The answer to the crossword question “Subj. in experimental psychology is ESP” is ESP, which stands for extrasensory perception. Extrasensory perception is a controversial topic in psychology because it involves the ability to acquire information without the use of our five senses. Some people believe in the existence of ESP, while others remain skeptical due to a lack of scientific evidence to support this claim. In experimental psychology, researchers may conduct studies on ESP to determine whether or not it is a real phenomenon that can be scientifically proven or if it is simply a product of a person’s imagination.