cannot assume his or her reader thinks of "nature" in the same way he or she does. Second, we cannot assume that "unnatural" is the same as wrong or evil. We (humans) have made lots of amendments to how we live (e.g., wearing clothes, living indoors, farming) with great benefit.

We come across many images on a daily basis, but we rarely stop to think about what those images mean or about how they persuade us. Yet, images have power, which is why we need to understand how to analyze them. When you’re analyzing an image to understand the message it portrays, this is called visual rhetoric. Visual rhetoric is a means of communication that uses images to create meaning or to make an argument.

As a reader, a developing writer, and an informed student and citizen, it is extremely important for you to be able to locate, understand, and critically analyze others’ purposes in communicating information. Being able to identify and articulate the meaning of other writers’ arguments and theses enables you to engage in intelligent, meaningful, and critical knowledge exchanges. Ultimately, regardless of the discipline you choose to participate in, textual analysis—the summary, contextualization, and interpretation of a writer’s effective or ineffective delivery of his or her perspective on a topic, statement of thesis, and development of an argument—will be an invaluable skill.

Two Types of Essays

Your composition professor has given you an assignment, requiring you to write an essay in which you identify your favorite book and explain why you like it best. Later she assigns an essay in which you take a stand either for or against homeschooling.

Both assignments require you to write a paper, yet the essays called for are in two different genres. Thus, you will need to present your views in two different ways.

To what social class do you belong? How do you know? Can others tell by how you talk, dress, and act? By how much money you have? By your level of education? By your occupation? Despite the presumed cultural ideal of social equality in America, key markers such as income and education are often used for social classification.

Advertising executives and marketing experts more than likely hope that we remain oblivious to the underlying messages that ads contain and that we perceive their work purely from entertainment and consumerist perspectives rather than for the purpose of critical assessment.

The website eHow has a page on “How to Freestyle Rap” (“Difficulty: Moderately Challenging”), and I’m trying to figure out what I think about it. On one hand, it seems like it would be against the ethos of an authentic rapper to use a page like this to brush up on freestyle skills. After all, the page is hosted on a corporate website owned by Demand Media, Inc., the same people behind, among other things, a golf site.

 Become proficient at quickly locating useful information via the library and Internet.

As repositories of our collective knowledge, libraries and the Internet host our cultural heritage, the memory of our present and past civilizations. Admittedly, though, the cornucopia of information accessible via the Internet and archived in libraries can be overwhelming, particularly if you are just becoming accustomed to the research process.

Conducting library and Internet research helps you quickly find the information you need. This page provides useful suggestions about how to conduct Boolean searches, for instance, and offers advice about how to identify whether you should begin your research using the Open Web, the Gated Web, or the Hidden Web.

As you learn in “Critical Reading Practices,” an effective argument contains a thesis, supporting claims, and evidence to support those claims. The thesis is the writer’s central argument, or claim, and the supporting claims reinforce the validity of the thesis. When reading another writer’s argument, it is important to be able to distinguish between main points and sub-claims; being able to recognize the difference between the two will prove incredibly useful when composing your own thesis-driven essays.