21.18: Chapter 18
( \newcommand{\kernel}{\mathrm{null}\,}\)
Multiple Choice
1. a
3. a
5. c
7. d
9. b
11. a
13. a
15. b
17. d
19. b
21. a
23. a
Fill in the Blank
1. Sensory
3. Habituation
5. place