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Fallacious examples of using the appeal include any appeal to authority used in the context of logical reasoning, and appealing to the position of an authority or authorities to dismiss evidence, as, while authorities can be correct in judgments related to their area of expertise more often than laypersons, they can still come to the wrong judgments through error, bias, dishonesty, or falling prey to groupthink. Thus, the appeal to authority is not a generally reliable argument for establishing facts.
The phrase argumentum ad verecundiam is sometimes used synonymously to mean "argument from authority". While it is linked, it does not have the same meaning. The Latin noun verecundia means "modesty" or "shame". Its link to arguments from authority is that they are used to make those who lack authority feel shame about discussing issues they lack credentials of expertise in, and back out of an argument.
The equally fallacious counter-argument from authority takes the form:
This form is fallacious as it does not actually refute the evidence given by B, merely notes that there is disagreement with it. This form is especially unsound when there is no indication that A is aware of the evidence given by B.
Fallacious arguments from authority often are the result of citing a non-authority as an authority. First, when the inference refers to an inexpert authority, it is an appeal to inappropriate authority, which occurs when an inference relies upon a person or a group without relevant expertise or knowledge of the subject matter under discussion.
Also, because the argument from authority is not a logical argument in that it does not argue something's negation or affirmation constitutes a contradiction, it is fallacious to assert that the conclusion must be true. Such a determinative assertion is a logical non sequitur as the conclusion does not follow unconditionally, in the sense of being logically necessary.
In 1923, leading American zoologist Theophilus Painter declared based on his findings that humans had 24 pairs of chromosomes. From the 1920s to the 1950s, this continued to be held based on Painter's authority, despite subsequent counts totaling the correct number of 23. Even textbooks with photos clearly showing 23 pairs incorrectly declared the number to be 24 based on the authority of the then-consensus of 24 pairs.
The appeal to authority is an integral part of the Asch effect. In repeated and modified instances of the Asch conformity experiments, it was found that high-status individuals create a stronger likeliood of a subject agreeing with an obviously false conclusion, despite the subject normally being able to clearly see that the answer was incorrect.
Further, humans have been shown to feel strong emotional pressure to conform to authorities and majority positions. A repeat of the Asch experiments found that "Participants reported considerable distress under the group pressure", with 59% conforming at least once and agreeing with the clearly incorrect answer, whereas the incorrect answer was much more rarely given when no such pressures were present.