the act or process of perseverating.
Psychiatry. the pathological, persistent repetition of a word, gesture, or act, often associated with brain damage or schizophrenia.

1605–15 in sense “perseverance”; persevere + -ation, or < Latin perseverātiōn-, stem of persevērātiō Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
perseveration (pɜːˌsɛvəˈreɪʃən)
1.  the tendency for an impression, idea, or feeling to dissipate only slowly and to recur during subsequent experiences
2.  an inability to change one's method of working when transferred from one task to another

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American Heritage
Medical Dictionary

perseveration per·sev·er·a·tion (pər-sěv'ə-rā'shən)

  1. Uncontrollable repetition of a particular response, such as a word, phrase, or gesture, despite the absence or cessation of a stimulus, usually caused by brain injury or other organic disorder.

  2. The tendency to continue or repeat an act or activity after the cessation of the original stimulus.

The American Heritage® Stedman's Medical Dictionary
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