Noise is a ubiquitous feature of modern life that is frequently the cause of psychological irritation and stress. We conducted a series of experiments to probe various aspects of noise perception and annoyance. Sections 11.1 and 11.2 discuss experiments in a laboratory that were conducted for annoyance judgments of noise based on both the temporal and spatial factors of environmental noise. In Section 11.3, long-time effects of aircraft noise during pregnancy on postnatal reactions of babies during sleep were investigated. Results show a “prenatal habituation” of babies to aircraft noise, but not music. These differential responses might be explained by the temporal factors extracted from the ACF. In Section 11.4, effects of noise and music on two different mental tasks of children are discussed. Results of two different tasks could be related to the specialization of cerebral hemispheres.