Wujec talks about three main parts of the brain that stimulate meaning for a piece of information: the ventral stream or the "what detector", the dorsal stream that puts things into a mental map so when you close your eyes you can visualize the space around you, and the limbic system which associates meanings or feelings to a piece of information. With that in mind to help best engage our students we must use visual stimulation because it is the most needed of our senses for learning. We, as teachers, must keep that information in the same place so that it is persistent and the students will always be able to place the information on a mental map. And we must also be able to add feeling to how the students learn the information. When information is connected to a strong feeling it is recalled very quickly.
Although vision is the most needed of our senses for learning (one usually cannot learn without reading or seeing the material) it is not the most critical otherwise blind children would become useless to the world. Other senses can be instrumental in how children learn. One of the best ways for children to learn is actually by stimulating multiple senses such as hearing and touching because that means that more of the brain is being activated and myelinated.
Stimulating multiple senses is ALWAYS good--for lots of reasons we've talked about. I don't think he's saying that vision is critical for learning, but that we are very visual creatures and it's typically our default sense--the one that is most salient to us--unless there is some obstacle (like lack of vision. At that point, other brain regions (like hearing) would take over the actual space that would have been devoted to vision. For people with vision, because almost all information is presented to us in some visual way, it becomes very strong and the typical method we use to interpret information.
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