How are trade routes shown on this map

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.

is there answer choices?

no because it could make the world a terrible place to live in.

answer; decipher the motives for why people behave the way they do;