What’s the News: Researchers have simulated the symptoms of schizophrenia using a language-learning computer program, in a recent study published in Biological Psychiatry. The computer started showing schizophrenia-like symptoms when it was set to learn too much and forget too little. This study lends support to the hyperlearning hypothesis, that the brains of people with schizophrenia have trouble forgetting or filtering out irrelevant information.
A new model of crowd behavior uses simple visual rules.
What’s the News: When crowds go wrong, they go really wrong—more than 300 people died in a stampede in Cambodia last year during a festival, and hundreds more have been crushed to death in periodic disasters near the Muslim holy city of Mecca. A major flaw of computational models describing how people behave in crowds is that they are often too simplistic or too specific to a situation to explain both normal and disastrous behavior. A new model manages to recreate both types of behavior, working from two basic visual rules: (1) each person will move in the least crowded direction in their line of sight, and (2) they will adjust their speed to maintain a safe distance from visible obstacles.
“This work is an extremely important step in pulling together our fragmented understanding,” says behavioral biologist Iain Couzin, who was not involved in the study (via ScienceNOW). “We’re now approaching a sort of unified understanding of human behavior in crowds.”