Crowding and stress: 1. Review of variables and theories

Recent empirical research has sometimes failed to support the existence of a direct causal link between human crowding, as measured by objective density indices, and stress effects. It has even been proposed that high density merely intensifies reactions due to other causes, thereby casting basic doubt on the reality of crowding-induced stress. Conceptual issues in crowding research are discussed, and an attempt is made to resolve definitional problems. Theories of crowding are reviewed, suggesting that any plausible theory of crowding effects must take seriously the cognitive mediation of environmental variables, plus the operation of a complex set of personal and interpersonal processes which will determine whether and when high densityis likely to result in stress. These considerations cast doubt on the generalizability of that research which has failed to demonstrate crowding stress effects, and highlight the need for an integration of existing theories, so that predictions of the circumstances where crowding stress is most likely can eventually be made with greater precision.