Effects of Prolonged Roll-tilt in Healthy Human Subjects

Adaptation Reaction Clinical Trial

Official title:

Erticality Perception - Effects of Prolonged Roll-tilt in Healthy Human Subjects

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT02980419
• Other study ID #: post_tilt_study
• Status: Recruiting
• Phase: N/A
• Start date: June 2016
• Est. completion date: May 31, 2020

Study information

• Verified date: December 2019
• Source: University of Zurich
• Contact: Dominik Straumann, MD
• Phone: +41442551111
• Email: dominik.straumann[@]usz.ch
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The long-term goal of this research is to advance the investigators knowledge of how the brain combines the information of multiple sensory systems coding for spatial oriention and how adaptation to vestibular imbalance influences spatial orientation. In healthy human subjects verticality perception is accurate while upright. After prolonged roll-tilt, humans show a systematic bias in perceived direction towards the previous roll-tilted position (so-called "post-tilt bias"). This effect could either be related to adaptation to the roll-tilted position (shifting the "null" position) or it could be related to changes in torsional eye position due to prolonged static roll-tilt (ocular counter-roll). While in the first case a post-tilt bias is predicted independently of the experimental paradigm used, the second hypothesis predicts a post-tilt bias only if retinal cues are integrated. In order to evaluate these hypotheses, the investigators will assess perceived vertical using both vision-dependent and vision-independent paradigms.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 20
• Est. completion date: May 31, 2020
• Est. primary completion date: May 1, 2020
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 65 Years

Eligibility

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

Related Conditions & MeSH terms

• Adaptation Reaction

Intervention

Behavioral:
• presentation of visual and vestibular stimuli
In each participant the investigators will assess verticality perception in whole-body upright position by use of the SVV, the SPV and the SHV after static roll-tilt at ±90deg over 5min. Measurements will be obtained on a motor-driven turntable and two different roll-tilt positions will be applied (±90°). A visual line (SVV), a rod (SHV) or the turntable itself will be adjusted to indicate perceived direction of vertical. A total of three measuring sessions, each lasting about 60 minutes are scheduled.

Locations

Country	Name	City	State
Switzerland	University Hospital Zurich, Dept. of Neurology	Zurich	ZH

Sponsors (1)

Lead Sponsor	Collaborator
University of Zurich

Country where clinical trial is conducted

Switzerland, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	adjustment errors of the subjective visual/haptic/postural vertical in upright position after prolonged whole-body roll-tilt positions.	the accuracy and precision of visual vertical adjustments after prolonged roll tilt are quantified.	10 minutes (i.e. short-term adaptation)
Secondary	changes in adjustment errors of the subjective visual vertical when providing an additional optokinetic stimulus	This is the same as in outcome 1, but an additional visual (optokinetic) stimulus is added	10 minutes (i.e. short-term adaptation)
Secondary	changes in adjustment errors of the subjective haptic vertical when providing an additional optokinetic stimulus	This is the same as in outcome 1, but an additional visual (optokinetic) stimulus is added	10 minutes (i.e. short-term adaptation)
Secondary	changes in adjustment errors of the subjective postural vertical when providing an additional optokinetic stimulus	This is the same as in outcome 1, but an additional visual (optokinetic) stimulus is added	10 minutes (i.e. short-term adaptation)