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. 2013 Jun 6;4:160. doi: 10.3389/fpsyg.2013.00160

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Copyright © 2013 Gillespie-Lynch, Greenfield, Feng, Savage-Rumbaugh and Lyn.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.

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Examples of a head-point gesture by an ape and a human. Head-point involves indicating an object by using one’s head. Left – Ape example: Sue shows Panbanisha (22 months, 27 days) a chain of keys and asks her to pick a key to open the door. Panbanisha touches the keys with her face/head. Sue opens the door. Right – human example: mom holds up finger puppet, saying “See it’s a baby.” She pretends to give it a bottle. GN (14 months, 1 day) laughs and head-points it. “Yeah it’s a baby,” Mom says.