More broadly, across languages, negation markers tend to shift over time, in a process known as "Jesperson's Cycle".  As a more familiar example, the French negation "ne....pas" historically involved only the word "ne", with "pas" added for emphasis; but over time, "pas" became the true marker of negation and "ne" became redundant and optional.  In Lulogooli, a similar process seems to be taking place, with multiple different negation markers co-occurring redundantly and patterning differently in older texts compared to the present day.

In sum, Dr. Pak introduced students to the idea of fieldwork on under-studied languages (possible in a global city of immigrants such as Atlanta!) and revealed interesting patterns across languages and across time in the expression of negation ("not").