Contrasting two versions of the 4-cup 2-item disjunctive syllogism task in great apes.

Chimpanzees excel at inference tasks which require that they search for a single food item from partial information. Yet, when presented with 2-item tasks which test the same inference operation, chimpanzees show a consistent breakdown in performance. Here we test a diverse zoo-housed cohort (n = 24) comprising all 4 great ape species under the classic 4-cup 2-item task, previously administered to children and chimpanzees, and a modified task administered to baboons.

Training primates to forage in virtual 3D environments.

Virtual environment software is increasingly being employed as a non-invasive method in primate cognition research. Familiar and novel stimuli can be presented in new ways, opening the door to studying aspects of cognition in captivity which previously may not have been feasible. Despite the increased complexity of visual input compared to more traditional computerised studies, several groups of captive primates have now been trained to navigate virtual three-dimensional environments.

Engagement in the HIV Pre-Exposure Prophylaxis Care Cascade in a Statewide Sample of Transgender and Nonbinary Individuals.

Although literature regarding HIV prevention among transgender and nonbinary (TNB) people has grown considerably, important gaps remain, particularly in relation to the HIV pre-exposure prophylaxis (PrEP) care cascade. Additional research is needed to understand when and why TNB people exit the PrEP care cascade to inform interventions to better support these populations. Moreover, most studies have focused on transgender women, though transgender men and nonbinary people also experience a disproportionate prevalence of HIV relative to cisgender populations.