WordNet

specialized technical terminology characteristic of a particular subject
inability to use or understand language (spoken or written) because of a brain lesion

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〈U〉〈C〉(特定の職業やグループで用いる)特殊用語,専門語,通語 / 〈U〉訳の分からない言葉(文章),たわごと / 〈C〉混合語(pidgin Englishのように二つ以上の言語が混じってできたもの)
失語症

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/12/17 11:59:14」(JST)

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Jargon aphasia is a fluent or receptive aphasia in which the patient's speech is incomprehensible, but appears to make sense to them. Speech is fluent and effortless with intact syntax and grammar, but the patient has problems with the selection of nouns. They will either replace the desired word with another that sounds or looks like the original one, or has some other connection, or they will replace it with sounds. Accordingly, patients with jargon aphasia often use neologisms, and may perseverate if they try to replace the words they can't find with sounds.

Commonly, substitutions involve picking another (actual) word starting with the same sound (e.g. clocktower - colander), picking another semantically related to the first (e.g. letter - scroll), or picking one phonetically similar to the intended one (e.g. lane - late).

References

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English Journal

Arnoldus Van Rhijn on aphasia: A forgotten thesis.

Eling P.SourceRadboud University Nijmegen, Donders Institute for Brain, Cognition and Behavior, HE Nijmegen, The Netherlands.
Cortex; a journal devoted to the study of the nervous system and behavior.2011 Jul-Aug;47(7):885-98. Epub 2011 Mar 5.
PMID 21382617