Recent reports" have shown that experi­ mental retinal detachment in the owl monkey (Aotes trivirgatus) produced photoreceptor outer-segment degeneration, and that surgi­ cal reattachment of the retina returned the outer segments to a normal configuration. The owl monkey is a nocturnal animal possessing a predominantly rod retina and an area centralis but no fovea. Because of the importance of ...

The 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) primate models of Parkinson's disease (PD) reproduce most, although not all, of the clinical and pathological hallmarks of PD. The present contribution presents the possibilities offered by the MPTP monkey models of PD to readers with minimal knowledge of PD, emphasizing the diversity of species, route and regimen of administration, sympto...

Numerical superiority confers a competitive advantage during contests among animal groups, shaping patterns of resource access, and, by extension, fitness. However, relative group size does not always determine the winner of intergroup contests. Smaller, presumably weaker social groups often defeat their larger neighbors, but how and when they are able to do so remains poorly understood. Models...

Primates are increasingly being tested individually in purpose-built research centers within zoos. The voluntary nature of research testing indicates that participation is enriching for the primate subjects, but previous studies have generally focused only on stress-related behavior, indicating that the research does not have a negative effect. Few data are available on the effects that individ...

THE illustration (Fig. 1) shows the busy harbour of Siros (then called Syra) in 1837. The island lies at the centre of the Cyclades group, south-east of Athens. During the War of Greek Independence in the 1820s, it had remained neutral and had greatly benefited through increased trade and from the many refugees who settled there. The town was divided into two: the old Roman Catholic upper town,...

A novel type D retrovirus was isolated by cocultivation of explants of fibromatous tissue from a rhesus monkey (Macaca mulatta) with immunodeficiency and retroperitoneal fibromatosis. This type D virus, isolated from a macaque with simian acquired immunodeficiency syndrome (SAIDS-D/Washington), is exogenous and is partially related to the Mason-Pfizer and the langur monkey type D viruses. The S...

Many object-related actions can be recognized by their sound. We found neurons in monkey premotor cortex that discharge when the animal performs a specific action and when it hears the related sound. Most of the neurons also discharge when the monkey observes the same action. These audiovisual mirror neurons code actions independently of whether these actions are performed, heard, or seen. This...

In the delayed match-to-sample task, responses of inferior temporal neurons to adjacent stimuli in the sequence are correlated to each other when the monkey was trained repeatedly with the sequence of visual stimuli, although the monkey was not required to associate the stimuli with each other. This correlation, however, is not observed for a monkey with lesions of the rhinal cortex, which is n...

Many cases of Toxoplasma gondii infection have been reported worldwide in non-human primates (NHPs), especially captive New World monkeys. However, few studies on toxoplasmosis Old monkeys conducted. In this study, serological and molecular biological analyses were carried out to look for T. antibodies 13 NHPs from China. was confirmed 8 NHP cases. detected 1/5 4/7 DNA 3/5 5/7 The one ring-tail...

Monkey pox is one of the most rare disease caused by infection monkey virus; source still remained unknown. It was discovered in 1958 where there an outbreak small-pox like disease. At that time were kept to further analyze. In 1970, first instance monkeypox a human noted. Monkeypox cases have now been documented number other central and western African nations. Prior 2022 outbreak, almost all ...