When parents change their emotional expressions in response to infants' emotional expressions, infants also modify their emotional expressions in response to their parents' emotional expressions. This process is

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.

answer; ///approx///5,000 miles;

answer; thin-slice judgments;