The researchers speculate that maybe as frontal lobe activity decreases, "the areas of the brain that support mediumistic writing are further disinhibited (similar to alcohol or drug use) so that the overall complexity can increase." In a similar manner, they say, improvisational music performance is associated with lower levels of frontal lobe activity which allows for more creative activity.
We can assist them in contacting us by learning to increase and raise our energy — by doing so, we’ll help in the communication by meeting them halfway. So, to answer the question, no, I don’t believe that anyone can become a medium. Rest assured, if you have the gift of mediumship, it’s likely to present itself in its own way and in its own time. My last piece of advice with respect to this question is on a somber note. I do not recommend this as something that you should dabble with. It’s such a serious subject and one that requires both delicacy and tact.
After drawing your cards, revisit your initial question to ensure that it has been addressed properly. A good tarot guide can help you interpret the images you see on the tarot cards, but there’s really no substitute for personal reflection. As with any skill, practice makes perfect, so use this tarot tool often (daily, if possible), or order a set of Astrology Answers Master Deck Tarot Cards and practice at home!