... on animals. Disadvantages: The biggest disadvantage of this method is that the actual tests are not carried out on humans. Although humans and other mammals have many similarities, they also have many differences. Thalidomide was a drug that was tested on rabbits, where the results were perfectly fine. However, when they were used by pregnant women, their babies were affected by the drug. Another disadvantage is that when the tests are done on humans, their brains are already damaged. That means that the researchers won't be able to damage one particular part of the brain. Sometimes, this method is criticized for not looking at natural behaviour of people. Some psychologists even suggest that this method doesn't explain much at all, and there probably are other factors involved. Non-Invasive Method There are two main different ways of non-invasive methods; EEG and Brain Scanning. These methods don't involve any entering of the brain, but rather scanning ...

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