Increased cortical activation during hearing of speech in cochlear implant users

Yasushi Naito, Ichiro Tateya, Nobuya Fujiki, Shigeru Hirano, Koichi Ishizu, Yasuhiro Nagahama, Hidenao Fukuyama, Hisayoshi Kojima

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


To investigate the cortical activities while listening to noise and speech in cochlear implant (CI) users, we compared cerebral blood flow in postlingually deafened CI users with that in normal hearing subjects using positron emission tomography. While noise activation in CI users did not significantly differ from that in normal subjects, hearing speech activated more cortical areas in CI users than in normal subjects. A comparison of speech activation in these two groups revealed higher activation in CI users not only in the temporal cortices but also in Broca's area and its right hemisphere homologue, the supplementary motor area and the anterior cingulate gyrus. In postlingually deafened subjects, the hearing of speech coded by CI may be accompanied by increased activation of both the temporal and frontal cortices. Copyright (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)139-146
Number of pages8
JournalHearing Research
Issue number1-2
Publication statusPublished - 05-2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Sensory Systems


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