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Capítulo 2 del libro de texto del curso.

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Discurso de aceptación del Doctorado Honoris Causa otorgado por la
Universidad del Valle, Cali, 21 de noviembre de 1980

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El lenguaje como clave para detectar noticias falsas

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El lenguaje como clave para detectar noticias falsas

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Los proveedores de desinformación pueden detectarse por las palabras particulares que estos usan, de acuerdo con investigaciones recientes.

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he internet represents the biggest explosion of data in human history. There's more out there, and more access to it than ever before. The information ecosystem is a bit like a tropical rainforest: luxuriant, dense and fiercely competitive. As such, it contains its fair share of predators and poisonous plants.

Deliberately misleading articles, websites and social media posts can come about for lots of different reasons: they might be trying to influence elections or policies; they might represent a form of cyberwarfare between states; they might be aimed at raising someone's profile and influence, or discrediting their opponents. Or they might simply be about making money, relying on the attention-grabbing nature of outrageous lies to generate ad revenue, as in the case of the " digital gold rush " that saw a small Macedonian town register more than 150 pro-Trump websites during the 2016 presidential race.

We may have to rely on AI to do the heavy lifting for us - and tell us whether telltale linguistic patterns are present

One thing they may have in common, however, is the language they use.

Having an effective way of identifying fake news is important. The whole reason it's a problem is that it mimics reliable reporting - and people can't always tell the difference. That's why, for the past few years, researchers have been trying to work out what the linguistic characteristics of fake news are. Computers that are fed material already classified as misleading are able to identify patterns in the language used. They're then able to apply that knowledge to new material, and flag it as potentially dubious.

One such project, led by Fatemeh Torabi Asr at Simon Fraser University in Canada, recently found that "on average, fake news articles use more ... words related to sex, death and anxiety". "Overly emotional" language is often deployed. In contrast, "Genuine news ... contains a larger proportion of words related to work (business) and money (economy)."

Another group of researchers analysed the relationship of various grammatical categories to fake news. They concluded that words which can be used to exaggerate are all found more often in deliberately misleading sources. These included superlatives, like "most" and "worst", and so-called subjectives, like "brilliant" and "terrible". They noted that propaganda tends to use abstract generalities like "truth" and "freedom", and intriguingly showed that use of the second-person pronoun "you" was closely linked to fake news.

Some of these approaches have their problems. Jack Grieve, at the University of Birmingham, cautions that scholars don't always control for genre - so the differences in language seen above might just come down to the difference between a more formal news article, and a more casual Facebook post.

To get around this problem, Grieve's team has compared 40 retracted and 41 non-retracted articles by Jayson Blair, who resigned from the New York Times in disgrace in 2003. These were produced in a single genre - national newspaper writing - but they still displayed subtle, probably unconscious differences in register, related, according to Grieve, to the different communicative purposes they served (on the one hand to inform, on the other to deceive). Even though he was trying to pass his work off as factual, there were subtle tells that only become evident when the data is crunched. For example, there were more emphatics like "really" and "most" in Blair's retracted articles. He used shorter words and his language was less "informationally dense". The present tense cropped up more often and he relied on the third person pronouns "he" and "she" rather than full names - something that's typical of fiction.

So what does all this tell us? Clearly, we don't have a foolproof means of telling fact from fake yet, but there are certain features that should put us on our guard. Is the writing more informal than you'd expect? Does it contain lots of superlatives and emphatic language? Does it make subjective judgments or read more like narrative than reportage? Ultimately, we may have to rely on artificial intelligence to do the heavy lifting for us - and it should be able to tell us whether those telltale linguistic patterns seen in large datasets of fake news, invisible to the "naked eye", are present.

For me there's an interesting correspondence with certain kinds of political rhetoric here. The language of fakery, with its powerful subjective statements and focus on anxiety, has something in common with that used by populist leaders. Their style, which often involves "adversarial, emotional, patriotic and abrasive speech" should put us on our guard too. Cooler heads make for a more boring read, but they might get you a little closer to the truth.

David Shariatmadari is a Guardian editor and writer, and author of Don't Believe A Word: The Surprising Truth About Language

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Could language be the key to detecting fake news? | David Shariatmadari

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he internet represents the biggest explosion of data in human history. There's more out there, and more access to it than ever before. The information ecosystem is a bit like a tropical rainforest: luxuriant, dense and fiercely competitive. As such, it contains its fair share of predators and poisonous plants.

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Hace muchos años, dediqué parte de mi tiempo a escribir especificaciones de software usando lógica de predicados de primer orden. Era una forma curiosa de razonamiento sobre invariantes, usando matemáticas discretas en vez de la notación usual (inglés). Y aportó precisión donde había ambigüedad potencial, y rigor donde había vaguedad y palabras insustanciales.

En esa misma época, estudié minuciosamente algunos libros sobre lógica proposicional, tanto modernos como medievales, uno de los cuales fue A Handbook of Logical Fallacies, de Robert Gula. Esta obra me recordó una lista heurística que había garabateado en un cuaderno una década antes sobre cómo argumentar; era el resultado de años de discusiones con extraños en foros online y tenía cosas como trata de no hacer afirmaciones generales sobre nada. Para mí, ahora es algo obvio, pero para un colegial era un descubrimiento excitante.

Pronto encontré evidente que formalizar los razonamientos propios puede tener beneficios útiles, tales como claridad de pensamiento y expresión, objetividad y mayor confianza. La habilidad de analizar argumentos también ayuda a establecer una regla para saber cuándo retirarse de discusiones que no llevan a ningún sitio.

Temas y acontecimientos que afectan a nuestras vidas y a nuestra sociedad, como los derechos civiles o las elecciones presidenciales, normalmente hacen a la gente discutir sobre creencias y política. Observando algunas de estas discusiones, se adquiere la sensación de que muchas de ellas carecen de razonamientos de calidad. El objetivo

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Este libro se dirige a recién llegados al campo del razonamiento lógico, y en concreto, a aquellos que, para tomar una expresión de Pascal, están tan acostumbrados que entienden todo mejor a través de lo visual. He seleccionado un pequeño conjunto de errores comunes en razonamiento y les he dado una configuración visual mediante ilustraciones fáciles de recordar, además de un montón de ejemplos.

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