Molecular "light switches" can reveal exactly which neurons are involved in creating a memory, allowing scientists to trigger that memory using only light. The finding, presented at the Society for Neuroscience conference in Chicago this week, is just one example of how a novel technology called optogenetics is allowing scientists to tackle major unanswered questions about the brain, including the role of specific brain regions in the formation of memory, the process of addiction, and the transition from sleep to wakefulness.
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