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An argument from authority (argumentum ab auctoritate), also called an appeal to authority, or argumentum ad verecundiam, is a form of argument in which the opinion of an authority on a topic is used as evidence to support an argument. Some consider it to be a practical and sound way of obtaining knowledge that is generally likely to be correct when the authority is real, pertinent, and universally accepted. and others consider it to be a fallacy to cite the views of an authority on the discussed topic as a means of supporting an argument., while all agree that appeals to authority are not a valid form of logical proof.

Historically, opinion on the appeal to authority has been divided: it is listed as a non-fallacious argument as often as a fallacious argument in various sources, as some hold that it can be a strong or at least valid defeasible argument and others that it is weak or an outright fallacy.

The general form of this type of argument is:

Person or persons A claim that X is true.
Person or persons A are experts in the field concerning X.
Therefore, X should be believed.

Use in science

Scientific knowledge is best established by evidence and experiment rather than argued through authority as authority has no place in science. Carl Sagan wrote of arguments from authority:

One of the great commandments of science is, "Mistrust arguments from authority." ... Too many such arguments have proved too painfully wrong. Authorities must prove their contentions like everybody else.

One example of the use of the appeal to authority in science dates to 1923, when leading American zoologist Theophilus Painter declared, based on poor data and conflicting observations he had made, that humans had 24 pairs of chromosomes. From the 1920s until 1956, scientists propagated this "fact" based on Painter's authority, despite subsequent counts totaling the correct number of 23. Even textbooks with photos showing 23 pairs incorrectly declared the number to be 24 based on the authority of the then-consensus of 24 pairs.

This seemingly established number generated confirmation bias among researchers, and "most cytologists, expecting to detect Painter's number, virtually always did so". Painter's "influence was so great that many scientists preferred to believe his count over the actual evidence", and scientists who obtained the accurate number modified or discarded their data to agree with Painter's count.

Use in logic

In the deductive method

This argument has been considered a logical fallacy since its introduction by John Locke and Richard Whately. In particular, this is a form of genetic fallacy; in which the conclusion about the validity of a statement is justified by appealing to the characteristics of the person who is speaking, such as in the ad hominem fallacy. For this argument, Locke coined the term argumentum ad verecundiam (appeal to shamefacedness/modesty) because it appeals to the fear of humiliation by appearing disrespectful to a particular authority.

This qualification as a logical fallacy implies that this argument is invalid when using the deductive method, and therefore it can't be presented as infallible. In other words, it's logically invalid to prove a claim is true because an authority has said it. The explanation is simple: authorities can be wrong, and the only way of logically proving a claim is providing real evidence and/or a valid logical deduction of the claim from the evidence.

The appeal to authority carries rhetorical force as an example of Ethos in rhetoric.

In the inductive method

However, when used in the inductive method, which implies the conclusions can never be proven or certain, this argument can be considered sound and not fallacious. If a person has a credible authority, some say ipse dixit but derided by detractors as name-dropping that evinces Authority Bias and credentialism. Others point to what they consider to be counterexamples to this, seen with Nobel disease. Still others say further that it is more likely to be correct if there is consensus about the topic between the credible sources, yet others point to counterexamples such as the Manifesto of the Ninety-Three, showing that this approach can lead one to affirm actions generally considered immoral, similar to the Milgram experiment.

Nonetheless, it would also be a fallacy, even in the inductive method, when the source of the claim is a false authority, such as when the supposed authority is not a real expert, or when supporting a claim outside of their area of expertise. This is referred to as an "argument from false authority". It can also be considered a fallacy when the authority is an expert in the topic but their claims are controversial or not unanimous between other experts in the field. Some consider that it can be used in a cogent form if all sides of a discussion agree on the reliability of the cited authority in the given context. This form of argument can be considered sound if both parties to the debate agree that the authority is in fact an expert;

Furthermore, some claim that the act of trusting authorities is unavoidable for science to progress, since it would be a lot harder if not impossible for students and researchers to always resort to the factual evidence and demonstrations for all the knowledge they need to obtain to be able to come across new scientific findings.

Confusion about its classification as a logical fallacy but a sound inductive criterion

Some authors fail to distinguish between the classification of this argumentum ad verecundiam as a logical fallacy, and its classification as a fallacy within the inductive method 'only' when the authority is false or their claims disputed; but failing to address that the weight of this argument can never be more than relative and never a proof since it is logically invalid. This serious mistake has sadly been widely popularized in the last few decades, and lead to the wrong belief that the ad verecundiam argument is logically valid and therefore an absolute proof.

The qualification of this type of argument as logical fallacy implies that it is not a valid way to deduce a conclusion, that is, to prove it. This doesn't mean that a claim from a credible respected authority doesn't generally have a bigger probability of being correct than that of somebody who has no expertise at all; but the strength of this argument is not absolute as it's wrongfully believed by some.

In general the issue shares many similarities with the issues which arise within the Philosophy of Testimony.

Appeal to false authority

This fallacy is used when a person appeals to a false authority as evidence for a claim. These fallacious arguments from authority are the result of citing a non-authority as an authority. The philosophers Irving Copi and Carl Cohen characterized it as a fallacy "when the appeal is made to parties having no legitimate claim to authority in the matter at hand". Copi stated: "In attempting to make up one's mind on a difficult and complicated question, one may seek to be guided by the judgment of an acknowledged expert who has studied the matter thoroughly. This method of argument is in many cases perfectly legitimate. But when an authority is appealed to for testimony in matters outside the province of that authority's special field, the appeal commits the fallacy of argumentum ad verecundiam ".

In other words, one could say that the premise of the argument does not hold in such a case, rendering the reasoning fallacious.

An example of the fallacy of appealing to an authority in an unrelated field would be citing Albert Einstein as an authority for a determination on religion when his primary expertise was in physics.

It is also a fallacious ad hominem argument to argue that a person presenting statements lacks authority and thus their arguments do not need to be considered. As appeals to a perceived lack of authority, these types of argument are fallacious for much the same reasons as an appeal to authority.

Other related fallacious arguments assume that a person without status or authority is inherently reliable. For instance, the appeal to poverty is the fallacy of thinking that someone is more likely to be correct because they are poor. When an argument holds that a conclusion is likely to be true precisely because the one who holds or is presenting it lacks authority, it is a fallacious appeal to the common man.

Roots in cognitive bias

Arguments from authority that are based on the idea that a person should conform to the opinion of a perceived authority or authoritative group are rooted in psychological cognitive biases such as the Asch effect. In repeated and modified instances of the Asch conformity experiments, it was found that high-status individuals create a stronger likelihood 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 experiments by another group of researchers 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.

Another study shining light on the psychological basis of the fallacy as it relates to perceived authorities are the Milgram experiments, which demonstrated that people are more likely to go along with something when it is presented by an authority. In a variation of a study where the researchers did not wear lab coats, thus reducing the perceived authority of the tasker, the obedience level dropped to 20% from the original rate, which had been higher than 50%. Obedience is encouraged by reminding the individual of what a perceived authority states and by showing them that their opinion goes against this authority.

Scholars have noted that certain environments can produce an ideal situation for these processes to take hold, giving rise to groupthink. In groupthink, individuals in a group feel inclined to minimize conflict and encourage conformity. Through an appeal to authority, a group member might present that opinion as a consensus and encourage the other group members to engage in groupthink by not disagreeing with this perceived consensus or authority. One paper about the philosophy of mathematics states that, within academia,

If...a person accepts our discipline, and goes through two or three years of graduate study in mathematics, he absorbs our way of thinking, and is no longer the critical outsider he once was...If the student is unable to absorb our way of thinking, we flunk him out, of course. If he gets through our obstacle course and then decides that our arguments are unclear or incorrect, we dismiss him as a crank, crackpot, or misfit.

Corporate environments are similarly vulnerable to appeals to perceived authorities and experts leading to groupthink, as are governments and militaries.

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• Authority
• Genetic fallacies
• Relevance fallacies