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

Identifieur interne : 000011 ( Main/Exploration ); précédent : 000010; suivant : 000012

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

Auteurs : Amir Kheradmand [États-Unis] ; Grisel Gonzalez [Mexique] ; Jorge Otero-Millan [États-Unis] ; Adrian Lasker [États-Unis]

Source :

Journal of vestibular research : equilibrium & orientation [ 0957-4271 ] ; 2016.

RBID : PMC:4890624

Abstract

BACKGROUND

Perception of upright is often assessed by aligning a luminous line to the subjective visual vertical (SVV).

OBJECTIVE

Here we investigated the effects of visual line rotation and viewing eye on SVV responses and whether there was any change with head tilt.

METHODS

SVV was measured using a forced-choice paradigm and by combining the following conditions in 22 healthy subjects: head position (20° left tilt, upright and 20° right tilt), viewing eye (left eye, both eyes and right eye) and direction of visual line rotation (clockwise [CW] and counter clockwise [CCW]).

RESULTS

The accuracy and precision of SVV responses were not different between the viewing eye conditions in all head positions (P > 0.05, Kruskal-Wallis test). The accuracy of SVV responses was different between the CW and CCW line rotations (p ≈ 0.0001; Kruskal-Wallis test) and SVV was tilted in the same direction as the line rotation. This effect of line rotation was however not consistent across head tilts and was only present in the upright and right tilt head positions. The accuracy of SVV responses showed a higher variability among subjects in the left head tilt position with no significant difference between the CW and CCW line rotations (P > 0.05; post-hoc Dunn’s test).

CONCLUSIONS

In spite of the challenges to the estimate of upright with head tilt, normal subjects did remarkably well irrespective of the viewing eye. The physiological significance of the asymmetry in the effect of line rotation between the head tilt positions is unclear but it suggests a lateralizing effect of head tilt on the visual perception of upright.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4890624

DOI: 10.3233/VES-160565
PubMed: 26890421
PubMed Central: 4890624

Affiliations:

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<affiliation wicri:level="2"><nlm:aff id="A2">Department of Otolaryngology-Head and Neck Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD, USA</nlm:aff>
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<front><div type="abstract" xml:lang="en"><sec id="S1"><title>BACKGROUND</title>
<p id="P1">Perception of upright is often assessed by aligning a luminous line to the subjective visual vertical (SVV).</p>
</sec>
<sec id="S2"><title>OBJECTIVE</title>
<p id="P2">Here we investigated the effects of visual line rotation and viewing eye on SVV responses and whether there was any change with head tilt.</p>
</sec>
<sec id="S3"><title>METHODS</title>
<p id="P3">SVV was measured using a forced-choice paradigm and by combining the following conditions in 22 healthy subjects: head position (20° left tilt, upright and 20° right tilt), viewing eye (left eye, both eyes and right eye) and direction of visual line rotation (clockwise [CW] and counter clockwise [CCW]).</p>
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<p id="P4">The accuracy and precision of SVV responses were not different between the viewing eye conditions in all head positions (<italic>P</italic>
 > 0.05, Kruskal-Wallis test). The accuracy of SVV responses was different between the CW and CCW line rotations (<italic>p</italic>
 ≈ 0.0001; Kruskal-Wallis test) and SVV was tilted in the same direction as the line rotation. This effect of line rotation was however not consistent across head tilts and was only present in the upright and right tilt head positions. The accuracy of SVV responses showed a higher variability among subjects in the left head tilt position with no significant difference between the CW and CCW line rotations (<italic>P</italic>
 > 0.05; post-hoc Dunn’s test).</p>
</sec>
<sec id="S5"><title>CONCLUSIONS</title>
<p id="P5">In spite of the challenges to the estimate of upright with head tilt, normal subjects did remarkably well irrespective of the viewing eye. The physiological significance of the asymmetry in the effect of line rotation between the head tilt positions is unclear but it suggests a lateralizing effect of head tilt on the visual perception of upright.</p>
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Visual perception of upright: Head tilt, visual errors and viewing eye

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

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