These selectively affect different mental processes because they act on the brain in different brain systems. Small amounts of psychologically active chemicals can be injected into small parts of the brain. These experimental ways have helped identify the location and function of brain systems that carry out the effects of these chemicals. Through electrical stimulation, we can only stimulate the desired part of the brain.
The advances in technology have made it possible to study the internal work of the brain without having to cut into an individual’s skull. The brain scanning is the mechanical and electrical measurements of the specific activates of the brain. One example I am familiar with of a scanning technique is the MRI, or magnetic resonance imaging. It uses a magnetic field in which the individual’s head is put in place. The radio waves aimed in the brain cause certain atoms within the brain to emit signals which the computer picks up. These studying techniques can distinguish between closely related brain structures.
There are a variety of procedures that are used to study the functions of different areas in the brain. Some are old methods and “outdated,” and some are the most recent and frequently used. These methods help us to study the localization of the functional areas of the brain.