scholarly journals Intrinsic somatosensory feedback supports motor control and learning to operate artificial body parts

2022 ◽  
Author(s):  
Elena Amoruso ◽  
Lucy Dowdall ◽  
Mathew Thomas Kollamkulam ◽  
Obioha Ukaegbu ◽  
Paulina Kieliba ◽  
...  
Keyword(s):  
Motor Control ◽  
Motor System ◽  
Pressure Sensors ◽  
Body Part ◽  
Skill Learning ◽  
The Body ◽  
Control Group ◽  
Body Parts ◽  
Somatosensory Feedback ◽  
Somatosensory Information

Abstract Objective Considerable resources are being invested to enhance the control and usability of artificial limbs through the delivery of unnatural forms of somatosensory feedback. Here, we investigated whether intrinsic somatosensory information from the body part(s) remotely controlling an artificial limb can be leveraged by the motor system to support control and skill learning. Approach In a placebo-controlled design, we used local anaesthetic to attenuate somatosensory inputs to the big toes while participants learned to operate through pressure sensors a toe-controlled and hand-worn robotic extra finger. Motor learning outcomes were compared against a control group who received sham anaesthetic and quantified in three different task scenarios: while operating in isolation from, in synchronous coordination, and collaboration with, the biological fingers. Main results Both groups were able to learn to operate the robotic extra finger, presumably due to abundance of visual feedback and other relevant sensory cues. Importantly, the availability of displaced somatosensory cues from the distal bodily controllers facilitated the acquisition of isolated robotic finger movements, the retention and transfer of synchronous hand-robot coordination skills, and performance under cognitive load. Motor performance was not impaired by toes anaesthesia when tasks involved close collaboration with the biological fingers, indicating that the motor system can close the sensory feedback gap by dynamically integrating task-intrinsic somatosensory signals from multiple, and even distal, body- parts. Significance Together, our findings demonstrate that there are multiple natural avenues to provide intrinsic surrogate somatosensory information to support motor control of an artificial body part, beyond artificial stimulation.

scholarly journals Somatosensory signals from the controllers of an extra robotic finger support motor learning

2021 ◽  
Author(s):  
Elena Amoruso ◽  
Lucy Dowdall ◽  
Mathew Thomas Kollamkulam ◽  
Obioha Ukaegbu ◽  
Paulina Kieliba ◽  
...  
Keyword(s):  
Motor Control ◽  
Motor Learning ◽  
Pressure Sensors ◽  
Motor Task ◽  
Body Part ◽  
Control Group ◽  
Body Parts ◽  
Position Information ◽  
Somatosensory Information ◽  
Alternative Means

Considerable resources are being invested to provide bidirectional control of substitutive and augmentative motor interfaces through artificial somatosensory feedback. Here, we investigated whether intrinsic somatosensory information, from body part(s) proportionally controlling an augmentation device, can be utilised to infer the device state and position, to better support motor control and learning. In a placebo-controlled design, we used local anaesthetic to attenuate somatosensory inputs to the big toes while participants learned to operate a toe-controlled robotic extra finger (Third Thumb) using pressure sensors. Motor learning outcomes were compared against a control group who received sham anaesthetic. The availability of somatosensory cues about the amount of exerted pressure generally facilitated acquisition, retention and transfer of motor skills, and performance under cognitive load. Motor performance was not impaired by anaesthesia when tasks involved close collaboration with the biological fingers, indicating that the brain could close the gap of the missing pressure signals by alternative means, including feedback from other body parts involved in the motor task. Together, our findings demonstrate that there are intrinsic natural avenues to provide surrogate position information to support motor control of an artificial body part, beyond artificial extrinsic signalling.

scholarly journals Visual and somatosensory information contribute to distortions of the body model

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Valeria Peviani ◽  
Lucia Melloni ◽  
Gabriella Bottini
Keyword(s):  
Estimation Error ◽  
Body Part ◽  
Spatial Dimension ◽  
Line Length ◽  
Judgment Task ◽  
The Body ◽  
Body Parts ◽  
Tactile Acuity ◽  
Body Model ◽  
Somatosensory Information

Abstract Distorted representations of the body are observed in healthy individuals as well as in neurological and psychiatric disorders. Distortions of the body model have been attributed to the somatotopic cerebral representation. Recently, it has been demonstrated that visual biases also contribute to those distortions. To better understand the sources of such distortions, we compared the metric representations across five body parts affording different degrees of tactile sensitivity and visual accessibility. We evaluated their perceived dimensions using a Line Length Judgment task. We found that most body parts were underestimated in their dimensions. The estimation error relative to their length was predicted by their tactile acuity, supporting the influence of the cortical somatotopy on the body model. However, tactile acuity did not explain the distortions observed for the width. Visual accessibility in turn does appear to mediate body distortions, as we observed that the dimensions of the dorsal portion of the neck were the only ones accurately perceived. Coherent with the multisensory nature of body representations, we argue that the perceived dimensions of body parts are estimated by integrating visual and somatosensory information, each weighted differently, based on their availability for a given body part and a given spatial dimension.

Corticostriatal transformations in the primate somatosensory system. Projections from physiologically mapped body-part representations

1991 ◽  
Vol 66 (4) ◽  
pp. 1249-1263 ◽  
Author(s):  
A. W. Flaherty ◽  
A. M. Graybiel
Keyword(s):  
Basal Ganglia ◽  
Receptive Fields ◽  
Somatosensory System ◽  
Body Part ◽  
The Body ◽  
Saimiri Sciureus ◽  
Body Parts ◽  
Cortical Areas ◽  
Somatosensory Information ◽  
Multiple Regions

1. The basal ganglia of primates receive somatosensory input carried largely by corticostriatal fibers. To determine whether map-transformations occur in this corticostriatal system, we investigated how electrophysiologically defined regions of the primary somatosensory cortex (SI) project to the striatum in the squirrel monkey (Saimiri sciureus). Receptive fields in the hand, mouth, and foot representations of cortical areas 3a, 3b, and 1 were mapped by multiunit recording; and small volumes of distinguishable anterograde tracers were injected into different body-part representations in single SI areas. 2. Analysis of labeled projections established that at least four types of systematic remapping occur in the primate corticostriatal system. 1) An area of cortex representing a single body part sends fibers that diverge to innervate multiple regions in the putamen, forming branching, patchy fields that are densest in the lateral putamen. The fields do not form elongated cylindrical forms; rather, they are nearly as extended mediolaterally as they are rostrocaudally. 2) Cortical regions representing hand, mouth, and foot send globally somatotopic, nonoverlapping projections to the putamen, but regions with closely related representations (such as those of the thumb and 5th finger in area 3b) send convergent, overlapping corticostriatal projections. The overlap is fairly precise in the caudal putamen, but in the rostral putamen the densest zones of the projections do not overlap. 3) Regions representing homologous body parts in different SI cortical areas send projections that converge in the putamen. This was true of paired projections from areas 3a and 3b, and from areas 3b and 1. Thus corticostriatal inputs representing distinct somatosensory submodalities can project to the same local regions within the striatum. Convergence is not always complete, however: in the rostral putamen of two cases comparing projections from areas 3a and 1, the densest zones of the projections did not overlap. 4) All projections from SI avoid striosomes and innervate discrete zones within the matrix. 3. These experiments demonstrate that the somatosensory representations of the body are reorganized as they are projected from SI to the somatosensory sector of the primate putamen. This remapping suggests that the striatal representation of the body may be functionally distinct from that of each area of SI. The patchy projections may provide a basis for redistribution of somatosensory information to discrete output systems in the basal ganglia. Transformations in the corticostriatal system could thus be designed for modulating different movement-related programs.

Mechanisms and consequences of head injuries in soccer: a study of 451 patients

2011 ◽  
Vol 31 (5) ◽  
pp. E1 ◽  
Author(s):  
Malgorzata A. Kolodziej ◽  
Stephan Koblitz ◽  
Christopher Nimsky ◽  
Dieter Hellwig
Keyword(s):  
Head Injury ◽  
Head Injuries ◽  
Body Part ◽  
Physical Symptoms ◽  
The Body ◽  
Control Group ◽  
Case Group ◽  
Body Parts ◽  
Injury Group ◽  
Complicated Course

Object The goal of this study was to evaluate the incidence and mechanisms of head injury during soccer games and to describe the results after spontaneous resolution of symptoms or after treatment. Methods In a retrospective study from 2005, records on 451 players from the German Soccer Association who had suffered various injuries were collected. The study used a questionnaire in which the player described the accident and the playing situation as well as the clinical course after trauma. This questionnaire also included information about the physical symptoms of the players and the length of their rehabilitation. Two groups were formed: one with head injuries (case group), and the other with injuries of other body parts (control group). Results Of the injuries reported, 108 (23.9%) were related to the head, 114 (25.3%) to the knee, 58 (13%) to the ankle, 56 (12%) to the calf, and 30 (7%) to the shoulder. The areas of the head most frequently involved were the facial and occipital regions. In the head injury group, the head duel was the most common playing action to lead to trauma. In those cases, the body part that hit the injured player was the elbow, arm, or head of the opponent. The most common playing situation was combat in the penalty area. The median hospitalization time after the trauma was 2 days for the case group and 5 days for the control group. The rehabilitation time for the case group was also shorter (median 6.5 days) than for the control group (median 30 days). Conclusions Trivial head injuries in soccer can have a long and complicated course. Nevertheless, the temporary disability is shorter in most cases than for players with injuries to other parts of the body. Modifying the rules of play would be necessary to reduce the incidence of head trauma.

Maximizing Recall of Gruesome Images for Health Effects Advertising: An Experimental Investigation

2010 ◽  
Vol 16 (4) ◽  
pp. 112-121 ◽  
Author(s):  
Brennen W. Mills ◽  
Owen B. J. Carter ◽  
Robert J. Donovan
Keyword(s):  
Experimental Investigation ◽  
Body Part ◽  
The Body ◽  
Advertising Effectiveness ◽  
Body Parts ◽  
Online Study ◽  
Video Clips ◽  
Video Images ◽  
The Impact

The objective of this case study was to experimentally manipulate the impact on arousal and recall of two characteristics frequently occurring in gruesome depictions of body parts in smoking cessation advertisements: the presence or absence of an external physical insult to the body part depicted; whether or not the image contains a clear figure/ground demarcation. Three hundred participants (46% male, 54% female; mean age 27.3 years, SD = 11.4) participated in a two-stage online study wherein they viewed and responded to a series of gruesome 4-s video images. Seventy-two video clips were created to provide a sample of images across the two conditions: physical insult versus no insult and clear figure/ground demarcation versus merged or no clear figure/ground demarcation. In stage one, participants viewed a randomly ordered series of 36 video clips and rated how “confronting” they considered each to be. Seven days later (stage two), to test recall of each video image, participants viewed all 72 clips and were asked to identify those they had seen previously. Images containing a physical insult were consistently rated more confronting and were remembered more accurately than images with no physical insult. Images with a clear figure/ground demarcation were rated as no more confronting but were consistently recalled with greater accuracy than those with unclear figure/ground demarcation. Makers of gruesome health warning television advertisements should incorporate some form of physical insult and use a clear figure/ground demarcation to maximize image recall and subsequent potential advertising effectiveness.

scholarly journals Movement Patterns in Students Diagnosed with ADHD, Objective Measurement in a Natural Learning Environment

2021 ◽  
Vol 18 (8) ◽  
pp. 3870
Author(s):  
Mireia Sempere-Tortosa ◽  
Francisco Fernández-Carrasco ◽  
Ignasi Navarro-Soria ◽  
Carlos Rizo-Maestre
Keyword(s):  
Rating Scale ◽  
The Body ◽  
Social Adaptation ◽  
Assessment Tools ◽  
Control Group ◽  
Childhood And Adolescence ◽  
Clinical Group ◽  
Body Parts ◽  
Psychological Processes ◽  
Strengths And Difficulties

Attention deficit hyperactivity disorder is the most common neuropsychological disorder in childhood and adolescence, affecting the basic psychological processes involved in learning, social adaptation and affective adjustment. From previous research, the disorder is linked to problems in different areas of development, with deficiencies in psychological processes leading to the development of the most common characteristics of the disorder such as inattention, excess of activity and lack of inhibitory control. As for the diagnosis, in spite of being a very frequent disorder, there are multiple controversies about which tools are the most suitable for evaluation. One of the most widespread tools in the professional field is behavior inventories such as the Strengths and Difficulties Questionnaires for Parents and Teachers or the ADHD Rating Scale-V. The main disadvantage of these assessment tools is that they do not provide an objective observation. For this reason, there are different studies focused on recording objective measures of the subjects’ movement, since hyperkinesia is one of the most characteristic symptoms of this disorder. In this sense, we have developed an application that, using a Kinect device, is capable of measuring the movement of the different parts of the body of up to six subjects in the classroom, being a natural context for the student. The main objective of this work is twofold, on the one hand, to investigate whether there are correlations between excessive movement and high scores in the inventories for the diagnosis of ADHD, Rating Scale-V and Strengths and Difficulties Questionnaire (SDQ) and, on the other hand, to determine which sections of the body present the most significant mobility in subjects diagnosed with ADHD. Results show that the control group, composed of neurotypical subjects, presents less kinaesthetic activity than the clinical group diagnosed with ADHD. This indicates that the experimental group presents one of the main characteristics of the disorder. In addition, results also show that practically all the measured body parts present significant differences, being higher in the clinical group, highlighting the head as the joint with the highest effect size.

scholarly journals Perception on Prolonged Standing Work in Electronic Manufacturing Company

2018 ◽  
Vol 7 (3.24) ◽  
pp. 44
Author(s):  
Norlizaa Mohamad ◽  
Jafri Mohd Rohani ◽  
Ismail Abdul Rahman ◽  
Anis Amira Mat Zuki
Keyword(s):  
Good Health ◽  
Body Part ◽  
Health Condition ◽  
The Body ◽  
Body Region ◽  
Body Parts ◽  
Prolonged Standing ◽  
Electronic Manufacturing ◽  
Strong Relation ◽  
Ergonomic Interventions

Prolonged standing is one of the common activities in electronic industry as the task requirement. Prolonged standing can cause discomfort on the body of the workers and can lead to injury and occupational disease. The purpose of this study is to investigate standing workers perception on the fatigue and the discomfort on their respective body region for 12 hours working time. The subjects are the 80 workers with a good health condition and at least 6 months tenure. The subject data are collected via questionnaires and Likert scale to define the discomfort, pain, and fatigue. The workers were interviewed regarding their job and perceived fatigue discomfort. The results show the domination of the lower body region with the higher mean at the lower back, legs, and foot ankle. No statistically significant differences were found between the job tenure and body part discomfort pain and fatigue. There is a significant relation between gender and discomfort pain on legs and foot ankle. The result also shows a strong relation between age and the discomfort body parts of thigh and foot ankle. The perceptions of the workers towards discomfort pain and fatigue cause by prolonged standing during performing the task. The results from this study will provide a view for industrial consultants or ergonomist with evidence to support for ergonomic interventions for prolonged standing activity such as job rotation and work-rest schedule. 

Semantics of Hawrami Body Part Terms

2012 ◽  
Vol 16 (3) ◽  
pp. 319-335
Author(s):  
Bistoon Abasi ◽  
Amer Gheitury
Keyword(s):  
Native Speakers ◽  
Body Part ◽  
Field Work ◽  
The Body ◽  
Body Parts ◽  
Human Beings ◽  
Long Time ◽  
Semantic Properties ◽  
Different Levels ◽  
Internal Body

Human body as a universal possession of human beings constitutes an interesting domain where questions regarding semantic categorisations might be sought crosslinguistically. In the following, we will attempt to describe the terms used to refer to the body in Hawrami, an Iranian language spoken in Paveh, a small township in the western province of Kermanshah near Iraqi borders. Due to the scarcity of written material, the inventory of 202 terms referring to external and internal body parts were obtained through a field work, which took a long time, and techniques, such as the “colouring task”, observation and recording the terms as used in ordinary conversations and informal interviews with native speakers. The semantic properties of the terms and the way they are related in a partonymy or locative relationship were also investigated. As far as universals of body part terms are concerned, while conforming to ‘depth principle’ concerning the number of levels each partonomy may consist of, Hawrami violates an important feature of this principle by not allowing transitive relations between different levels of partonomic hierarchies. In addition, Hawrami lacks a term for labelling the ‘whole’.

Body and emotion

2002 ◽  
Vol 10 (1-2) ◽  
pp. 341-367 ◽  
Author(s):  
Ning Yu
Keyword(s):  
Semantic Analysis ◽  
Cultural Models ◽  
Body Part ◽  
The Body ◽  
Body Parts ◽  
Emotional Experiences ◽  
Emotional Symptoms ◽  
Internal Organs ◽  
Internal Body ◽  
External Body

This study presents a semantic analysis of how emotions and emotional experiences are described in Chinese. It focuses on conventionalized expressions in Chinese, namely compounds and idioms, which contain body-part terms. The body-part terms are divided into two classes: those denoting external body parts and those denoting internal body parts or organs. It is found that, with a few exceptions, the expressions involving external body parts are originally metonymic, describing emotions in terms of their externally observable bodily events and processes. However, once conventionalized, these expressions are also used metaphorically regardless of emotional symptoms or gestures. The expressions involving internal organs evoke imaginary bodily images that are primarily metaphorical. It is found that the metaphors, though imaginary in nature, are not really all arbitrary. They seem to have a bodily or psychological basis, although they are inevitably influenced by cultural models.

Determination and transdetermination in imaginal disks of Drosophila (Summary only)

1970 ◽  
Vol 176 (1044) ◽  
pp. 291-293
Keyword(s):  
Single Cells ◽  
Body Part ◽  
Cell Types ◽  
Structural Features ◽  
Theoretical Concept ◽  
Body Cavity ◽  
The Body ◽  
Body Region ◽  
Body Parts ◽  
Imaginal Disks

It is generally assumed that in multicellular organisms the diversity of the different cell types is the result of different gene activity which becomes manifest in the course of development. This theoretical concept of cell differentiation was developed on the basis of results obtained from a relatively small number of suitable experimental systems. One of them comprises the imaginal disks of the fruitfly Drosophila melanogaster . Imaginal disks are larval primordia in holometabolic insects such as flies and mosquitoes, and consist of densely packed populations of morphologically uniform cells. They give rise to defined structures of the adult body (mainly integument), thus replacing parts of the larva which are almost completely histolysed during metamorphosis. The prospective fate of the various imaginal disks can be tested, for example, by transplantation experiments. Individual disks are removed from larvae of a genetically marked strain and transplanted into the body cavity of another larva with which the transplants undergo metamorphosis. The metamorphosed derivatives of the disks are then found in the abdomen of the fly and can be microscopically identified on the basis of the morphology of bristles, hairs and other structural features of the integument. The same method is applied for examination of the developmental performance of disk fragments. From the results of such experiments the following conclusions are drawn: (1) Individual disks of fully grown larvae, that is larvae which are ready to pupate, are determined (programmed) for exactly defined body parts of the adult organism. (2) The individual subregions of such a body part can be localized precisely within a disk. Based on these facts fate maps (anlage plans) can be worked out. (3) From experiments in which different genetically marked disks are intermingled and then transplanted into larvae it is concluded that even single cells are determined for structures of a specific body region.

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