Cellular and Molecular Neurobiology

, Volume 25, Issue 2, pp 245–282

Imaging Brain Activity With Voltage- and Calcium-Sensitive Dyes

  • Bradley J. Baker
  • Efstratios K. Kosmidis
  • Dejan Vucinic
  • Chun X. Falk
  • Lawrence B. Cohen
  • Maja Djurisic
  • Dejan Zecevic
Article

Abstract

This paper presents three examples of imaging brain activity with voltage- or calcium-sensitive dyes and then discusses the methodological aspects of the measurements that are needed to achieve an optimal signal-to-noise ratio.

Internally injected voltage-sensitive dye can be used to monitor membrane potential in the dendrites of invertebrate and vertebrate neurons in in vitro preparations.

Both invertebrate and vertebrate ganglia can be bathed in voltage-sensitive dyes to stain all of the cell bodies in the preparation. These dyes can then be used to follow the spike activity of many neurons simultaneously while the preparations are generating behaviors.

Calcium-sensitive dyes that are internalized into olfactory receptor neurons in the nose will, after several days, be transported to the nerve terminals of these cells in the olfactory bulb. There they can be used to measure the input from the nose to the bulb.

Three kinds of noise are discussed. a. Shot noise from the random emission of photons from the preparation. b. Vibrational noise from external sources. c. Noise that occurs in the absence of light, the dark noise.

Three different parts of the light measuring apparatus are discussed: the light sources, the optics, and the cameras.

The major effort presently underway to improve the usefulness of optical recordings of brain activity are to find methods for staining individual cell types in the brain. Most of these efforts center around fluorescent protein sensors of activity.

Keywords

optical recording voltage-sensitive dyes calcium-sensitive dyes signal-to-noise ratio 

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • Bradley J. Baker
    • 1
    • 3
  • Efstratios K. Kosmidis
    • 1
  • Dejan Vucinic
    • 1
  • Chun X. Falk
    • 1
    • 2
  • Lawrence B. Cohen
    • 1
    • 2
  • Maja Djurisic
    • 1
  • Dejan Zecevic
    • 1
  1. 1.Department of Cellular and Molecular PhysiologyYale University School of MedicineNew Haven
  2. 2.RedShirtImaging, LLCFairfield
  3. 3.Department of Cellular and Molecular PhysiologyYale University School of MedicineNew Haven

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