Emphasizing Mechanical Feedback in Bio-Inspired Design and Education

2011 ◽  
Author(s):  
Justin Seipel
Keyword(s):  
Feedback Control ◽  
The Body ◽  
The Self ◽  
Biological Research ◽  
Biologically Inspired ◽  
System Architectures ◽  
Mechanical Control ◽  
Conventional View ◽  
Neural Feedback ◽  
Mechanical Feedback

Mechanical feedback in nature is a useful concept proposed by many researchers in different areas of biological research. The concept, at its core, is simply the idea that many mechanical processes in biology effectively act to assist in the self-stabilization of tasks, and therefore, serve functionally as a first level of feedback control. However, due to a conventional view of the nervous system as the ‘controller’ of the body, it has historically been assumed that the control of tasks does not critically depend on the self-stability properties of the mechanical (musculo-skeletal) system. More recent biological research has provided many examples that show neural feedback alone is not sufficient to control many tasks. This forces us to reframe our conventional view of feedback control in neuro-mechanical systems, and by extension, provide a more appropriate perspective when designing biologically-inspired system architectures. Here two ways of diagraming neuro-mechanical control are compared to understand whether one may be more helpful in framing neuro-mechanical control problems and biologically-inspired system design for engineering practitioners and students. This work, when developed further, is expected to provide new pedagogical frameworks for teaching neuromechanics, motor-control, and biologically-inspired methods of control.

scholarly journals Stability in a frontal plane model of balance requires coupled changes to postural configuration and neural feedback control

2011 ◽  
Vol 106 (1) ◽  
pp. 437-448 ◽  
Author(s):  
Jeffrey T. Bingham ◽  
Julia T. Choi ◽  
Lena H. Ting
Keyword(s):  
Feedback Control ◽  
Frontal Plane ◽  
Delayed Feedback ◽  
The Body ◽  
Joint Torque ◽  
Plane Model ◽  
Postural Responses ◽  
Gain Margin ◽  
Lift Off ◽  
Neural Feedback

Postural stability depends on interactions between the musculoskeletal system and neural control mechanisms. We present a frontal plane model stabilized by delayed feedback to analyze the effects of altered stance width on postural responses to perturbations. We hypothesized that changing stance width alters the mechanical dynamics of the body and limits the range of delayed feedback gains that produce stable postural behaviors. Surprisingly, mechanical stability was found to decrease as stance width increased due to decreased effective inertia. Furthermore, due to sensorimotor delays and increased leverage of hip joint torque on center-of-mass motion, the magnitudes of the stabilizing delayed feedback gains decreased as stance width increased. Moreover, the ranges of the stable feedback gains were nonoverlapping across different stance widths such that using a single neural feedback control strategy at both narrow and wide stances could lead to instability. The set of stable feedback gains was further reduced by constraints on foot lift-off and perturbation magnitude. Simulations were fit to experimentally measured kinematics, and the identified feedback gains corroborated model predictions. In addition, analytical gain margin of the linearized system was found to predict step transitions without the need for simulation. In conclusion, this model offers a method to dissociate the complex interactions between postural configuration, delayed sensorimotor feedback, and nonlinear foot lift-off constraints. The model demonstrates that stability at wide stances can only be achieved if delayed neural feedback gains decrease. This model may be useful in explaining both expected and paradoxical changes in stance width in healthy and neurologically impaired individuals.

scholarly journals A single muscle's multifunctional control potential of body dynamics for postural control and running

2011 ◽  
Vol 366 (1570) ◽  
pp. 1592-1605 ◽  
Author(s):  
Simon Sponberg ◽  
Andrew J. Spence ◽  
Chris H. Mullens ◽  
Robert J. Full
Keyword(s):  
Postural Control ◽  
High Speed ◽  
Vertical Plane ◽  
Motor Units ◽  
The Body ◽  
Feedback Signal ◽  
Control Potential ◽  
Body Dynamics ◽  
Neural Feedback ◽  
Mechanical Feedback

A neuromechanical approach to control requires understanding how mechanics alters the potential of neural feedback to control body dynamics. Here, we rewrite activation of individual motor units of a behaving animal to mimic the effects of neural feedback without concomitant changes in other muscles. We target a putative control muscle in the cockroach, Blaberus discoidalis (L.), and simultaneously capture limb and body dynamics through high-speed videography and a micro-accelerometer backpack. We test four neuromechanical control hypotheses. We supported the hypothesis that mechanics linearly translates neural feedback into accelerations and rotations during static postural control. However, during running, the same neural feedback produced a nonlinear acceleration control potential restricted to the vertical plane. Using this, we reject the hypothesis from previous work that this muscle acts primarily to absorb energy from the body. The conversion of the control potential is paralleled by nonlinear changes in limb kinematics, supporting the hypothesis that significant mechanical feedback filters the graded neural feedback for running control. Finally, we insert the same neural feedback signal but at different phases in the dynamics. In this context, mechanical feedback enables turning by changing the timing and direction of the accelerations produced by the graded neural feedback.

‘A pinch of unseen, unguarded dust’: The World and Self in Thomas Hardy's Poems

2018 ◽  
Vol 8 (1) ◽  
pp. 49-66
Author(s):  
Monika Szuba
Keyword(s):  
The Body ◽  
The Self ◽  
Phenomenological Philosophy ◽  
The Earth ◽  
The World ◽  
The Universe ◽  
Recurrent Theme ◽  
Body Subject

The essay discusses selected poems from Thomas Hardy's vast body of poetry, focusing on representations of the self and the world. Employing Maurice Merleau-Ponty's concepts such as the body-subject, wild being, flesh, and reversibility, the essay offers an analysis of Hardy's poems in the light of phenomenological philosophy. It argues that far from demonstrating ‘cosmic indifference’, Hardy's poetry offers a sympathetic vision of interrelations governing the universe. The attunement with voices of the Earth foregrounded in the poems enables the self's entanglement in the flesh of the world, a chiasmatic intertwining of beings inserted between the leaves of the world. The relation of the self with the world is established through the act of perception, mainly visual and aural, when the body becomes intertwined with the world, thus resulting in a powerful welding. Such moments of vision are brief and elusive, which enhances a sense of transitoriness, and, yet, they are also timeless as the self becomes immersed in the experience. As time is a recurrent theme in Hardy's poetry, this essay discusses it in the context of dwelling, the provisionality of which is demonstrated in the prevalent sense of temporality, marked by seasons and birdsong, which underline the rhythms of the world.

Epilogue

2017 ◽  
Author(s):  
Joshua S. Walden
Keyword(s):  
The Body ◽  
The Self ◽  
The Individual ◽  
Relationship Of ◽  
The Relationship

The book’s epilogue explores the place of musical portraiture in the context of posthumous depictions of the deceased, and in relation to the so-called posthuman condition, which describes contemporary changes in the relationship of the individual with such aspects of life as technology and the body. It first examines Alfred Hitchcock’s Vertigo to view how Bernard Herrmann’s score relates to issues of portraiture and the depiction of the identity of the deceased. It then considers the work of cyborg composer-artist Neil Harbisson, who has aimed, through the use of new capabilities of hybridity between the body and technology, to convey something akin to visual likeness in his series of Sound Portraits. The epilogue shows how an examination of contemporary views of posthumous and posthuman identities helps to illuminate the ways music represents the self throughout the genre of musical portraiture.

Effect of Exposure to Photographs of Thin Models on Self-Consciousness in Female College Students

2000 ◽  
Vol 86 (3_part_2) ◽  
pp. 1149-1154 ◽  
Author(s):  
Brandy S. Wegner ◽  
Anita M. Hartmann ◽  
C. R. Geist
Keyword(s):  
College Students ◽  
College Women ◽  
Print Media ◽  
The Body ◽  
The Self ◽  
Female College Students ◽  
Female College ◽  
Body Self

The purpose of this study was to assess the immediate influence of brief exposure to images taken from print media on the general self-consciousness and body self-consciousness of 67 college women. After viewing photographs of either thin female models or control photographs, the women completed the Self-consciousness Scale and the Body Self-consciousness Questionnaire. Although a was .45, the college women who looked at images of thin female models gave immediate ratings significantly ( p < .001) higher on both general Self-consciousness and Body Self-consciousness than those who looked at control images.

The Spiritualization of Politics and the Technologies of Resistant Body

2021 ◽  
Vol 17 (2) ◽  
pp. 193-211
Author(s):  
Ashjan Ajour
Keyword(s):  
The Body ◽  
The Self ◽  
Political Prisoners ◽  
Decisive Factor ◽  
Political Strategy ◽  
Colonial Power ◽  
Hunger Strike ◽  
Technologies Of The Self ◽  
Principal Tool ◽  
A Site

Abstract This article explores the body as a site of subjectivity production during a hunger strike in Occupied Palestine. It further explores the former political prisoners’ theory of subjectivity as it emerges through their praxis and philosophy of freedom. Although the body is the principal tool that the hunger strikers use, they don't consider it the decisive factor in attaining their goal. For that they build on the immaterial strength that develops with the deterioration of the body and from which they construct the concept of rouh (soul). This is expressed through the formation of contradictory binaries: body versus soul and body versus mind. The article shows that the hunger strike not only is a political strategy for liberation; it also moves into a spiritualization of the struggle. It uses and problematizes Foucault's “technologies of the self” to theorize the specific formation of subjectivity in the Palestinian hunger strike under colonial conditions, and it contributes to theories of subjectivation. The hunger strikers, in their interaction with the dispossession of the colonial power, invent technologies of resistance to transcend the colonial and carceral constraints on their freedom and create the capacity for the transformation from a submissive subject to a resistant one.

Subjects of Technology: An Auto-Archeology of Attention Deficit Disorder in Neoliberal Time(s)

2018 ◽  
Vol 19 (2) ◽  
pp. 105-115
Author(s):  
Joshua S. Hanan
Keyword(s):  
Learning Disability ◽  
Attention Deficit ◽  
Attention Deficit Disorder ◽  
Family Members ◽  
The Body ◽  
The Self ◽  
Psychiatric Diagnoses ◽  
Critical Perspective ◽  
Close Family

This essay (re)presents my own experiences living with attention deficit disorder (ADD) as a child and adult to provide a radically historical, contextual, and critical autoethnographic conceptualization of this “learning disability.” Specifically, by building upon Ragan Fox’s “auto-archeological” method, a critical perspective that “unite[s] autoethnography and Foucault’s theories of discourse,” I draw upon institutional artifacts, psychiatric diagnoses, and interviews with close family members to show that ADD is a “technology of the self” that economizes the body in accordance with a distinctly neoliberal temporality. This temporalizing process, I show, is reinforced by a range of other neoliberal technologies of selfhood and ultimately cultivates the very “deficit framework” that ADD diagnoses are aimed at healing. The conclusion questions the legitimacy of ADD outside of the various technological interfaces that make the disability visible as a public problem and considers the intimate connections between neoliberalism, ableism, and the contemporary university.

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