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. 2016 Jun 21;63(1):85–95. doi: 10.1093/cz/zow066

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© The Author (2016). Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 1. — The double closed-loop teleprompter apparatus. Two teleprompters enabled live social interaction over a video interface, allowing each subject to be filmed from a hidden camera placed behind the live video image of the other subject. Black dotted and long-dash grey lines denote the course of visual information flow through the video channel from 1 bird to the other in either direction. The video camera inside the teleprompter films 1 pigeon off a mirror and through a pane of 1-way glass. The video then streams into the teleprompter apparatus of the other subject, as well as into the control room where the experimenter can observe.