Table 4. Description of experimental sessions with monochrome near-infrared video recording.

Session	Sensor	Frame rate, fps	Video resolution, pixels	Distance to monkey face, cm	Session duration, s	Pixel intensity range, n.u.
2	Kinect NIR	30	512 × 424	50	307	[0.39,0.99]
9	Chameleon, 10-30mm	100	1280 × 1024	30	133	[0.31,0.94]
10	Chameleon, 10-30mm	50	1280 × 1024	30	184	[0.31,0.94]