Betty Edwards has used the terms L-Mode and R-Mode to designate two ways of knowing and seeing – the verbal, analytic mode and the visual, perceptual mode – no matter where they are located in the individual brain. You are probably aware of these different characteristics. L-mode is a step-by-step style of thinking, using words, numbers and other symbols. L-mode strings things out in sequences, like words in a sentence. R-mode on the other hand, uses visual information and processes, not step-by-step, but all at once, like recognizing the face of a friend.
“You have two brains: a left and a right. Modern brain scientists now know that your left brain is your verbal and rational brain; it thinks serially and reduces its thoughts to numbers, letters and words… Your right brain is your non-verbal and intuitive brain; it thinks in patterns, or pictures, composed of ‘whole things,’ and does not comprehend reductions, either numbers, letters, or words.” From The Fabric of Mind, by the eminent scientist and neurosurgeon, Richard Bergland. Viking Penguin, Inc., New York 1985. pg.1