Researchers Jonathan Flombaum and Dr. Laurie Santos, both from Yale University, have found that rhesus monkeys consider whether a competitor can or cannot see them when trying to steal food.
Working with semi-free-ranging rhesus monkeys on the island of Cayo Santiago in Puerto Rico, Flombaum and Santos set up a food competition game: Lone monkeys were approached by two human "competitors." Each competitor had a grape affixed to a platform by his feet. In each experiment, one of the competitors could see the monkey in front of them, but the other could not. For example, in Experiment 1, one of the competitors stood with his back to the monkey subject, while the other stood facing the subject. Monkeys in this experiment spontaneously chose to approach and steal a grape from only the competitor with his back toward the monkey. In five more experiments, the monkeys revealed similar preferences for an experimenter who could not see them, rather than one who could. Most notably, they reliably stole food from a competitor with only his eyes averted, rather than one facing perfectly forward, as well as an experimenter with a piece of cardboard over his eyes rather than one with cardboard over his mouth. Together, these results reveal not only that rhesus monkeys prefer to steal food from a competitor who cannot see them, but also that they know exactly how blocking or averting one’s eyes can render one unable to see. Thus, even without any training, these monkeys were able to accurately consider the visual perspective of others when deciding from whom to steal.
In previous studies, rhesus monkeys (and other primates) were thought to do no more than merely follow the gaze of others. Primates have typically failed in other, noncompetitive experiments that require surmising what other individuals know or see from where they are looking. In one famous case, for example, rhesus monkeys were unable to find food under a hidden location when the human experimenter who hid the food preferentially looked at the hidden location. These results suggest that competition-like situations may bring out the primates’ abilities more than experiments that don’t involve competition.
Heidi Hardman | EurekAlert!
The personality factor: How to foster the sharing of research data
06.09.2017 | ZBW – Leibniz-Informationszentrum Wirtschaft
Europe’s Demographic Future. Where the Regions Are Heading after a Decade of Crises
10.08.2017 | Berlin-Institut für Bevölkerung und Entwicklung
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems Holding GmbH about commercial use of a multi-well tissue plate for automated and reliable tissue engineering & drug testing.
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems...
Pathogenic bacteria are becoming resistant to common antibiotics to an ever increasing degree. One of the most difficult germs is Pseudomonas aeruginosa, a...
Scientists from the MPI for Chemical Energy Conversion report in the first issue of the new journal JOULE.
Cell Press has just released the first issue of Joule, a new journal dedicated to sustainable energy research. In this issue James Birrell, Olaf Rüdiger,...
12.09.2017 | Event News
06.09.2017 | Event News
06.09.2017 | Event News
19.09.2017 | Earth Sciences
19.09.2017 | Materials Sciences
19.09.2017 | Physics and Astronomy