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Verticality Perception Assessed by the Haptic Vertical

University of Zurich (UZH) logo

University of Zurich (UZH)

Status

Completed

Conditions

Healthy

Treatments

Other: changes in whole-body roll position and visual/haptic stimuli presented

Study type

Interventional

Funder types

Other

Identifiers

NCT02980432
shv_okn_study

Details and patient eligibility

About

The investigators previously shown that a rotating optokinetic stimulus results in shifts of the subjective visual vertical in healthy human subjects. However, the origin of these shifts is still poorly understood. Both torsional displacement of the eyes and a shift in the internal estimate of direction of gravity have been proposed as potential explanations. Here the investigators use a vision-independent setup to differentiate between these two hypotheses, predicting no impact of a rotating stimulus on the subjective haptic vertical if torsion triggers the shift.

Enrollment

19 patients

Sex

All

Ages

18 to 65 years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria

  • ages 18-65 years
  • informed consent
  • absence of exclusion criteria

Exclusion criteria

  • peripheral-vestibular deficit
  • disturbed consciousness
  • history of sensory deficits
  • visual field deficits
  • other neurological or systemic disorder which can cause dementia or cognitive dysfunction
  • intake of antidepressants, sedatives, or neuroleptics
  • pregnancy, unless excluded by a negative pregnancy test
  • known neck pain or status post neck trauma

Trial design

Primary purpose

Basic Science

Allocation

N/A

Interventional model

Single Group Assignment

Masking

None (Open label)

19 participants in 1 patient group

intervention arm
Experimental group
Description:
all participants will be assigned to the same arm. Interventions applied include presenting a visual line or a rod with or without a moving (rotating) background while being in different whole-body roll positions. Participants will be asked to adjust the line or the rod along perceived direction of gravity.
Treatment:
Other: changes in whole-body roll position and visual/haptic stimuli presented

Trial contacts and locations

1

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Data sourced from clinicaltrials.gov

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