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Visual perception of upright: Head tilt, visual errors and viewing eye.

Amir Kheradmand1,2, Grisel Gonzalez3, Jorge Otero-Millan1

  • 1Department of Neurology, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Journal of Vestibular Research : Equilibrium & Orientation
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Summary

Healthy subjects accurately perceive upright using the subjective visual vertical (SVV), regardless of viewing eye. Line rotation influences SVV, but this effect varies with head tilt, suggesting a lateralizing impact on visual perception.

Keywords:
Subjective visual verticalbinocularhead tiltline rotationmonocular

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Area of Science:

  • Neuroscience
  • Human Perception
  • Visual Science

Background:

  • Subjective visual vertical (SVV) assessment is crucial for understanding upright perception.
  • SVV is typically measured by aligning a luminous line to the perceived vertical.

Purpose of the Study:

  • Investigate the influence of visual line rotation and eye of viewing on SVV responses.
  • Examine how head tilt affects SVV responses to line rotation and viewing conditions.

Main Methods:

  • SVV measured via forced-choice paradigm in 22 healthy subjects.
  • Varied head positions (20° left/right tilt, upright), viewing eye (left, right, both), and line rotation (CW, CCW).

Main Results:

  • No significant difference in SVV accuracy/precision between viewing eyes across head positions.
  • Line rotation direction (CW/CCW) significantly affected SVV accuracy, with tilt matching rotation direction.
  • Line rotation effect was absent in left head tilt but present in upright and right tilt positions, showing higher variability in left tilt.

Conclusions:

  • Normal subjects demonstrate robust SVV perception irrespective of viewing eye, even with head tilt.
  • Asymmetry in line rotation's effect across head tilts suggests a potential lateralizing role of head tilt in visual upright perception.