دانلود مقاله ISI انگلیسی شماره 65327
ترجمه فارسی عنوان مقاله

رزونانس تصادفی در مدل CA3–CA1 هیپوکامپ: یک مکانیسم حافظه امکان پذیر

عنوان انگلیسی
Stochastic resonance in the hippocampal CA3–CA1 model: a possible memory recall mechanism
کد مقاله سال انتشار تعداد صفحات مقاله انگلیسی
65327 2002 13 صفحه PDF
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Neural Networks, Volume 15, Issue 10, December 2002, Pages 1171–1183

ترجمه کلمات کلیدی
رزونانس تصادفی؛ هیپوکامپ؛ مدل شبکه عصبی؛ حافظه؛ مدل سلول هرمی؛ فعالیت ریتمیک خودانگیخته - نویز رنگی ؛ تخلیه متناوب
کلمات کلیدی انگلیسی
Stochastic resonance; Hippocampus; Neural network model; Memory recall; Pyramidal cell model; Spontaneous rhythmic activity; Colored noise; Burst discharges
پیش نمایش مقاله
پیش نمایش مقاله  رزونانس تصادفی در مدل CA3–CA1 هیپوکامپ: یک مکانیسم حافظه امکان پذیر

چکیده انگلیسی

Stochastic resonance (SR) in a hippocampal network model was investigated. The hippocampal model consists of two layers, CA3 and CA1. Pyramidal cells in CA3 are connected to pyramidal cells in CA1 through Schaffer collateral synapses. The CA3 network causes spontaneous irregular activity (broadband spectrum peaking at around 3 Hz), while the CA1 network does not. The activity of CA3 causes membrane potential fluctuations in CA1 pyramidal cells. The CA1 network also receives a subthreshold signal (2.5 or 50 Hz) through the perforant path (PP). The subthreshold PP signals can fire CA1 pyramidal cells in cooperation with the membrane potential fluctuations that work as noise. The firing of the CA1 network shows typical features of SR. When the frequency of the PP signal is in the gamma range (50 Hz), SR that takes place in the present model shows distinctive features. 50 Hz firing of CA1 pyramidal cells is modulated by the membrane potential fluctuations, resulting in bursts. Such burst firing in the CA1 network, which resembles the firing patterns observed in the real hippocampal CA1, improves performance of subthreshold signal detection in CA1. Moreover, memory embedded at Schaffer collateral synapses can be recalled by means of SR. When Schaffer collateral synapses in subregions of CA1 are augmented three-fold as a memory pattern, pyramidal cells in the subregions respond to the subthreshold PP signal due to SR, while pyramidal cells in the rest of CA1 do not fire.