“…Similarly, psychologists have attempted to define theoretical terms such as fear by connecting them to stimulus, response, and other theoretical terms. However, while different measurements of G in different situations resulted in the same value, measurements of fear in different situations resulted in different behavioral indexes, which aroused contradictory theoretical interpretations (e.g., Rakover, 1975Rakover, , 1980Schwartz, 1989). Furthermore, the attempt to grasp consciousness as a theoretical term (that cannot be observed directly and is defined in terms of its relations with stimuli, responses and other theoretical terms) is problematic.…”