Each cage had distinct flooring materials, artificial smells and different lighting.
As the mice scouted out (侦查) the new room, whichever neurons were activated produced the special lightsensitive protein.
Next, the mice were moved to the second cage. This time, as the mice explored, the scientists used light to turn on the neurons
that
had been
activated
in
the
first
cage
and simultaneously shocked the mice. Then the mice were put back in the first cage. The mice were clearly fearful of the environment, graduate student, Steve Ramirez says, spending more than a quarter of their time frozen in place. “We were astonished that this worked on the very first mice we ever tried,” he says. “We got the animal to be scared of all environments where technically, nothing bad had ever happened to it.”
By contrast, when the mice were put in the third cage that they'd never been in before, they exhibited no fear. And in a control group of mice that had received shocks in the second cage but no neuron reactivation, the first cage did not cause fear.
After the experiment, the researchers tried to identify which neurons in the brain had been responsible for evoking the memory of the first cage. The neurons, they found, were located in the dentate gyrus (齿状圆), part of the hippocampus (海马区).This area has previously been implicated in the formation of memories, and is one of the areas of the brain with the most new neuron generation during adulthood.
【【创新方案】2017届高考英语二轮复习专题滚动检测:8(含解析)】相关文章:
★ 2017届高考英语二轮复习书面表达限时测验:7(含解析)
★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练:第12组(含解析)
★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练:第4组(含解析)
★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练:第15组(含解析)
★ 2017届高考英语二轮复习书面表达限时测验:2(含解析)
★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练:第10组(含解析)
★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练:6(含解析)
★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练:第16组(含解析)
★ 2017届高考英语二轮复习书面表达限时测验:6(含解析)
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21