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Previous research in environmental psychology and consumer behavior has demonstrated mostly negative effects of human density on consumer experience in retail settings. The effects of spatial density, however, have received scant attention. Results from previous studies show that retail density affects shoppers' emotional and behavioral responses through perceived control. Work in social psychology, however, indicates that there are differences in the extent to which people strive for control, suggesting that having control in retail settings may be more important to some consumers than to others. In the experimental study reported in this paper, the effects of both forms of retail density were studied as a function of consumers' desire for control. Results indicate that the effects of human and spatial density vary with consumers' desire for control. Theoretical and managerial implications are discussed.

However, evidence on the extent to which lighting affects the school performance of young children is sparse. This paper evaluates the effect of lighting conditions (with vertical illuminances between 350 lux and 1000 lux and correlated colour temperatures between 3000 and 12 000 K) on the concentration of elementary school children in three experiments. In the first two experiments, a flexible and dynamic lighting system is used in quasi-experimental field studies using data from 89 pupils from two schools (Study 1) and 37 pupils from two classrooms (Study 2). The third experiment evaluated two lighting settings within a schoolsimulating, windowless laboratory setting (n ¼ 55). The results indicate a positive influence of the lighting system on pupils' concentration. The findings underline the importance of lighting for learning. Several suggestions are made for further research.

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