Testing long term memory is easier than short term, long term memory by its nature is fixed in an area of the brain once you are 21=25 this area is fixed, before that age the long term area is used for other things and is one of the areas that gets a complete rewire at puberty.Once the memory center is fixed it can be imaged on a PET scanner, you are asked a series of questions and they look for evidence that he area fires when you answer.
Short term memory is different and the area of the brain responsible looks different, the only tests are the standard memory tests. These mainly look for ability to recall from long term memory, such as holding up a pencil and asking what it is. While a pencil is recalled from LT memory it is stored immediately in short term memory.
Short term memory is different and the area of the brain responsible looks different, the only tests are the standard memory tests. These mainly look for ability to recall from long term memory, such as holding up a pencil and asking what it is. While a pencil is recalled from LT memory it is stored immediately in short term memory.