However, these patients also experienced other symptoms after the communication pathway between the two sides of the brain was cut. For example, many split-brain patients found themselves unable to name objects that were processed by the right side of the brain, but were able to name objects that were processed by the right side of the brain. Based on this information, Sperry suggested that language was controlled by the left side of the brain (Springer and Deutsch 35).
Given the popularity of the idea of "right brained" and "left brained" thinkers, it may surprise you to learn that this idea is one of many myths about the brain leftover from this early research. However, there is possibly some truth to this myth. Theories of the functions of the brain hemispheres continue to evolve to help us understand how our minds work, and if our brains and biology do in fact influence who we are and how we learn as people.
Ned Herrmann, the "Father of brain dominance technology," drew on the work of Sperry and developed the brain dominance theory that attempts to prove that people develop preference to a way of thinking that eventually becomes dominant (Springer and Deutsch 45). This ranges from an analytical "left brain" approach to "right brain" approaches involving pattern matching and intuitive understanding. .
According to the theory, these preferences have their roots in our genetic makeup, and it affects our underlying cognitive capabilities (Springer and Deutsch 47). For example, left-right handed preferences have been observed in the womb. According to the theory, as we develop we tend to respond with our strongest abilities as these lead to quicker short-term rewards. This can create a positive feedback system that will strengthen those abilities. Eventually this can lead to a powerful preference for one style over the other and a dislike and discomfort for other modes of thinking (Springer and Deutsch 48).