During Carl's First Semester in College,he Walks Through His Student

Multiple Choice

During Carl's first semester in college,he walks through his student union building everyday on his way to classes.At the beginning of the semester,he easily gets distracted and stops to look at all the posters and to talk to all the groups giving out information about various causes.He was often late for class.However,by the middle of the semester,he would walk through the student union without even noticing the new groups and signs.Carl has likely created _____ to shield him from all the competing messages.

A) noise
B) feedback
C) mental files
D) perceptual screens
E) cognitive dissonance