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DA little brain stimulation at night appears to help people remember what they leamed theprevious day,a study of 18 severe epilepsy (patients has found.During sleep,brain cells fire in rhythmic patterns.When two brain areas synchronize (their firing patterns,they are able to communicate.During non-rapid eye movement sleep,thehippocampus,found deep in the brain,synchronizes its activity with the prefrontal cortex,which liesjust behind the forehead.This helps transform memories from the day into memories that can last alifetime.Dr.Itzhak Fried at the University of California and his team gathered 18 epilepsy patients whoalready had electrodes )in their brains for medical evaluation.This offered the scientists a wayto both monitor and ehange a person's brain rhythms.They used a "celebrity pet"test in whichparticipants were shown images matching a particular celebrity with a specific animal.The goal wasto remember which animal went with which celebrity.Patients saw the images before going to bed.While sleeping,some of them got tiny electricalstimulation through the wires in their brains.In patients who got the stimulation,rhythms in the twobrain areas became more synchronized.And when they woke up they scored higher on the test.The experiment was based on decades of research done by scientists,including Dr.GyorgyBuzsaki,a neuroscientist at New York University.But changing rhythms in healthy peoples'brainsmight not improve their memory,he says,because those communication channels are already inperfect condition.The epilepsy patients may have improved because they started out with sleep andmemory problems caused by both the disorder and the drugs used to treat it.Even so,he says,the approach has the potential to help millions of people with damagedmemory.And brain rhythms probably play parts in many other problems."They are not specific tomemory.They are doing a lot of other things,"Buzsaki.says,like regulafing mood and emotion.32.What is paragraph 2 mainly about?A.The forming process of memories.B.The working principle for the research.C.The analysis of brain cells'firing patterns.D.The advantages for studies in brain activities.33.Why were electrical stimulations delivered to some patients at night?A.To conduct their medical evaluation.B.To monitor their brain rhythms.C.To facilitate synchrony of their brain areas.D.To record scores of the memory tests.34.What can be expected of the approach proposed in the research?A.It will strengthen healthy people's memory.B.It may enhance people's-communication skills.C.It can help reduce epilepsy patients'drug use.D.It might help people with mental problems.高三英语试题第7页（共12页)