HRTF describes how a given sound wave input (parameterized as frequency and source location) is filtered by the diffraction and reflection properties of the head, pinna, and torso, before the sound reaches the transduction machinery of the eardrum and inner ear (see auditory system).
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The associated mechanism varies between individuals, as their head and ear shapes differ.
The Hutchens device is a device for protecting race car drivers in the event of an accident by controlling head movement, reducing head and neck injuries due to whiplash.
Billauer suffered an accident at the age of 17 on March 25, 1996, hitting his head on a shallow sandbar after being knocked off his surfboard by a wave.
Keepie uppie, or "kick-ups" is the skill of juggling with a football using feet, lower legs, knees, chest, shoulders, and head, without allowing the ball to hit the ground.
When his head was given to Nero by a freedman, Nero mocked how frightening the long nose of Plautus was.
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Between Moyenneville and Ablainzevelle, France, when the enemy attacked Second Lieutenant Horsfall's centre platoon, his three forward sections were driven back and he was wounded in the head by enemy fire.
On July 19, 1983, M. Vannier (Mallinckrodt Institute of Radiology, St. Louis) and his co-workers J. Marsh (Cleft Palate and Craniofacial Deformities Institute, St. Louis Children's Hospital) and J. Warren (McDonnell Aircraft Company) published the first three-dimensional reconstruction of single CT slices of the human head.