期刊
JOURNAL OF NEUROSCIENCE METHODS
卷 108, 期 1, 页码 39-48出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0165-0270(01)00368-5
关键词
dynamic clamp; artificial synapses; simulation; Hodgkin-Huxley; conductance; neural circuits; synaptic rings
The dynamic clamp protocol allows an experimenter to simulate the presence of membrane conductances in, and synaptic connections between, biological neurons. Existing protocols and commercial ADC/DAC boards provide ready control in and between less than or equal to2 neurons. Control at >2 sites is desirable when studying neural circuits with serial or ring connectivity. Here, we describe how to extend dynamic clamp control to four neurons and their associated synaptic interactions, using a single IBM-compatible PC, an ADC/DAC interface with two analog outputs, and an additional demultiplexing circuit. A specific C++ program, DYNCLAMP4, implements these procedures in a Windows environment, allowing one to change parameters while the dynamic clamp is running. Computational efficiency is increased by varying the duration of the input-output cycle. The program simulates less than or equal to8 Hodgkin-Huxley-type conductances and less than or equal to 18 (chemical and/or electrical) synapses in less than or equal to4 neurons and runs at a minimum update rate of 5 kHz on a 450 MHz CPU. (Increased speed is possible in a two-neuron version that does not need auxiliary circuitry). Using identified neurons of the crustacean stomatogastric ganglion, we illustrate on-line parameter modification and the construction of three-member synaptic rings. (C) 2001 Elsevier Science B.V. All rights reserved.
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