Obsessive thoughts (such as in anxiety disorders) can cause a behavior that looks quite similar to that of ADHD, even though the cognitive mechanisms are different. It's like how fever can be caused by both lymphoma and tonsillitis.

Imagine giving stimulants to someone with generalized anxiety disorder

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Déformation professionnelle (n.)
The tendency to look at things from the point of view of one's own profession or expertise.

It was originally used to describe bodily deformities caused by one's profession: If you look at skeletons of medieval archers, you'll see some deformity in their spine and unusually developed shoulder and arm bones due to the constant strain from drawing the bow. I also remember watching a professional arm wrestler being unable to fully extend his elbow due to all the training and muscle hypertrophy. It caused such a deformity that when he was asked to try the sport of climbing, at some point he failed, not for lack of strength, but because he couldn't extend his arms and reach out to high stones.

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One who desires to be or revels in being an object of envy could never deserve to be so.

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Certainly we shouldn’t pity him if we didn’t believe that he had pains; but is this a philosophical, a metaphysical belief? Does a realist pity more that an idealist or a solipsist?

— Ludwig Wittgenstein

A number of linguists have maintained that gesture and language form a unified whole, that no sharp boundary can be drawn between language and gesture. Similarly, some gesture theorists suggest that gesture and speech are tightly integrated, and even, in McNeill’s view, represent two aspects of a single process of utterance. Thus speech and gesture often express different, though related meanings, each complementing the other; together they permit the expression of more complex and nuanced meanings.

— Linguistics, by William B. McGregor