Wada test
A test to determine which hemisphere is language dominant in an individual. It is performed with an injection of sodium amytal which deactivates the ipsilateral hemisphere. If this happens to be the language dominant hemisphere, speech should be affected. (neurolinguistics)
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Wave Model
A way of representing language change using intersecting circles. This model emphasizes the interaction of neighboring languages with specific innovations spreading outward from a common source. (historical)
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