These factors are considered when determining the rate of natural increase. birth death emigration immigration user: when determining the "projected population change," a negative percentage indicates the population is expected to decline.
I believe the answer is: Grief
In psychology, grief refers to the process of coping with the overwhelming emotions that created when we loss someone that we care about.
During this process, most individuals would most likely unable to use the social and cognitve skills normally, which would affect their overall behavior