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Sometimes I observe a person very competent in one area (say, Philosophy) peremptorily expressing his opinion on an unrelated area (say, Medicine) as if he were an expert there also (and he is not).

In other words, competence in one domain translates into a subjective perception of competence in an unrelated domain.

Is there a name for this cognitive bias?

This is more than mere Kruger-Dunning effect ("Unskilled and Unaware of It") - the incorrect subjective perception of competence in one domain is driven by the correct perception of competence in another domain.

PS. Amazingly, the same question has been already asked elsewhere:

Is there a term for a person who moves from one field of expertise to a new field and has an inflated belief in their competence in the new field?

The answers offered there are:

PPS. Related: Does Golden Hammer really exist?

  • If it is not incorrect (cf. your comment re this is more than...), then, why would that be cognitive bias? If it is correct, even if the person is not an expert, it would be cognitive intelligence. Inte-legere, to read between the lines. Similar to emotional intelligence....Sounds like a good thing to me.... – Lambie Nov 22 '16 at 19:29
  • @Lambie: it is a bias because the person incorrectly presumes his competence. it is not KD because it appears to be fueled by an unrelated competence. – sds Nov 22 '16 at 19:37
  • @sda there is a contradiction in the question. – Lambie Nov 22 '16 at 19:39
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    Close to such cognitive bias, but not covering it all: "presumption" (assuming something without having any real knowledge about it, and that is usually not a good thing). – Graffito Nov 22 '16 at 21:53
  • @Graffito: you might even say "presumptuousness" :-) – sds Nov 22 '16 at 22:06
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The "halo effect" is defined by oxforddictionaries.com as

The tendency for an impression created in one area to influence opinion in another area

Usually, this term would be applied to the opinions of others towards the would-be cross-disciplinary expert described the question, but perhaps it could be applied to the would-be expert's opinion of him- or herself.

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