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Pflugers Arch. 2002 Jul;444(4):491-8. Epub 2002 Apr 17.

In vivo, low-resistance, whole-cell recordings from neurons in the anaesthetized and awake mammalian brain.

Author information

1
Abteilung Zellphysiologie, Max-Planck-Institut für medizinische Forschung, Jahnstrasse 29, Heidelberg 69120, Germany. tmargrie@sun0.mpimf-heidelberg.mpg.de

Abstract

A blind patch-clamp technique for in vivo whole-cell recordings in the intact brain is described. Recordings were obtained from various neuronal cell types located 100-5,000 microm from the cortical surface. Access resistance of recordings was as low as 10 M Omega but increased with recording depth and animal age. Recordings were remarkably stable and it was therefore possible to obtain whole-cell recordings in awake, head-fixed animals. The whole-cell configuration permitted rapid dialysis of cells with a calcium buffer. In most neurons very little ongoing action potential (AP) activity was observed and the spontaneous firing rates were up to 50-fold less than what has been reported by extracellular unit recordings. AP firing in the brain might therefore be far sparser than previously thought.

PMID:
12136268
DOI:
10.1007/s00424-002-0831-z
[Indexed for MEDLINE]

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