The field of psychology is a very broad area with many smaller subfields. Each psychologist can specialise in any of these subdivisions through conducting research and through additional training. One of the most prominent and influential areas in psychology is experimental psychology. Experimental psychologists are interested in exploring theoretical questions, often by creating a hypothesis and then setting out to prove or disprove it through experimentation. They study a wide range of behavioral topics among humans and animals, including sensation, perception, attention, memory, cognition and emotion. Experimental psychologists use scientific methods to collect data and perform research. Certainly, all psychologists can be considered researchers, since research is at the very core of psychology.