Forex is a trade which is designed by many signals but the real goal is attained if the trader follows the simplest signals set by their own experience. It is an old proverb which says that machines can never be superior then humans. The same saying goes with forex. Although a set of people follows the signal dictated by machines but manmade suggestions had beaten the machine for many times successfully. The basic difference between both of them is that machine signals are based on researches where as human signals are inspired by their own knowledge and experience. It is totally up to your mind frame that which set you want to follow.