sodium amytal test: anesthetize one hemisphere and check for language function dichotic listening test: report more digits heard by dominant half functional brain imaging: fMRI or PET used to see which half is active when performing a language test
The process of change by which new species develop from preexisting species over time? The process by which species change over time is evolution. The process by which new species develop from preexisting species over time is evolution.
Barriers to reproduction. Under the commonly used âBiological Species Concept' (Mayr 1942), the formation of new species involves the evolution of reproductive barriers to the production of viable offspring either before (pre-zygotic barriers) or soon after (post-zygotic barriers) mating.