Real-time experimental control in cellular neurophysiology

A. D. Dorval, T. L. Netoff, J. A. White

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Electrophysiologists study neuronal input-output behavior by approximating synaptic input with a predetermined current waveform. In living tissue however, a synaptic event induces a conductance change in the neuronal membrane, and the current passed through that conductance is not predetermined, but a function of the continuously changing membrane potential. Using high frequency feedback, the dynamic clamp technique allows experimentalists to introduce conductance changes in living neurons. Using a dynamic clamp, we find that current steps elicit greater membrane potential variance than more natural conductance steps. In addition, reliability profiles to the same pseudo-synaptic waveform change when currents are substituted for conductances. Hence, under certain conditions current input is an invalid approximation of conductance changes, and dynamic clamp should be used to examine neuronal input-output behaviors. Furthermore, dynamic clamp can be used as a control tool for other neuronal experiments. We demonstrate the use of a dynamic clamp as a signal detector, a frequency control device, and as a way to connect living cells to virtual networks. Thus we show that the dynamic clamp technique is a critical tool not only useful for mapping neuronal input-output function, but in a broader context of neuronal control.

Original languageEnglish (US)
Title of host publicationConference Proceedings - 1st International IEEE EMBS Conference on Neural Engineering
EditorsLaura J. Wolf, Jodi L. Strock
PublisherIEEE Computer Society
Pages71-74
Number of pages4
ISBN (Electronic)0780375793
DOIs
StatePublished - 2003
Event1st International IEEE EMBS Conference on Neural Engineering - Capri Island, Italy
Duration: Mar 20 2003Mar 22 2003

Publication series

NameInternational IEEE/EMBS Conference on Neural Engineering, NER
Volume2003-January
ISSN (Print)1948-3546
ISSN (Electronic)1948-3554

Other

Other1st International IEEE EMBS Conference on Neural Engineering
CountryItaly
CityCapri Island
Period3/20/033/22/03

Keywords

  • Biomembranes
  • Clamps
  • Computational modeling
  • Frequency control
  • In vivo
  • Neurofeedback
  • Neurons
  • Neurophysiology
  • Signal detection
  • Voltage

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