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Phasic Firing in Dopaminergic Neurons Is Sufficient for Behavioral Conditioning ドーパミン作働性神経細胞の一時的な(phasic)発火は行動の条件付けにおいて十分な役割を果たしている |
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AbstractNatural rewards and drugs of abuse can alter dopamine signaling, and ventral tegmental area (VTA) dopaminergic neurons are known to fire action potentials tonically (<10 Hz) or phasically (15 to 30 Hz) under different behavioral conditions. However, without technology to control specific neurons with appropriate temporal precision in freely behaving mammals, the causal role of these action potential patterns in driving behavioral changes has been unclear. We used optogenetic tools to selectively stimulate VTA dopaminergic neuron action potential firing in freely behaving mammals. We found that phasic activation of these neurons was sufficient to drive behavioral conditioning and elicited dopamine transients with magnitudes not achieved by longer, lower-frequency spiking. These results demonstrate that phasic dopaminergic activity is sufficient to mediate mammalian behavioral conditioning. 10.1126/science.1168878 マウス深部脳の神経細胞における高周波パルス様活動電位はドーパミン放出を促進し、 報酬関連行動を惹起する。
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