In order to understand the difference between right- and left- dominant hemisphere individuals what linguistic experiments can we do?
In psychlinguistic research, practitioners use what is called dichotic listening technique whereby the subject under study receives different prompts through both ears simultaneously. The prompts played into each ear are different; therefore, the ability to recall prompts played into either the left or right ear determines dominance.
Reza's answer is correct. Other techniques include TMS and FMRI. Having said that, I must also tell you that the notion of right dominant vs left dominance for language has fallen into disfavor if not rejected altogether. It has always been a problematic concept in any casa, as both left handers and women were shown to be less dominant than right handed males. It's is difficult to sustain a theoretical construct that applies to less than half the population.
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