104. One kind of brain-scanning device is used by doctors to monitor normal as well as abnormal activity in a patient's brain. The device provides precise measurements of blood flow in the brain, a known indicator of how the brain is working. Unfortunately, the device requires patients to remain completely still with their heads in the scanning machine, which makes a very loud noise. Under these uncomfortable conditions, it is doubtful that doctors can get accurate measurements. A new head-mounted device that measures eye movements rather than blood flow and allows patients to move around will undoubtedly provide better brain measurements. Thus, the new head-mounted device should replace the older device at all hospitals and research institutions.
1. The writer claims that the new head-mounted device should replace the older device at all hospitals and research institutions.
2-1. The accuracy of the new head-mounted device is not proven.
2-1-a. The brain-scanning device directly scans the brain's blood flow, so it can show the brain activity in eye. On the other hand, the new device has to measure the eye movements and there have to be a inference step between the measurements and detection of abnormal activities in the brain.
2-1-b. The uncomfortable conditions, like noise and immobile status doesn't say that the device is inefficient. The activity of the brain is unconscious so the environment will not be annoying to the brain activity.
2-2. Replacing the older devices of all hospitals and research institutions is not necessary.
2-2-a. The cost of the new head-mounted device can be expensive.
2-2-b. Some research institutions and hospitals may need the older device for research issue or diverse information about the patient.