MULTIPLE DYNAMICAL MODES OF THALAMIC RELAY NEURONS - RHYTHMIC BURSTING AND INTERMITTENT PHASE-LOCKING

被引:84
作者
WANG, XJ [1 ]
机构
[1] UNIV CHICAGO, JAMES FRANCK INST, DEPT MATH, CHICAGO, IL 60637 USA
关键词
D O I
10.1016/0306-4522(94)90095-7
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
A model of thalamocortical relay neuron is studied to assess whether a 7-14 Hz (spindle) oscillation and a 0.5-4 Hz (delta) oscillation may result from the interplay between a T-type calcium current and a non-specific cation sag current. With moderate change of membrane parameter values, the model neuron can exhibit both the spindle and delta rhythms, at different levels of hyperpolarization; only the slower (delta) one or none. In the case when the model neuron is not intrinsically oscillatory, its response to rhythmic hyperpolarization is complex, and displays the ''intermittent phase-locking'' phenomenon where bursts of Na+ action potentials occur infrequently but their occurrence is phase-locked to the rhythmic input. The rhythmic bursting, whenever possible, is shown to emerge (bifurcate) from a subthreshold oscillation. Near the bifurcation chaotic discharge patterns are observed, where spikes occur intermittently at randomly chosen cycles of a mostly subthreshold slow oscillation. Furthermore, when both the spindle and delta modes can be realized, the transition between the two appears as a sudden drop of the rhythmic frequency with increased hyperpolarization. The T-type calcium current and the sag current may explain the ''intermittent phase-locking'' phenomenon that is characteristic to thalamic relay neurons during spindle oscillation and provide a cellular basis for the 7-14 Hz rhythm and the slower 0.5-4 Hz rhythm.
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页码:21 / 31
页数:11
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