eLife Assessment
This study establishes a methodology (machine vision and gaze pose estimation) and behavioral apparatus for examining social interactions between pairs of marmoset monkeys. It has been difficult to study social interactions using artificial stimuli rather than genuine interactions between unrestrained animals. This study makes a fundamental contribution to social neuroscience research in a laboratory setting. Their results are convincing showing that the study of unrestrained social interactions is possible with detailed quantification of position and gaze. The methodology presented here is relevant to research in social neuroscience, neuroethology, and primatology.