One of the five known hepatitis viruses that can infect humans is hepatitis E virus (HEV). The first documented infection that was caused by HEV occurred in 1955 during an outbreak in New Delhi, India (1). HEV is a small nonenveloped particle that belongs to the family Hep-eviridae and the genus Hepevirus. Its single-stranded RNA genome has approximately 7200 base pairs (2). By genomic sequence...

Four experiments were conducted to assess whether or not rhesus macaques (Macaca mulatta) could represent the unperceived movements of a stimulus. Subjects were tested on 2 computerized tasks, HOLE (monkeys) and LASER (humans and monkeys), in which subjects needed to chase or shoot at, respectively, a moving target that either remained visible or became invisible for a portion of its path of mo...