Driving fast-spiking cells induces gamma rhythm and controls sensory responses.

Driving fast-spiking cells induces gamma rhythm and controls sensory responses.
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DOI:
10.1038/nature08002
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发表时间:
2009-06-04
期刊:
影响因子:
64.8
通讯作者:
Moore, Christopher I.
Moore, Christopher I.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Cardin, Jessica A.;Carlen, Marie;Meletis, Konstantinos;Knoblich, Ulf;Zhang, Feng;Deisseroth, Karl;Tsai, Li-Huei;Moore, Christopher I.

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Cortical gamma oscillations (20–80 Hz) predict increases in focused attention, and failure in gamma regulation is a hallmark of neurological and psychiatric disease. Current theory predicts that gamma oscillations are generated by synchronous activity of fast-spiking inhibitory interneurons, with the resulting rhythmic inhibition producing neural ensemble synchrony by generating a narrow window for effective excitation. We causally tested these hypotheses in barrel cortex in vivo by targeting optogenetic manipulation selectively to fast-spiking interneurons. Here we show that light-driven activation of fast-spiking interneurons at varied frequencies (8–200 Hz) selectively amplifies gamma oscillations. In contrast, pyramidal neuron activation amplifies only lower frequency oscillations, a cell-type-specific double dissociation. We found that the timing of a sensory input relative to a gamma cycle determined the amplitude and precision of evoked responses. Our data directly support the fast-spiking-gamma hypothesis and provide the first causal evidence that distinct network activity states can be induced in vivo by cell-type-specific activation.
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