Hypothetical distance is another type of psychological distance described by construal level theory. In 1946, Solomon Asch directed one of the earliest known empirical studies of human construal. Perceptions are affected by construal level theory in almost all aspects of psychology. Cognitive psychologists have been perhaps the most preoccupied with the idea of construal. These grammatical systems play a role in the construal of meanings of different kinds. There is still current research trying to establish links between construal and self. We form categories depending on the use of the different construal levels. Studies are being conducted to see the relationship between construal and economics. There is a difference between self-construal and construal in a social atmosphere. People are more likely to act in this fashion when thinking in a high-level construal. Regret is also a large aspect of consumer behaviors that is affected by construal level. Essentially, "we create recurrence," or similar responses, through our "construal" of types. Memories can also be affected by different construal levels and distances.