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Study of time-sequential signal processing of auditory nerves using a cochlear implant

Study of time-sequential signal processing of auditory nerves using a cochlear implant
使用人工耳蜗的听觉神经时序信号处理研究
批准号:
04455001
负责人:
IFUKUBE Tohru
金额:
$4.67万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for General Scientific Research (B)
财政年份:
1992
资助国家:
日本
项目状态:
已结题
起止时间:
1992 至 1993

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中文摘要
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英文摘要
The purpose of the research is to investigate what degree of tiem-sequential signals can be discriminated by cochlear electrical stimulation and what kind of physiological and psychological feefcts by the electrimental results, time resolution obtained by the time-sequential electrical stimulation to the cochlea was found to be superior to that by auditory stimulation and a speech processing method that spectral patterns are converted into time-sequential signals was found to be effective for transmitting the speech information to the auditory nerves. Furthermore, from the result that tnnitus was suppressed by subthreshold electrical stimulation to the cochlea, an implantable tinnitus suppresser was designed and adopted to three patients with tinnitus. The following is summary of research results.(1)Time resolution was found to be about 150 us from the test of time-sequential electrical stimulation to the cochlea of the hearing impaired and one of pa ; tients could discriminate 5 vowels converted into time-sequential stimuli at 60% correct rate without training.(2)From the results of tinnitus suppression tests by more than 300 persons with tinnitus, it was found that tinnitus disappeared at 30 % of patients and tinnitus reduced at 63%.(3)From the measurements of SOUID, EEG and blood flow, it was assumed that parasympathetic nerves of autonomic nervous system became superior, and the brainstem and the limbic system became active. Although the purpose of the research was to investigate the signal processing mechanism of auditory nervous system, main results were obtained from tinnitus suppression tests. However, it is expected that a part of signal processing mechanisms will be clarfied by the long term use of implantable tinnitus suppressers. As the implantation technique was established and the biocompatibility of the device was porven, the research will be continued to find the optimal signal conversion method of speech signals.
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会议论文
伊福部達: "新編・感覚知覚ハンドブック" 誠信書房,東京, 20 (1994)
Ifukube, T.:“新版:感官知觉手册” Seishin Shobo,东京,20(1994)
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通讯作者:
平田 恵啓: "蝸牛電気刺激によって生じる感覚について" Audiology Japan. 35. 659-665 (1992)
Keihiro Hirata:“关于耳蜗电刺激引起的感觉”日本听力学 35. 659-665 (1992)。
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通讯作者:
J.Matushima, M.Kumagai, C.Harada, K.Takahashi, M.Inuyama and T.Ifukube: "Experiments on time resolution of auditory, tartile, and promontory electrical stimulation" J.Otorary gology. 95. 1366-1371 (1992)
J.Matushima、M.Kumagai、C.Harada、K.Takahashi、M.Inuyama 和 T.Ifukube:“听觉、tartile 和海角电刺激的时间分辨率实验”J.Otorary gology。
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通讯作者:
T.Ifukube, Y.Hirata, C.Wada and J.Matushima: "Comparison of discrimination characteristics between vibrotactile and electrical stimulation to auditory nerves" Proc.14th.Inter Conf.ICA. 14. H3-9 (1992)
T.Ifukube、Y.Hirata、C.Wada 和 J.Matushima:“振动触觉和电刺激对听觉神经的辨别特征的比较”Proc.14th.Inter Conf.ICA。
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