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ref: Hubel-1957.03 tags: Hubel original tungsten electrode date: 01-03-2012 23:46 gmt revision:3 [2] [1] [0] [head]

PMID-17793797[0] Tungsten Microelectrode for Recording from Single Units.

  • Advancement upon the micropipette.
  • Lacquer insulation.
  • Suggest that 5um tips or smaller are the best for single unit recording.
  • Steel becomes too fragile near the tip of a very sharp point (what about steel blades?)
  • Electropolishing: immerse a few milimeters in KNO 2 solution and apply 2-6V AC.
    • Such a result is explained by the fact that the meniscus height depends on the diameter of the wire, which decreases as the polishing proceeds.
  • 75M resistance (!!); 500k to 5M at 5-10kHz.
  • Note that he had been recording from at least 1959.

____References____

[0] Hubel DH, Tungsten Microelectrode for Recording from Single Units.Science 125:3247, 549-50 (1957 Mar 22)