Here is a question if you want to answer

Four-fifths (80%) of Central America's population is Roman Catholic. Most of the remainder is Protestant, though a number of people practice Mayan and other indigenous religions, sometimes concurrently with Roman Catholicism.

answer; the basal forebrain;

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.