Annotated, stabilized video during our first semiofficial session tracking the gaze behavior of a freely-moving nonhuman primate. We were interested in how lemurs, a rather distant relative of humans, use social information to guide eye movements.

Here Aracus, a male ringtailed lemur, shares the indoor portion of his indoor-outdoor enclosure with a female. Both lemurs explore similar areas of the visual scene, Aracus sometimes following and sometimes leading. Aracus's scanpath is illustrated in red, environmental anchors are marked in blue, and the female lemur has been left unmarked for clarity.

red = gaze trace (where the lemur is looking)
blue = stable environmental features

For more information, please see:

"Noninvasive telemetric gaze tracking in freely-moving socially-housed prosimian primates."
Shepherd SV, Platt ML.
Methods 38(3):185-194, 2006.
dx.doi.org/10.1016/j.ymeth.2005.12.003

"Spontaneous social orienting and gaze-following in ringtailed lemurs (Lemur catta)."
Shepherd SV, Platt ML.
Animal Cognition 11(1):13-20, 2008.
springerlink.com/content/0q44522007368031/