When research participants were asked to repeat a message coming in one ear and ignore a message coming in the other ear, what were the researchers attempting to demonstrate scientifically?

The researcher is trying to demonstrate a scientific experiment called Dichotic  Listening

Explanation:

Dichotic listening is the listening to different acoustic events presented to each ear simultaneously. Most commonly, the acoustic signals are speech, such as digits, words, consonant-vowels, or sentences.

This test is used to carry out behavoural test of Central auditory processing which help to determine which ear (left ear or right ear ) has the best advantage in listening.

answer; ///i believe the state is (pennsylvania);

true

explanation:

agreeableness is a personality trait manifesting itself in individual behavioral characteristics that are perceived as kind, sympathetic, cooperative, warm, and considerate.