The late 20th century was also when they began using computational models of cognition. The psychologists would make theories and install them into a computer, then virtually damage the fake brain where the patient had damage. By doing this, they can get a better look at how the mind works. This is one way that technology has helped in studying the human mind. This, along with the invention of the devices to scan the brain, has made a big difference in cognitive neuropsychology.