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Sherlock Scan - TV Tropes

"...everything."

"I knew you came from Afghanistan. From long habit the train of thoughts ran so swiftly through my mind that I arrived at the conclusion without being conscious of intermediate steps. There were such steps, however. The train of reasoning ran, 'Here is a gentleman of the medical type, but with the air of a military man. Clearly an army doctor, then. He has just come from the tropics, for his face is dark, and that is not the natural tint of his skin, for his wrists are fair. He has undergone hardship and sickness, as his haggard face says clearly. His left arm has been injured: he holds it in a stiff and unnatural manner. Where in the tropics could an English army doctor have seen much hardship and got his arm wounded? Clearly in Afghanistan.' The whole train of thought did not occupy a second. I then remarked that you came from Afghanistan, and you were astonished."

A device used to introduce a detective character and their skills. The detective mentions some fact about the person they've just met, something that is not immediately obvious and they have no way of knowing ("Quitting cigarettes appears to have been good for you", "How's the wedding planning going?", "You've holidayed in Italy recently"). The other character looks skeptical or surprised, then the detective describes their reasoning from a set of minor clues (state and style of clothes, marks on skin, tan, etc.) and consequent assumptions.

This is often not connected directly to the main plotline, but just to show "This is how the detective's mind works, and yes, the detective is That Good." The obvious subversion is to play this out, then have the detective admit that they were told the fact, or else for the other person to insist the detective is utterly wrong.

This is often cited as a demonstration of deductive reasoning (reaching a conclusion that is true by definition based on its premises) but is actually an example of inductive or abductive reasoning (reaching a conclusion that has some probability of being true based on its premises). In general, deductive arguments produce only trivial truths in a field like detective work, so induction is all you can use. Due to the laws of probability, this means that a detailed scan should be extremely likely to err on a few details, but this almost never happens in fiction. You will, however, find that once a character begins a Sherlock Scan their vision magically adjusts to 20/20, so that they can pick up every visual clue and expound on it without an unsightly squint.

Characters with such skills are often given a chance to reveal a softer side when their abilities result in Trauma Deduction.

A common parody of this is to have the detective note these details before drawing attention to the blindingly obvious clue, or occasionally notes the obvious clue immediately.

Sub-Trope of Exposition Intuition (Mr. Exposition provides exposition they have no way of actually knowing). Compare the Scarily Competent Tracker, which is like a Sherlock Scan done on footprints, and the Batman Cold Open. See also Hyper-Awareness, Awesomeness by Analysis, and Eagle-Eye Detection.

When this kind of reasoning makes no sense but still works, it's a Bat Deduction. When the above subversion of performing one of these before noting an obvious hint occurs, it's Clue, Evidence, and a Smoking Gun. If there's a "psychic" bent to the scan, it's Cold Reading. If a criminal does this to the detective interrogating them, then it might be part of a Hannibal Lecture.

In Video Game settings, this can manifest as Aura Vision or Enemy Scan against enemies, especially if done without the help of magic or a device. For when one uses this to find a location, see GPS Evidence.

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(They were simply the features the relevant authority said a handsome horse

should

have. The same applied to the horse's name.)

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