The Effect of Body Tilt on Tactual-Kinesthetic Perception of Verticality

1964 ◽  
Vol 77 (3) ◽  
pp. 451 ◽  
Author(s):  
Martin Bauermeister ◽  
Heinz Werner ◽  
Seymour Wapner
Keyword(s):  
Body Tilt ◽  
Perception Of Verticality ◽  
Kinesthetic Perception

scholarly journals Altered Visual and Proprioceptive Spatial Perception in Individuals with Parkinson’s Disease

2019 ◽  
Vol 127 (1) ◽  
pp. 98-112
Author(s):  
Gustavo José Luvizutto ◽  
Thanielle Souza Silva Brito ◽  
Eduardo de Moura Neto ◽  
Luciane Aparecida Pascucci Sande de Souza
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Clinical Relevance ◽  
Spatial Perception ◽  
Research Literature ◽  
Body Tilt ◽  
Healthy Controls ◽  
Cross Sectional ◽  
Somatosensory Information ◽  
Perception Of Verticality

Difficulties in the integration of visual, vestibular, and somatosensory information in individuals with Parkinson’s disease (PD) may alter perception of verticality. Accordingly, in this cross-sectional study, we analyzed PD patients’ ( n = 13) subjective visual vertical (SVV) and subjective haptic vertical (SHV) perceptions and compared them to those of healthy controls ( n = 14). We compared SVV and SHV findings among participants with PD, healthy controls, and cutoff points of normality based on prior research literature, using the parametric nonpaired t test (at p < .05) and Cohen’s d (at d > 0.8) to determine clinical relevance. We analyzed SVV with the bucket test and SHV with the rod rotations task in clockwise and counterclockwise directions. We calculated Pearson correlations to analyze the association between verticality tests and the most clinically affected body side. We calculated both the percentage of A-effect (expression of body tilt underestimation to the midline) and E-effect (expression of body tilt overestimation in the upright position). Individuals with PD showed greater variability in right SHV supination compared to the healthy control participants ( p = .002). There was greater clinical relevance in right (as opposed to left) SVV ( d = 0.83), right (as opposed to left) SHV pronation ( d = 0.91), and left (as opposed to right) SHV pronation ( d = 0.88). We observed a higher proportion of E-effect in individuals with PD. A significantly higher proportion of patients with PD, compared to patients in past literature, had right SHV pronation ( p = .001), left SHV pronation ( p = .023), right SHV supination ( p = .001), left SHV supination ( p = .046), and left SHV pronation ( p = .046). Thus, subjective visual and proprioceptive perception of verticality is altered in patients with PD, compared to individuals without PD.

scholarly journals Multisensory Interactions in Head and Body Centered Perception of Verticality

2021 ◽  
Vol 14 ◽  
Author(s):  
Ksander N. De Winkel ◽  
Ellen Edel ◽  
Riender Happee ◽  
Heinrich H. Bülthoff
Keyword(s):  
Force Plate ◽  
Head Tilt ◽  
Weighted Average ◽  
The Body ◽  
Body Tilt ◽  
Motion Platform ◽  
Postural Responses ◽  
Body Sensors ◽  
Multisensory Interactions ◽  
Perception Of Verticality

Percepts of verticality are thought to be constructed as a weighted average of multisensory inputs, but the observed weights differ considerably between studies. In the present study, we evaluate whether this can be explained by differences in how visual, somatosensory and proprioceptive cues contribute to representations of the Head In Space (HIS) and Body In Space (BIS). Participants (10) were standing on a force plate on top of a motion platform while wearing a visualization device that allowed us to artificially tilt their visual surroundings. They were presented with (in)congruent combinations of visual, platform, and head tilt, and performed Rod &amp; Frame Test (RFT) and Subjective Postural Vertical (SPV) tasks. We also recorded postural responses to evaluate the relation between perception and balance. The perception data shows that body tilt, head tilt, and visual tilt affect the HIS and BIS in both experimental tasks. For the RFT task, visual tilt induced considerable biases (≈ 10° for 36° visual tilt) in the direction of the vertical expressed in the visual scene; for the SPV task, participants also adjusted platform tilt to correct for illusory body tilt induced by the visual stimuli, but effects were much smaller (≈ 0.25°). Likewise, postural data from the SPV task indicate participants slightly shifted their weight to counteract visual tilt (0.3° for 36° visual tilt). The data reveal a striking dissociation of visual effects between the two tasks. We find that the data can be explained well using a model where percepts of the HIS and BIS are constructed from direct signals from head and body sensors, respectively, and indirect signals based on body and head signals but corrected for perceived neck tilt. These findings show that perception of the HIS and BIS derive from the same sensory signals, but see profoundly different weighting factors. We conclude that observations of different weightings between studies likely result from querying of distinct latent constructs referenced to the body or head in space.

Doll Reflex as a Function of Body Tilt in the Median Plane

1973 ◽  
Author(s):  
Wayne Shebilske ◽  
Sheldon M. Ebenholtz
Keyword(s):  
Median Plane ◽  
Body Tilt

Unilateral Auditory Stimulation and the Visual Perception of Verticality: One More Time

1980 ◽  
Vol 50 (1) ◽  
pp. 171-182
Author(s):  
H. D. Day ◽  
L. F. Shelly
Keyword(s):  
Field Theory ◽  
Visual Perception ◽  
Auditory Stimulation ◽  
Vertical Position ◽  
Starting Position ◽  
Perception Of Verticality

The effects of varying conditions of unilateral auditory stimulation on the visual perception of verticality were examined in two experiments using 18 and 42 subjects, respectively. Significant effects of auditory stimulation and hand used to make the verticality adjustments were not found. With only one exception in Exp. 2, the starting position of the rod also had no influence on the ability of the subjects to adjust a rod to its vertical position. The literature pertaining to sensory-tonic field theory of perception was critically reviewed.

Microvascular skin response to local cooling and body tilt early after digital replantation

2000 ◽  
Vol 25 (3) ◽  
pp. 552-558 ◽  
Author(s):  
Ksenija Cankar ◽  
Zoran M. Arnez̆ ◽  
žare Finderle ◽  
Martin Štrucl
Keyword(s):  
Body Tilt ◽  
Local Cooling ◽  
Skin Response ◽  
Digital Replantation
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