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Proceedings Paper

Infrared laser stimulation of retinal and vestibular neurons
Author(s): Fabrice Bardin; Jean-Michel Bec; Emmanuelle S. Albert; Christian Hamel; Gérard Dupeyron; Christian Chabbert; Isabelle Marc; Michel Dumas
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Paper Abstract

The study of laser-neuron interaction has gained interest over the last few years not only for understanding of fundamental mechanisms but also for medical applications such as prosthesis because of the non-invasive characteristic of the laser stimulation. Several authors have shown that near infrared lasers are able to stimulate neurons. It is suggested that a thermal gradient induced by the absorption of the laser radiation on cells is the primary effect but the exact mechanism remains unclear. We show in this work that infrared laser radiations provide a possible way for stimulating retinal and vestibular ganglion cells. We describe relevant physical characteristics allowing safe and reproducible neuron stimulations by single infrared pulses. Calcium fluorescence imaging and electrophysiological recordings have been used to measure ionic exchanges at the neuron membrane. The stimulation system is based on a pulsed laser diode beam of a few mW. Effects of three different wavelengths (from 1470 to 1875 nm) and stimulation durations have been investigated. Variations of the stimulation energy thresholds suggest that the main physical parameter is the water optical absorption. Measurements of the temperature at the cell membrane show that a constant temperature rise is required to stimulate neurons, suggesting a photothermal process.

Paper Details

Date Published: 18 February 2011
PDF: 8 pages
Proc. SPIE 7883, Photonic Therapeutics and Diagnostics VII, 78834Y (18 February 2011); doi: 10.1117/12.874260
Show Author Affiliations
Fabrice Bardin, Univ. de Nîmes (France)
Institut d'Electronique du Sud, CNRS (France)
Jean-Michel Bec, Institut d'Electronique du Sud, CNRS (France)
Emmanuelle S. Albert, Institut des Neurosciences de Montpellier (France)
Christian Hamel, Institut des Neurosciences de Montpellier (France)
Gérard Dupeyron, CHU Nîmes (France)
Christian Chabbert, Institut des Neurosciences de Montpellier (France)
Isabelle Marc, Ecole des Mines d'Ales (France)
Michel Dumas, Institut d'Electronique du Sud, CNRS (France)

Published in SPIE Proceedings Vol. 7883:
Photonic Therapeutics and Diagnostics VII
Kenton W. Gregory M.D.; Nikiforos Kollias; Andreas Mandelis; Henry Hirschberg M.D.; Hyun Wook Kang; Anita Mahadevan-Jansen; Brian Jet-Fei Wong M.D.; Justus F. R. Ilgner M.D.; Bodo E. Knudsen M.D.; E. Duco Jansen; Steen J. Madsen; Guillermo J. Tearney; Bernard Choi; Haishan Zeng; Laura Marcu, Editor(s)

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