Download Dissociated Vertical DivergencePerceptual Correlates of the Human

From: Dissociated Vertical DivergencePerceptual Correlates of the Human Dorsal Light Reflex
Arch Ophthalmol. 2002;120(9):1174-1178. doi:10.1001/archopht.120.9.1174
Figure Legend:
In the fish, increasing luminance to the right eye by shining a light from the 1-o'clock position (as seen by the animal) shifts
subjective vertical clockwise toward the 1-o'clock position(as seen by the animal). Visual objects aligned with the gravitational
vertical are therefore misregistered as being tilted counterclockwise toward the 11-o'clock position relative to the animal's subjective
vertical. A, Vertical objects and the animal's body are subjectively misregistered as being tilted counterclockwise, necessitating a
clockwise body tilt toward the body position thatCopyright
is necessary
for American
equal binocular
© 2002
Medicalvisual input. B, When a corrective body tilt is
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of download:
5/10/2017
prevented,
the ocular
component of this righting reflex
evokes
a
vertical
divergence
of the eyes to rotate the interpupillary axis
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toward a position that is perpendicular to the altered subjective vertical.
From: Dissociated Vertical DivergencePerceptual Correlates of the Human Dorsal Light Reflex
Arch Ophthalmol. 2002;120(9):1174-1178. doi:10.1001/archopht.120.9.1174
Figure Legend:
Visual tilt evoked by monocular occlusion in the strabismic human with dissociated vertical divergence. Gray image of the pencil
denotes perceived visual tilt immediately following occlusion of one eye. Curved arrows denote the perceived rotation of the tilted
visual image back to vertical, coinciding with the appearance of dissociated vertical divergence. On occlusion of either eye, the
vertical pencil positioned in the sagittal plane is perceived as instantaneously tilted, with its upper pole tipped toward the side of the
covered eye. This subjective visual tilt is quicklyCopyright
followed ©
by2002
a perceived
Americanrotation
Medicalback to vertical that coincides with the cyclovertical
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of download:
divergence
of the 5/10/2017
eyes.
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From: Dissociated Vertical DivergencePerceptual Correlates of the Human Dorsal Light Reflex
Arch Ophthalmol. 2002;120(9):1174-1178. doi:10.1001/archopht.120.9.1174
Figure Legend:
Depiction of perceived visual tilt following monocular occlusion in patients with dissociated vertical divergence. SV indicates the
subjective vertical (the patient's internal representation of vertical). A perceived tilt of the visual environment (a tilt of the subjective
visual vertical) is determined by the position of vertical objects in the visual world relative to the internal representation of vertical (ie,
relative to the subjective vertical). Left, Occlusion of the left eye evokes a monocular tilt in the subjective vertical. Since the visual
environment is perceived in relation to the tilted Copyright
subjective©vertical,
which the
patient perceives as vertical, the monocular visual
2002 American
Medical
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of download:
5/10/2017
environment,
as viewed
with the right eye, is now Association.
perceived asAlltilted
counterclockwise
relative to the patient's subjective vertical.
rights reserved.
Right, The human dorsal light reflex is a twofold movement consisting of a primitive vertical divergence, which realigns the