1 . Black taxis have been a common sight in London for many years. Now these taxis and their drivers have become the focus of a new study into Alzheimer’s (阿尔兹海默症). For those on the outside, it may seem that behind the wheel of these black taxis are just common people who help move us to our places. But hidden within their brains is a map of London’s streets that has put GPS technology to shame for many years.
“The knowledge”, the test for London’s taxi drivers, stands among the hardest tests one could ever experience. It includes remembering information repeatedly from the memory of minute details about between 25,000 and 56,000 streets in London, depending on who’s taking the test, from the Trafalgar Square to the tiniest residential lanes (居民巷).
Usually, the hippocampus (海马体) feels the influences of Alzheimer’s most. The hippocampus controls the brain’s short-term memory and spatial memory (空间记忆) systems. University College London and Alzheimer’s Research UK are coming together to study these taxi drivers’ brains. And the taxi drivers’ hippocampi continue to grow as they go on doing the job for more years. This suggests that perhaps there’s something we can do to reproduce the influence on the general population.
Lead researcher Hugo Spiers was part of the team which 20 years ago found that, like birds’, the taxi drivers’ hippocampi slowly got bigger. In fact, research has found for years that any animal that requires detailed spatial knowledge of their land experiences growth in the hippocampus.
Spiers’ team hopes to deal with Alzheimer’s by studying the taxi drivers’ brains, since the hippocampus becomes smaller with the development of Alzheimer’s. To collect more information, Spiers has asked thirty London’s taxi drivers connected to an MRI machine to drive around. The machine will allow the researchers to keep a real-time watch on the workings of the hippocampus. “It’s been a joy to help scientists fight the disease,” said taxi driver Robert Lordan.
1. What can we learn about “The knowledge”?| A．It lasts for a few minutes only. | B．It invites some residents to be testers. |
| C．It is a great challenge to people’s memory. | D．It is usually held in London’s busy streets. |
| A．They are improved thanks to daily talks. | B．They grow together with taxi drivers’ job. |
| C．They fail to control short-term memory. | D．They are more likely to be influenced. |
| A．Animals’ hippocampi are quite different from humans’. |
| B．The new study can do good to animals as well. |
| C．More detailed studies on animals’ brains are needed. |
| D．Animals’ hippocampi are similar to humans’. |
| A．To decide who has the largest hippocampus. |
| B．To find out what their hippocampi are doing at work. |
| C．To know how Alzheimer’s develops in their brains. |
| D．To test whether the machine influences the hippocampus. |
