Amnesia, confabulation and nonaphasic misnaming after left thalamic infarct

Ryuichiro Hayashi, Masashi Ohashi, Ryo Watanabe, Masaru Mimura, Yasushi Katsumata

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A 72-year-old right handed woman developed amnesia, confabulation and abnormal (bizarre) verbal response after the left thalamic infarction. Clinical features including disorientation, euphoria and various kinds of paraphasia coincided in nonaphasic misnaming. MR images showed that lesions involved the genu of the internal capsule, the anteroventral nucleus, the lateroventral nucleus, intralaminar nuclei, the mamillothalamic tract and the region around the ventral thalamus. 99mTc-HMPAO-SPECT revealed decreased uptake in the left frontal lobe, probably due to the disconnection from the thalamus. These findings suggest that the dysfunction of the thalamus (mainly ventrolateral) and the left frontal lobe caused the disturbance of the self-monitoring in the language use, which generated confabulation and nonaphasic misnaming in our case.

Original languageEnglish
Pages (from-to)530-535
Number of pages6
JournalBrain and Nerve
Issue number6
Publication statusPublished - 2003 Jun 1
Externally publishedYes


  • Confabulation
  • Frontal lobe
  • Nonaphasic misnaming
  • Thalamus

ASJC Scopus subject areas

  • General Neuroscience


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