Nodding frequency is obtained by tracking head movements.

点头频率特征是通过跟踪头部运动获得的。

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The computer captures voice and tracks the operator's face and head movements.

计算机捕捉操作者的声音，脸部表情及头部动作。

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Buddy can also detect, recognize and track objects and faces, as well as hear, speak, see and make coinciding head movements.

好友也可以检测，识别和跟踪物体和面孔，以及听，说，看，并一致头部运动。

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They differ from so-called 'locked-in' patients whose brain function is intact but are paralysed and communicate usually through eye or small head movements.

BBC: Finding a voice for the brain injured

Unfortunately, one of the ways that listeners check out a space audibly is by making small, unconscious head movements, which head-related transfer functions cannot imitate.

ECONOMIST: How to reproduce the ambiance of a live concert in the home

The team hopes to conduct further work to explore the detailed function of the head movements, and how ants may sense and perceive carrying unequally balanced objects.

BBC: Earth News - Ant's head balancing act revealed by video