Question

A psychology professor decides to play a practical joke on a colleague in the history department. While the historian is giving a lecture on the first day of class, the psychology professor interrupts and asks to speak with her outside the classroom. While they are conversing, all of the students leave through a back door and are replaced with a completely new group of students. Upon returning, the history professor continues her lecture without noticing that the students are different, thus illustrating:

Answer 1

Answer: change blindness

Step-by-step explanation:

Change blindness occurs when there's a change in a visual stimulus and the observer isn't aware of the change.

Since the professor wasn't aware that the sets of students in the class gas been replaced by another set of students and continued teaching like nothing happened, then this is a change blindness.