Wanda is sitting in her bedroom studying for finals. She has her psychology, statistics, sociology, and biology textbooks all lying on her bed as she is reading and taking notes from her history textbook. It is a hot and sunny but windy day, and Wanda's window is open. She is becoming frustrated that the wind keeps slamming her bedroom door shut. Eventually, Wanda keeps her window shut because she is so irritated. Of course now her bedroom is getting much too warm which is adding to her frustration. This problem could be easily solved by propping the door open if Wanda were not experiencing ________.