What type of communication occurs between two or three people in which the messages exchanged significantly influence their thoughts, emotions, behaviors, and relationships?

interpersonal communication

Explanation:This is a communication that occurs between two or more people in order to exchange ideas and share opinions.

This is the type of communication that occurs for example at work during the morning time when employees are starting the day and they want to share ideas on how the day will go.

Ideas are shared , discussed amongst each other and the message is passed across everyone who is there .

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.

you answered your own : -/