From the information that has been provided in the question, the theory being described by Janelle is the frequency theory.
The frequency theory simply states that when a particular sound is heard by a person, information about the sound heard will be carried by pulses to the auditory nerve, so that the brain can process such sounds. It should be noted that the rate of the pulse would match the particular sound the person is hearing.
85% - 95% of Native Americans have died due to disease from Europe, with Europeans exploring the New Continent, and animals being brought over from Europe, most couldn't fight the diseases.
Jemison started The Jemison Group, Inc. a technology consulting firm integrating critical socio-cultural issues into the design of engineering and science projects, such as satellite technology for health care delivery and solar dish Stirling engine electricity in developing countries