Psychoacoustics, which connects acoustics with psychology, is the study of how the mind reacts to different sounds. This field of study is especially important to consumer product manufacturing, because a consumer associates particular sounds with certain products or sensations. For example, people associate low-frequency rumbling sounds with power and torque, while higher-frequency sounds often represent high speeds and out-of-control occurrences. Psychoacoustics can play a major role in the development and commercial success of many products.