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Related Concept Videos

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If you want to understand how behavior occurs, one of the best ways to gain information is to simply observe the behavior in its natural context. However, people might change their behavior in unexpected ways if they know they are being observed. How do researchers obtain accurate information when people tend to hide their natural behavior? As an example, imagine that your professor asks everyone in your class to raise their hand if they always wash their hands after using the restroom. Chances...
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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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Gaze in Action: Head-mounted Eye Tracking of Children's Dynamic Visual Attention During Naturalistic Behavior
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Head postures during naturalistic driving.

Jason B Fice1, Jean-Sébastien Blouin1,2, Gunter P Siegmund1,3

  • 1a University of British Columbia , School of Kinesiology , Vancouver , British Columbia , Canada.

Traffic Injury Prevention
|June 27, 2018
PubMed
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Drivers make larger and longer head movements when stationary, increasing whiplash injury risk during rear-end impacts. These head postures during driving are crucial for understanding injury mechanisms.

Keywords:
Driver behaviorout of positionrear impactwhiplash

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Area of Science:

  • Biomechanics
  • Human Factors Engineering
  • Traffic Safety

Background:

  • A rotated head posture during rear-end impacts elevates the risk of acute and chronic whiplash injuries.
  • Understanding naturalistic head movements is key to mitigating whiplash trauma.

Purpose of the Study:

  • To quantify the amplitude and duration of head postures drivers adopt during naturalistic driving.
  • To compare head movement characteristics between stationary and moving vehicle conditions.

Main Methods:

  • Twenty volunteers drove a vehicle on public roads while their 3D head angular position was recorded using inertial measurement units.
  • Head movements (shoulder checks, mirror checks, passenger glances) were logged, and their duration and amplitude analyzed.
  • Head movement data were compared between stationary and moving vehicle states.

Main Results:

  • Drivers performed a median of 15-82.5 head movements per drive, with peak yaw angles reaching up to 84.3°.
  • A significantly larger proportion of time was spent in non-neutral head postures when stationary (17.5%) versus moving (8.2%).
  • Head movements were of greater amplitude when the vehicle was stationary compared to when it was moving.

Conclusions:

  • Drivers exhibit larger and longer head movements when stationary, correlating with increased whiplash injury risk in stationary vehicles during rear-end collisions.
  • Characterized head postures provide essential initial conditions for future research into non-neutral posture-related whiplash injury.
  • Findings offer insights into why stationary drivers face higher whiplash injury risks.