Research on mortality has shown, for example, that not only is there a change in parent populations with age, but there are also changes within individuals related to approaching death. Gerontologists such as Kleemeier, Jarvik, Klaus and Ruth Riegel, Eisdorfer, and others have reported an acceler-
a ted rate of change in behavior during the last few years before "natural" death (for example, Jarvik, Blum, & Varma, 1972; Riegel & Riegel, 1972). The phenomenon has been referred to as terminal drop. Note, however, that changes occurring just before death can also be increases, such as an increase in death anxiety.