期刊
JOURNAL OF NEUROBIOLOGY
卷 51, 期 3, 页码 237-247出版社
JOHN WILEY & SONS INC
DOI: 10.1002/neu.10056
关键词
laser; cortex; imaging; circuits; action potential
资金
- NEI NIH HHS [EY11787] Funding Source: Medline
- NINDS NIH HHS [NS40726] Funding Source: Medline
We pulsed the activation of neurons using a femtosecond laser. Pyramidal neurons are depolarized and fire action potentials when high intensity mode-locked infrared light irradiates somatic membranes and axon initial segments. This depolarization is reversible, does not occur with CW laser light, and appears to be due to multiphoton excitation. We describe two regimes of multiphoton optical stimulation. Low intensity, long duration laser irradiation produces a sustained depolarization, insensitive to sodium channel blockers yet sensitive to antioxidants. On the other hand, high intensity, short duration irradiation can induce fast depolarizations, which appear due to different mechanism. The combination of multiphoton stimulation and optical probing could enable systematic analysis of circuits. (C) 2002 Wiley Periodicals, Inc.
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