生物神經(jīng)元可感知多種外界刺激信號,這些信號可被轉(zhuǎn)化為等效的電流來驅(qū)動神經(jīng)元。因此,神經(jīng)元的膜電位可通過外刺激調(diào)控呈現(xiàn)各類放電模式。實際上,可靠的神經(jīng)元模型應(yīng)考慮內(nèi)在的生物物理效應(yīng)以及功能性編碼。一個重要且有趣的問題是弄清外界信號轉(zhuǎn)錄過程的物理機(jī)制。外界信號通常被轉(zhuǎn)化為等效的跨膜電流或信號源以誘發(fā)動作電位。提出一個光電神經(jīng)元模型以表達(dá)其非線性編碼過程和外界光信號驅(qū)動神經(jīng)元的電活動響應(yīng)。在該模型中,使用一個光電管激活一個簡單的Fitz Hugh-Nagumo（FHN）神經(jīng)元電路,并施加外界光信號（光照）于光電管產(chǎn)生時變電流源或電壓源以驅(qū)動神經(jīng)元電路。這種光電管耦合的神經(jīng)元電路能探測和感知外界光信號,其作用類似于人工電子眼。通過分岔詳細(xì)分析神經(jīng)元模態(tài)遷移和放電斑圖特征。通過調(diào)制神經(jīng)元電路的光電流,神經(jīng)元膜電位序列可呈現(xiàn)靜息態(tài)、尖峰放電、簇放電和混沌特征。這些結(jié)果可為進(jìn)一步研究神經(jīng)動力學(xué)和神經(jīng)電路提供參考。 

【文章來源】：Frontiers of Information Technology & Electronic Engineering. 2020年09期

【文章頁數(shù)】：11 頁

【文章目錄】：
1 Introduction
2 Model,scheme,and discussion
3 Conclusions


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