Roberto Ruiz

This chapter focuses on one of the common fallacies in Western philosophy: accent. Accent is a fallacy of pragmatics. The fallacy of accent takes place when a premise in an argument seems to rely for its meaning on one possible vocal emphasis, but a conclusion is drawn that relies on an extrapolation from a different vocal emphasis of the same phrase. Such ambiguities are often the result of unacknowledged differences in background beliefs, attitudes, and expectations that people may implicitly bring to the reading of a passage. The fallacy of accent can also be committed, therefore, when a passage is quoted without its original context, and erroneous inferences are drawn based on this (often deliberate) distortion. A classic example of this kind of deliberate form of quote mining is often used by creationists in their attempt to discredit Darwin's theory of evolution by natural selection.

This chapter focuses on one of the common fallacies in Western philosophy called 'poisoning the well' (PTW). There are some forms of ad hominem varieties that are usually a response to an interlocutor's claims. Unlike them, PTW occurs when we illegitimately prime our audience with a pre‐emptive strike against, or with adverse information about, an argumentative opponent before the latter has had a chance to say anything in her own defense, or in defense of her point of view. This has the insidious effect of creating a conceptual framework according to which the audience – and maybe even the interlocutor herself – will interpret her claims as 'fulfilling' and 'confirming' the presumptions buried inside this conceptual trap. Most of the time Karl Popper's criterion of falsifiability is still quite a useful tool and one that can help us gain a firmer understanding of PTW.

This chapter focuses on one of the common fallacies in Western philosophy called 'amphiboly'. More formally speaking, the fallacy of amphiboly occurs when the meaning of a phrase or sentence is indeterminate or ambiguous, particularly as a result of poor syntax, and especially when further inferences are drawn based on the acceptance of an unintended meaning of the passages. Amphibolies can also have the potential to either threaten political careers or make them indefinitely memorable. The ambiguities found in cases of amphiboly usually arise from mistakes in grammar but also from various forms of linguistic booby traps. It is important to note, however, that not all instances of amphiboly are trivial. The interpretation of carelessly constructed legal contracts and wills, for instance, has been known to produce unnecessary and painful conflicts.