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Embodying the Self: Neurophysiological Perspectives on the Psychopathology of Anomalous Bodily Experiences

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Book Series: Frontiers Research Topics ISSN: 16648714 ISBN: 9782889454563 Year: Pages: 174 DOI: 10.3389/978-2-88945-456-3 Language: English
Publisher: Frontiers Media SA
Subject: Science (General) --- Neurology
Added to DOAB on : 2018-11-16 17:17:57
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Since the beginning of the 20th Century, phenomenology has developed a distinction between lived body (Leib) and physical body (Koerper), a distinction well known as body-subject vs. body-object (Hanna and Thompson 2007). The lived body is the body experienced from within - my own direct experience of my body lived in the first-person perspective, myself as a spatiotemporal embodied agent in the world. The physical body on the other hand, is the body thematically investigated from a third person perspective by natural sciences as anatomy and physiology. An active topic affecting the understanding of several psychopathological disorders is the relatively unknown dynamic existing between aspects related to the body-object (that comprises the neurobiological substrate of the disease) and the body-subject (the experiences reported by patients) (Nelson and Sass 2017). A clue testifying the need to better explore this dynamic in the psychopathological context is the marked gap that still exists between patients’ clinical reports (generally entailing disturbing experiences) and etiopathogenetic theories and therapeutic practices, that are mainly postulated at a bodily/brain level of description and analysis. The phenomenological exploration typically targets descriptions of persons’ lived experience. For instance, patients suffering from schizophrenia may describe their thoughts as alien (‘‘thoughts are intruding into my head’’) and the world surrounding them as fragmented (‘‘the world is a series of snapshots’’) (Stanghellini et al., 2015). The result is a rich and detailed collection of the patients’ qualitative self-descriptions (Stanghellini and Rossi, 2014), that reveal fundamental changes in the structure of experiencing and can be captured by using specific assessment tools (Parnas et al. 2005; Sass et al. 2017; Stanghellini et al., 2014).The practice of considering the objective and the subjective levels of analysis as separated in the research studies design has many unintended consequences. Primarily, it has the effect of limiting actionable neuroscientific progress within clinical practice. This holds true both in terms of availability of evidence-based treatments for the disorders, as well as for early diagnosis purposes. In response to this need, this collection of articles aims to promote an interdisciplinary endeavor to better connect the bodily, objective level of analysis with its experiential corollary. This is accomplished by focusing on the convergence between (neuro) physiological evidence and the phenomenological manifestations of anomalous bodily experiences present in different disorders.

The Insect Central Complex - From Sensory Coding to Directing Movement

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Book Series: Frontiers Research Topics ISSN: 16648714 ISBN: 9782889455782 Year: Pages: 179 DOI: 10.3389/978-2-88945-578-2 Language: English
Publisher: Frontiers Media SA
Subject: Science (General) --- Neurology
Added to DOAB on : 2019-01-23 14:53:43
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The most fundamental function of the brain is the analysis and integration of sensory information in order to generate motor commands that result in directed, meaningful interactions with the environment. This process can be viewed as an internal comparison between the current state of the world and a desired state of the world, with any mismatch leading to compensatory action. For an animal to respond to external stimuli in a directed way in any given sensory situation, it first has to assess the orientation of its body with reference to the environment. The current body position computed in this way then has to be matched against the desired position, and any resulting discrepancy has to be compensated for by a change in limb position, movement direction, or a transition to a new movement mode. The desired body orientation depends on many different parameters, such as the animal’s nutritional state, its reproductive status, the time of day, the current behavioral state, or previous experience. Vertebrate brains process these parameters across diverse brain regions, involving millions of neurons, a fact that makes pinpointing the underlying circuitry a daunting endeavor.Across insects, a single brain area, the central complex, is involved in many of the mentioned fundamental processes: It contains an ordered array of head direction cells, its neurons are targeted by multisensory input pathways, visual and spatial memories reside in this region, and certain central-complex neurons are active just before movements of the animal, predicting its future turning direction. Additionally, state-dependent changes of neural response characteristics and a vast supply of neuromodulators suggests a highly dynamic, context-dependent remodeling of local circuitry. All of this places the central complex at the interface of sensory processing and motor planning, providing a location at which current and desired heading could be compared and adequate action can be selected in response. The highly regular, almost crystalline neuroarchitecture of this region has the advantage of enabling us to immediately connect structure with function - at the level of identified, individual neurons. The neural algorithms implemented in the circuitry that mediate action selection are thus uniquely accessible in this brain region. This research topic therefore aims at connecting the diverse aspects of central-complex function and develop an open-source framework in which to embed current knowledge (reviews) and novel findings from biological, theoretical, and engineering perspectives (original research articles, short communications). Four complementary sub-topics provide the main focus: 1) The current state of the world - Encoding and integration of sensory information; 2) Generating behavior - Motor planning and neural correlates of behavior; 3) Computing the desired state of the world - Integration of internal state, memory, and behavioral state; 4) Neural hardware and algorithms - The underlying circuits and computations of the central complex. By illuminating structure-function relations on multiple levels in diverse species, within a brain region that is omnipresent across insects, we aim at exposing fundamental principles that enable animals to generate adaptive behavior despite inhabiting a world of an infinite number of possible sensory scenarios.

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