Victimology of Mass Shootings and Mass Murders Not Involving Firearms.

Most research to date has focused on perpetrators of mass murder incidents. Hence, there is little information on victims. We examined 973 mass murders that occurred in the United States between 1900 and 2019 resulting in 5,273 total fatalities and 4,498 nonfatal injuries for a total of 9,771 victims (on average 10 victims per incident).

Temporal relationship between onset of positive and negative symptoms in the course of attenuated psychotic illness.

Research in individuals at clinical high-risk (CHR) for psychosis has traditionally focused on the relationship between the severity of positive and negative symptoms and development of syndromal psychosis. In this study, we examined the temporal order of emergence of positive and negative symptoms in 116 CHR individuals who met criteria for the Attenuated Positive Symptom Syndrome defined in the Structured Interview for Psychosis-Risk Syndromes (SIPS). We found that positive symptoms emerged at a significantly younger age than negative symptoms with no significant differences between converters and non-converters.