We have seen in the last two chapters that attention to time and the spatial arrangement of sources of stimulation for marking time influence the perceived duration of a time interval. Moreover, as we will see in Chapter 23, emotion also has such an influence. Because the influences on perceived duration of attention, emotion, and space manifest themselves under different forms and are per se large research fields, a chapter is dedicated to each of these three issues. However, many other sources can cause temporal distortions, and some of these are briefly described next.