Age changes in perception of verticality and of the longitudinal body axis under body tilt

1968 ◽  
Vol 6 (4) ◽  
pp. 543-555 ◽  
Author(s):  
Seymour Wapner
Keyword(s):  
Body Axis ◽  
Body Tilt ◽  
Age Changes ◽  
Longitudinal Body Axis ◽  
Perception Of Verticality

Method of Stimulus Presentation and Apparent Body Position under Lateral Body Tilt

1967 ◽  
Vol 24 (1) ◽  
pp. 43-50 ◽  
Author(s):  
M. Bauermeister ◽  
S. Wapner ◽  
H. Werner
Keyword(s):  
Reference System ◽  
Body Position ◽  
Body Schema ◽  
Stimulus Presentation ◽  
Body Axis ◽  
Body Tilt ◽  
Spatial Reference ◽  
Longitudinal Body Axis ◽  
Lateral Body ◽  
Method Of Constant Stimuli

Eighty Ss, 40 male and 40 female, indicated by means of a luminescent rod the location of their longitudinal body axis (apparent body position) under body tilt ranging from 90° left (counterclockwise), through upright, to 90° right (clockwise). The luminescent rod was presented by two psychophysical methods: (a) the method of limits and (b) the method of constant stimuli. Deviations of apparent from objective body position showed significant differences between the two methods. The results were interpreted in terms of an organismic theory of perception, utilizing the notion of a dynamic body schema as spatial reference system which was subject to modifications due to the method of stimulus presentation.

scholarly journals Antihysteresis of perceived longitudinal body axis during continuous quasi-static whole-body rotation in the earth-vertical roll plane

2011 ◽  
Vol 209 (3) ◽  
pp. 443-454
Author(s):  
M. Tatalias ◽  
C. J. Bockisch ◽  
G. Bertolini ◽  
D. Straumann ◽  
A. Palla
Keyword(s):  
Body Axis ◽  
Whole Body ◽  
Body Rotation ◽  
Longitudinal Body Axis ◽  
Vertical Roll ◽  
The Earth

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.

Perception of longitudinal body axis in microgravity during parabolic flight

2007 ◽  
Vol 413 (2) ◽  
pp. 150-153 ◽  
Author(s):  
Gilles Clément ◽  
Tonje N. Arnesen ◽  
Morten H. Olsen ◽  
Bruno Sylvestre
Keyword(s):  
Parabolic Flight ◽  
Body Axis ◽  
Longitudinal Body Axis

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.

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 Gruesome twosome kukri rippers: Oligodon formosanus (Günther, 1872) and O. fasciolatus (Günther, 1864) eat Kaloula pulchra Gray, 1831 either by eviscerating or swallowing whole

Herpetozoa ◽  
2021 ◽  
Vol 34 ◽  
pp. 49-55
Author(s):  
Henrik Bringsøe ◽  
Maneerat Suthanthangjai ◽  
Winai Suthanthangjai ◽  
Jo Lodder ◽  
Navapol Komanasin
Keyword(s):  
Hong Kong ◽  
Prey Size ◽  
Body Axis ◽  
Anuran Species ◽  
Longitudinal Body Axis

Predation on adult microhylid frogs Kaloula pulchra by two closely-related colubrid snakes is described, based on two observations of Oligodon formosanus in Hong Kong and one observation of O. fasciolatus in Thailand. In two instances, O. formosanus was observed cutting open the abdomen of this anuran species. In one case, it performed repeated rotations about its own longitudinal body axis (“death roll”) while its head was inserted into the frog’s abdomen. The purpose of this behaviour was probably to tear off organs and swallow them. Once O. fasciolatus was observed catching and swallowing K. pulchra whole. In that case, the snake also made a series of rotations while it maintained its firm grip in the frog’s belly. It is concluded that, for these two closely-related kukri snakes, prey size is crucial for determining whether the gape width allows large preys to be swallowed entire.

scholarly journals Effects of prismatic adaptation on balance and postural disorders in patients with chronic right stroke: protocol for a multicentre double-blind randomised sham-controlled trial

BMJ Open ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. e052086
Author(s):  
Aurélien Hugues ◽  
Amandine Guinet-Lacoste ◽  
Sylvie Bin ◽  
Laurent Villeneuve ◽  
Marine Lunven ◽  
...  
Keyword(s):  
Controlled Trial ◽  
Weight Bearing ◽  
Body Axis ◽  
Double Blind ◽  
Longitudinal Body Axis ◽  
Stroke Lesion ◽  
The Right ◽  
Prismatic Adaptation ◽  
Straight Ahead ◽  
Postural Disorders

IntroductionPatients with right stroke lesion have postural and balance disorders, including weight-bearing asymmetry, more pronounced than patients with left stroke lesion. Spatial cognition disorders post-stroke, such as misperceptions of subjective straight-ahead and subjective longitudinal body axis, are suspected to be involved in these postural and balance disorders. Prismatic adaptation has showed beneficial effects to reduce visuomotor disorders but also an expansion of effects on cognitive functions, including spatial cognition. Preliminary studies with a low level of evidence have suggested positive effects of prismatic adaptation on weight-bearing asymmetry and balance after stroke. The objective is to investigate the effects of this intervention on balance but also on postural disorders, subjective straight-ahead, longitudinal body axis and autonomy in patients with chronic right stroke lesion.Methods and analysisIn this multicentre randomised double-blind sham-controlled trial, we will include 28 patients aged from 18 to 80 years, with a first right supratentorial stroke lesion at chronic stage (≥12 months) and having a bearing ≥60% of body weight on the right lower limb. Participants will be randomly assigned to the experimental group (performing pointing tasks while wearing glasses shifting optical axis of 10 degrees towards the right side) or to the control group (performing the same procedure while wearing neutral glasses without optical deviation). All participants will receive a 20 min daily session for 2 weeks in addition to conventional rehabilitation. The primary outcome will be the balance measured using the Berg Balance Scale. Secondary outcomes will include weight-bearing asymmetry and parameters of body sway during static posturographic assessments, as well as lateropulsion (measured using the Scale for Contraversive Pushing), subjective straight-ahead, longitudinal body axis and autonomy (measured using the Barthel Index).Ethics and disseminationThe study has been approved by the ethical review board in France. Findings will be submitted to peer-reviewed journals relative to rehabilitation or stroke.Trial registration numberNCT03154138.

scholarly journals Neuroanatomical correlates of the perception of body axis orientation during body tilt: a voxel-based morphometry study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Keisuke Tani ◽  
Satoshi Tanaka
Keyword(s):  
Individual Differences ◽  
Longitudinal Axis ◽  
The Body ◽  
Body Axis ◽  
Body Tilt ◽  
Whole Body ◽  
Voxel Based Morphometry ◽  
Neural Basis ◽  
Axis Orientation ◽  
The Right

AbstractAccurate perception of the orientations of the body axis and gravity is essential for actions. The ability to perceive these orientations during head and body tilt varies across individuals, and its underlying neural basis is unknown. To address this, we investigated the association between inter-individual differences in local gray matter (GM) volume and inter-individual differences in the ability to estimate the directions of body longitudinal axis or gravity during whole-body tilt using voxel-based morphometry (VBM) analysis in 50 healthy adults (20–46 years, 25 men and 25 women). Although no anatomical regions were identified relating to performance requiring estimates of gravitational direction, we found a significant correlation between the GM volume in the right middle occipital gyrus and the ability to estimate the body axis orientation. This finding provides the first evidence on neuroanatomical substrates of the perception of body axis orientation during body tilt.

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