scholarly journals Multisensory contribution in visuospatial orientation: an interaction between neck and trunk proprioception

2021 ◽  
Author(s):  
Jason McCarthy ◽  
Patricia Castro ◽  
Rachael Cottier ◽  
Joseph Buttell ◽  
Qadeer Arshad ◽  
...  
Keyword(s):  
Spatial Orientation ◽  
Visual Information ◽  
Visual Cues ◽  
Body Position ◽  
The Body ◽  
Visual Inputs ◽  
Visual Vertical ◽  
The Right ◽  
Trunk Position ◽  
The Brain

AbstractA coherent perception of spatial orientation is key in maintaining postural control. To achieve this the brain must access sensory inputs encoding both the body and the head position and integrate them with incoming visual information. Here we isolated the contribution of proprioception to verticality perception and further investigated whether changing the body position without moving the head can modulate visual dependence—the extent to which an individual relies on visual cues for spatial orientation. Spatial orientation was measured in ten healthy individuals [6 female; 25–47 years (SD 7.8 years)] using a virtual reality based subjective visual vertical (SVV) task. Individuals aligned an arrow to their perceived gravitational vertical, initially against a static black background (10 trials), and then in other conditions with clockwise and counterclockwise background rotations (each 10 trials). In all conditions, subjects were seated first in the upright position, then with trunk tilted 20° to the right, followed by 20° to the left while the head was always aligned vertically. The SVV error was modulated by the trunk position, and it was greater when the trunk was tilted to the left compared to right or upright trunk positions (p < 0.001). Likewise, background rotation had an effect on SVV errors as these were greater with counterclockwise visual rotation compared to static background and clockwise roll motion (p < 0.001). Our results show that the interaction between neck and trunk proprioception can modulate how visual inputs affect spatial orientation.

scholarly journals Perception of the dynamic visual vertical during sinusoidal linear motion

2017 ◽  
Vol 118 (4) ◽  
pp. 2499-2506 ◽  
Author(s):  
A. Pomante ◽  
L. P. J. Selen ◽  
W. P. Medendorp
Keyword(s):  
Vestibular System ◽  
Spatial Orientation ◽  
Linear Acceleration ◽  
The Body ◽  
Body Motion ◽  
Whole Body ◽  
Linear Motion ◽  
Modeling Framework ◽  
Visual Vertical ◽  
The Brain

The vestibular system provides information for spatial orientation. However, this information is ambiguous: because the otoliths sense the gravitoinertial force, they cannot distinguish gravitational and inertial components. As a consequence, prolonged linear acceleration of the head can be interpreted as tilt, referred to as the somatogravic effect. Previous modeling work suggests that the brain disambiguates the otolith signal according to the rules of Bayesian inference, combining noisy canal cues with the a priori assumption that prolonged linear accelerations are unlikely. Within this modeling framework the noise of the vestibular signals affects the dynamic characteristics of the tilt percept during linear whole-body motion. To test this prediction, we devised a novel paradigm to psychometrically characterize the dynamic visual vertical—as a proxy for the tilt percept—during passive sinusoidal linear motion along the interaural axis (0.33 Hz motion frequency, 1.75 m/s2peak acceleration, 80 cm displacement). While subjects ( n=10) kept fixation on a central body-fixed light, a line was briefly flashed (5 ms) at different phases of the motion, the orientation of which had to be judged relative to gravity. Consistent with the model’s prediction, subjects showed a phase-dependent modulation of the dynamic visual vertical, with a subject-specific phase shift with respect to the imposed acceleration signal. The magnitude of this modulation was smaller than predicted, suggesting a contribution of nonvestibular signals to the dynamic visual vertical. Despite their dampening effect, our findings may point to a link between the noise components in the vestibular system and the characteristics of dynamic visual vertical.NEW & NOTEWORTHY A fundamental question in neuroscience is how the brain processes vestibular signals to infer the orientation of the body and objects in space. We show that, under sinusoidal linear motion, systematic error patterns appear in the disambiguation of linear acceleration and spatial orientation. We discuss the dynamics of these illusory percepts in terms of a dynamic Bayesian model that combines uncertainty in the vestibular signals with priors based on the natural statistics of head motion.

*Grown MD CBD gummies Where To buy? Scam Pills | Alert* v1

2022 ◽  
Author(s):  
health not provided
Keyword(s):  
Circulatory System ◽  
Grape Seed ◽  
The Body ◽  
Secondary Effects ◽  
Psychological Issues ◽  
Primary Element ◽  
Grape Seed Oil ◽  
The Right ◽  
Sleeping Disorder ◽  
The Brain

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scholarly journals Interactional Imogen: language, practice and the body

2020 ◽  
Vol 19 (5) ◽  
pp. 933-960
Author(s):  
Harry Collins
Keyword(s):  
Artificial Intelligence ◽  
The Body ◽  
Human Group ◽  
Language Practice ◽  
Political Consequences ◽  
The Right ◽  
The Brain

Abstract Here I try to improve on the available answers to certain long-debated questions and set out some consequences for the answers. Are there limits to the extent to which we can understand the conceptual worlds of other human communities and of non-human creatures? How does this question relate to our ability to engage in other cultures’ practices and languages? What is meant by ‘the body’ and what is meant by ‘the brain’ and how do different meanings bear on the questions? The central answer developed here is that it is possible, given the right circumstances, for a competent human from any human group to understand the culture of any other human group without engaging in their practices though there are barriers when it comes to communication across species. This answer has important social and political consequences and consequences for the debate about artificial intelligence.

Modulation of Spatial Orientation Processing by Mental Imagery Instructions: A MEG Study of Representational Momentum

2000 ◽  
Vol 12 (4) ◽  
pp. 569-582 ◽  
Author(s):  
Michel-Ange Amorim ◽  
Wilfried Lang ◽  
Gerald Lindinger ◽  
Dagmar Mayer ◽  
Lüder Deecke ◽  
...  
Keyword(s):  
Mental Imagery ◽  
Spatial Orientation ◽  
Visual Motion ◽  
Brain Activity ◽  
Representational Momentum ◽  
The Body ◽  
Body Motion ◽  
Body Tilt ◽  
Rotational Equilibrium ◽  
The Right

Under appropriate conditions, an observer's memory for the final position of an abruptly halted moving object is distorted in the direction of the represented motion. This phenomenon is called “representational momentum” (RM). We examined the effect of mental imagery instructions on the modulation of spatial orientation processing by testing for RM under conditions of picture versus body rotation perception and imagination. Behavioral data were gathered via classical reaction time and error measurements, whereas brain activity was recorded with the help of magnetoence-phalography (MEG). Due to the so-called inverse problem and to signal complexity, results were described at the signal level rather than with the source location modeling. Brain magnetic field strength and spatial distribution, as well as latency of P200m evoked fields were used as neurocognitive markers. A task was devised where a subject examined a rotating sea horizon as seen from a virtual boat in order to extrapolate either the picture motion or the body motion relative to the picture while the latter disappeared temporarily until a test-view was displayed as a final orientation candidate. Results suggest that perceptual interpretation and extrapolation of visual motion in the roll plane capitalize on the fronto-parietal cortical networks involving working memory processes. Extrapolation of the rotational dynamics of sea horizon revealed a RM effect simulating the role of gravity in rotational equilibrium. Modulation of the P200m component reflected spatial orientation processing and a non-voluntary detection of an incongruity between displayed and expected final orientations given the implied motion. Neuromagnetic properties of anticipatory (Contingent Magnetic Variation) and evoked (P200m) brain magnetic fields suggest, respectively, differential allocation of attentional resources by mental imagery instructions (picture vs. body tilt), and a communality of neural structures (in the right centro-parietal region) for the control of both RM and mental rotation processes. Finally, the RM of the body motion is less prone to forward shifts than that of picture motion evidencing an internalization of the implied mass of the virtual body of the observer.

Evidence for a dorso-medial parietal system involved in mental transformations of the body

1996 ◽  
Vol 76 (3) ◽  
pp. 2042-2048 ◽  
Author(s):  
E. Bonda ◽  
S. Frey ◽  
M. Petrides
Keyword(s):  
Blood Flow ◽  
Parietal Cortex ◽  
Human Subjects ◽  
Body Position ◽  
The Body ◽  
Right Hand ◽  
Positron Emission ◽  
Superior Parietal Cortex ◽  
The Right ◽  
Mental Transformations

1. The neural systems underlying body-space mental representation were studied by measuring changes in regional cerebral blood flow (CBF) with positron emission tomography in human subjects. 2. The experimental paradigm involved identification of the left or the right hand of the experimenter presented in different orientations or the palm of the subject's right hand. The subjects were required to decide whether it was the left or the right hand that was presented. To perform this task, the subjects had to move mentally the position of their own arm to adopt that of the experimenter's arm. The control condition involved the same type of tactual stimulation without the requirement of mental transformations of the subject's body position. The distribution of CBF was measured by means of the water bolus H2(15)O methodology during the performance of these tasks. 3. Comparison of the distribution of CBF between the experimental and control tasks was carried out to reveal changes specific to the mental transformations of the subject's body. Significant blood flow increases were observed in the caudal superior parietal cortex, including the intraparietal sulcus, and the adjacent medial parietal cortex. These findings demonstrated that there is a dorsomedially directed parietal system underlying mental transformations of the body in interactive relation with external space.

Convexity Meningioma Presenting as Postpartum Eclampsia

2003 ◽  
Vol 33 (1) ◽  
pp. 53-54 ◽  
Author(s):  
Bello B Shehu ◽  
Nasiru J Ismail
Keyword(s):  
Early Diagnosis ◽  
The Body ◽  
History Of ◽  
Neurological Features ◽  
The Right ◽  
The Brain ◽  
Tomography Scan ◽  
Progressive Weakness ◽  
In Pregnancy

A 37-year-old woman, Para 5+0 presented with a 1 year history of recurrent convulsions and progressive weakness of the right side of the body. She had been treated for postpartum eclampsia in her last delivery but symptoms recurred 3 months later. Evaluation including computerized tomography scan of the brain suggested a parieto-temporal meningioma, which was completely excised at craniotomy. Histology confirmed this to be a meningioma. The patient was well at 8 months of follow up. The growth of meningiomas may increase during pregnancy due to presence of receptors for progestational hormones in the tumour and the meningioma may become symptomatic in pregnancy, presenting as eclampsia. Close follow up of patients with eclampsia is necessary to identify neurological features that may lead to a diagnosis of meningioma. Early diagnosis is essential if a good outcome is to be ensured.

scholarly journals Smell what you hardly see: Odors assist categorization in the human visual cortex

2021 ◽  
Author(s):  
Diane Rekow ◽  
Jean-Yves Baudouin ◽  
Karine Durand ◽  
Arnaud Leleu
Keyword(s):  
Visual Information ◽  
Right Hemisphere ◽  
Visual Stimulation ◽  
Temporal Cortex ◽  
Visual Response ◽  
Visual Categorization ◽  
Visual Inputs ◽  
Scalp Electroencephalogram ◽  
Human Faces ◽  
The Brain

Visual categorization is the brain ability to rapidly and automatically respond to widely variable visual inputs in a category-selective manner (i.e., distinct responses between categories and similar responses within categories). Whether category-selective neural responses are purely visual or can be influenced by other sensory modalities remains unclear. Here, we test whether odors modulate visual categorization, expecting that odors facilitate the neural categorization of congruent visual objects, especially when the visual category is ambiguous. Scalp electroencephalogram (EEG) was recorded while natural images depicting various objects were displayed in rapid 12-Hz streams (i.e., 12 images / second) and variable exemplars of a target category (either human faces, cars, or facelike objects in dedicated sequences) were interleaved every 9th stimulus to tag category-selective responses at 12/9 = 1.33 Hz in the EEG frequency spectrum. During visual stimulation, participants (N = 26) were implicitly exposed to odor contexts (either body, gasoline or baseline odors) and performed an orthogonal cross-detection task. We identify clear category-selective responses to every category over the occipito-temporal cortex, with the largest response for human faces and the lowest for facelike objects. Critically, body odor boosts the response to the ambiguous facelike objects (i.e., either perceived as nonface objects or faces) over the right hemisphere, especially for participants reporting their presence post-stimulation. By contrast, odors do not significantly modulate other category-selective responses, nor the general visual response recorded at 12 Hz, revealing a specific influence on the categorization of congruent ambiguous stimuli. Overall, these findings support the view that the brain actively uses cues from the different senses to readily categorize visual inputs, and that olfaction, which is generally considered as poorly functional in humans, is well placed to disambiguate visual information.

scholarly journals HEALTH MEET - MUSIC

2015 ◽  
Vol 3 (1SE) ◽  
pp. 1-2
Author(s):  
Monisha Veeravani
Keyword(s):  
Music Therapy ◽  
Human Life ◽  
High Stress ◽  
The Body ◽  
Special Importance ◽  
Entire Body ◽  
Sound Waves ◽  
The Right ◽  
The Mind ◽  
The Brain

Music gives people a deeper understanding on the level of sensation and motivates them to become better and this element can change the world when it is wider than our own. It is music that connects the beginning to the end and becomes the literature of our heart. Fills the soul with affection, takes the mind from deep darkness to eternal heights. Music has the status of a® God, so purity has special importance in this genre. Music is the way to cultivate the mind through the seven pure and five vocal cords. Therefore, it can be said that music is necessary to keep the body and mind healthy, cheerful. This keeps the body, mind and brain healthy, and concentrates. Stress is also removed from music. It has been proved by various scientific experiments that both music practice and yoga practice develop strength in human life and many diseases can be treated. Music therapy i.e. music therapy nowadays plays an important role in relieving many health problems. Is playing If you live under high stress or are suffering from insomnia problem, then you can take help of this therapy. Each sound produces specific waves. These sound waves directly affect our brain. Everything in existence is affected by these waves. If a music is composed with the right words and the appropriate ragas, it will work on our brain in the same way that the software works inside a computer. Since our entire body is under the control of the brain, we can get the right result by having the expected effect on the brain through remedial music. संगीत लोगों को संवेदना के स्तर पर एक गहरी समझ देकर उन्हें बेहतर बनने की दिशा में प्रेरित करता है और यही तत्व जब निज से व्यापक होता है तो दुनिया भी बदल सकती है. ये संगीत ही है जो आदि को अंत से जोडकर हमारे हृदय का साहित्य बन जाता है। आत्मा को स्नेह से भर देता है मन को गहन अन्धकार से लेकर अनन्त ऊंचाइयों तक ले जाता है । संगीत क® ईश्वर का दर्जा प्राप्त है, इसीलिए इस विधा में शुध्दता का विशेष महत्व है। सात षुघ्द अ©र पांच क®मल स्वर®ं के माध्यम से मन क® साधने का उपाय है संगीत। अतः कहा जा सकता है कि शरीर तथा मन क® स्वस्थ््ा, प्रफुल्लित रखने के लिए संगीत आवश््यक है। इससे शरीर, मन, मस्तिष्क स्वस्थ््ा रहता है, एकाग्र रहता है। संगीत से तनाव भी दूर ह®ता है। विभिन्न वैज्ञानिक प्रयोगों द्वारा यह सिद्ध हो चुका है कि संगीत साधना व योग साधना दोनों से मनुष्य के जीवन में शक्ति का विकास होता है और अनेक बीमारियों का उपचार किया जा सकता है म्यूजिक थेरेपी यानी संगीत चिकित्सा आजकल अनेक स्वास्थ्य समस्याओं से राहत दिलाने में अहम भूमिका निभा रही है। आप अगर ज्यादा तनाव में रहते हैं या अनिद्रा की समस्या से पीडित हैं तो इस चिकित्सा की सहायता ले सकते हैं । हर ध्वनि से विशिष्ट तरंगें पैदा होती हैं। ये ध्वनि तरंगें सीधे हमारे मस्तिष्क को प्रभावित करती हैं। इन्हीं तरंगों से अस्तित्व में मौजूद हर चीज प्रभावित होती है। अगर कोई संगीत सही शब्दों और उपयुक्त रागों के साथ तैयार किया जाए तो वह हमारे मस्तिष्क पर उसी तरह काम करेगा जैसे किसी ’कम्प्यूटर’ के अंदर ’साफ्टवेयर’ काम करता है। चूंकि हमारा पूरा शरीर मस्तिष्क के नियंत्रण में होता है, इसलिए हम मस्तिष्क पर उपचारी संगीत के माध्यम से अपेक्षित प्रभाव डालकर सही परिणाम प्राप्त कर सकते हैं।

scholarly journals Visual influences on auditory spatial learning

2008 ◽  
Vol 364 (1515) ◽  
pp. 331-339 ◽  
Author(s):  
Andrew J King
Keyword(s):  
Visual Information ◽  
Critical Role ◽  
Spatial Cues ◽  
Auditory Space ◽  
Auditory Responses ◽  
Neural Representations ◽  
Visual Inputs ◽  
Mature Brain ◽  
Auditory Systems ◽  
The Brain

The visual and auditory systems frequently work together to facilitate the identification and localization of objects and events in the external world. Experience plays a critical role in establishing and maintaining congruent visual–auditory associations, so that the different sensory cues associated with targets that can be both seen and heard are synthesized appropriately. For stimulus location, visual information is normally more accurate and reliable and provides a reference for calibrating the perception of auditory space. During development, vision plays a key role in aligning neural representations of space in the brain, as revealed by the dramatic changes produced in auditory responses when visual inputs are altered, and is used throughout life to resolve short-term spatial conflicts between these modalities. However, accurate, and even supra-normal, auditory localization abilities can be achieved in the absence of vision, and the capacity of the mature brain to relearn to localize sound in the presence of substantially altered auditory spatial cues does not require visuomotor feedback. Thus, while vision is normally used to coordinate information across the senses, the neural circuits responsible for spatial hearing can be recalibrated in a vision-independent fashion. Nevertheless, early multisensory experience appears to be crucial for the emergence of an ability to match signals from different sensory modalities and therefore for the outcome of audiovisual-based rehabilitation of deaf patients in whom hearing has been restored by cochlear implantation.

scholarly journals Out-of-body experiences–100 words

2015 ◽  
Vol 206 (3) ◽  
pp. 222-222
Author(s):  
Peter Fenwick
Keyword(s):  
Cardiac Arrest ◽  
Visual Information ◽  
Personal Space ◽  
Body Experiences ◽  
The World ◽  
Death State ◽  
The Right ◽  
The Brain

Out-of-body experiences, in which the person feels they are viewing the world from outside their body, may be spontaneous or triggered by pain or fear, due to failure to integrate proprioceptive, tactile and visual information in the right parieto-temporal junction. They are similar to autoscopy, namely seeing your body in extra-personal space. But out-of-body experiences can occur in a near-death state during a cardiac arrest and be remembered even though brain processes are distorted or absent. Reliable accounts of patients who have acquired verifiable information while clinically dead suggest that consciousness may not after all be limited to the brain.

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