PET is also a very useful tool for investigating cognitive functions (for example, language, conscience, learning, sensory processing, etc.). For example, the Wada Test is used to check language and memory functions. The subject receives an injection of a short-acting barbiturate, amobarbital, injected into one of the carotid arteries. The hemisphere of the same side of the injection is inactivated, and the language and memory tests are performed. As the image in the right shows, only one hemisphere is activated.
Finally, two last examples of PET capabilities: