Nervous System

nervous systems began their existence as assistants to the body, as coordinators of the life process in bodies complex and diversified enough that the functional articulation of tissues, organs, and systems… required a dedicated system to accomplish the coordination.

Damasio’s foundational argument: the nervous system’s primary evolutionary role is homeostatic coordination of a complex body, not the generation of mental life, which is only a consequential by-product.

Damasio, Antonio R., The strange order of things life, feeling, and the making, 2018thesis

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Feelings are, through and through, simultaneously and interactingly, phenomena of both bodies and nervous systems. The Continuity of Bodies and Nervous Systems.

Damasio argues that feelings cannot be reduced to purely neural events — bodies and nervous systems form an inseparable, interactive continuum in the production of affective experience.

Damasio, Antonio R., The strange order of things life, feeling, and the making, 2018thesis

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Elaborate life processes can well exist without nervous systems, but elaborate multicellular organisms need nervous systems to run their lives.

Damasio establishes the nervous system as the necessary coordinator of complex multicellular life, responsible for movement, interoception, and the image-making capacity that eventually yields consciousness.

Damasio, Antonio R., The strange order of things life, feeling, and the making, 2018thesis

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for pain itself to emerge, as a mental experience, the organism needed to have a mind and that for that to pass, the organism needed a nervous system capable of mapping structures and events.

Damasio argues that felt experience — including pain — requires a nervous system capable of representational mapping, distinguishing mere emotive processes (pre-nervous) from genuine feelings.

Damasio, Antonio R., The strange order of things life, feeling, and the making, 2018thesis

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By investigating the evolution of the autonomic nervous system, we may gain insight into the interface between autonomic function and facial expression. The polyvagal theory of emotion is derived from investigations of the evolution of the autonomic nervous system.

Porges grounds his theory of emotion and social engagement in the phylogenetic development of the autonomic nervous system, treating evolutionary history as the explanatory key to affective expression.

Porges, Stephen W., The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment, Communication, and Self-Regulation, 2011thesis

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immune systems belong to the special class of global organism system that includes the circulatory system, the endocrine system, and the nervous system… The nervous system gradually assumes the role of master coordi[nator].

Damasio situates the nervous system within a broader ecology of homeostatic systems — immune, circulatory, endocrine — clarifying its distinctive role as the organism’s master coordinator.

Damasio, Antonio R., The strange order of things life, feeling, and the making, 2018supporting

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The nets also do visceral regulation, a sort of beginner’s autonomic nervous system, they run locomotion, and they coordinate all of these functions.

Damasio traces the autonomic nervous system’s origins to the primitive nerve nets of hydras, establishing an evolutionary continuum from basic visceral regulation to the complex autonomic hierarchies of vertebrates.

Damasio, Antonio R., The strange order of things life, feeling, and the making, 2018supporting

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The autonomic nervous system shapes the way you experience your life. Beliefs, behaviors, and body responses are embedded in the autonomic hierarchy. Physiology and psychology are interconnected.

Dana applies Polyvagal Theory clinically, asserting that the autonomic nervous system is not a background physiological mechanism but the primary shaper of subjective experience, belief, and behavior.

Deb A Dana, Deb Dana, Polyvagal Exercises for Safety and Connection A Guide for, 2018thesis

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The activation of the sympathetic nervous system, evolutionarily more primitive and less flexible than the social engagement system, increases overall arousal and mobilizes survival mechanisms (flight and fight behaviors) in response to threat.

Ogden maps the nervous system’s evolutionary hierarchy onto trauma response, showing how sympathetic activation overrides the more recently evolved social engagement system under perceived threat.

Ogden, Pat, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006supporting

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the very anatomy and operation of the ‘wires’ is quite distinct, especially in regard to the old chemical/visceral interior… The ‘interior’ and the nervous system form an interactive complex; the ‘exterior’ and the nervous system do not.

Damasio argues that the nervous system’s relationship to the body’s interior is uniquely bidirectional and chemically intimate, distinguishing interoceptive signaling from the organism’s engagement with the external environment.

Damasio, Antonio R., The strange order of things life, feeling, and the making, 2018supporting

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the evolution of the nervous system limits or expands the ability to express emotions, which in turn may determine proximity, social contact, and the quality of communication.

Porges argues that the evolutionary architecture of the nervous system directly constrains or enables the emotional and social capacities available to a given organism.

Porges, Stephen W., The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment, Communication, and Self-Regulation, 2011supporting

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the neural surveillance job of interoception is heir to an earlier and more primitive system that permits chemical molecules traveling in the blood to act directly on both central and peripheral nerve structures.

Damasio traces interoception’s evolutionary ancestry to pre-neural chemical signaling, demonstrating the deep continuity between body-chemistry and nervous-system surveillance of internal states.

Damasio, Antonio R., The strange order of things life, feeling, and the making, 2018supporting

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it is to nervous systems so richly equipped and capable that the ability to feel is eventually conferred, as a coveted prize for achievements in mapping and imaging of internal states.

Damasio frames felt experience as an achievement conferred on sufficiently complex nervous systems, earned through progressive elaboration of internal-state mapping capacities.

Damasio, Antonio R., The strange order of things life, feeling, and the making, 2018supporting

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the overall purpose of the central nervous system… is to receive sensory information from the skin through bundles of long nerve fibers, called axons, and to transform it into coordinated motor commands that are relayed to the muscles for action.

Kandel provides the foundational neuroscientific description of the central nervous system’s core function as sensorimotor transformation, grounding psychological theorizing in structural anatomy.

Kandel, Eric R., In search of memory the emergence of a new science of mind, 2006supporting

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Ephapsis is usually not considered in the operation of nervous systems, especially nervous systems such as ours… It is intriguing to consider that the fibers in the vagus nerve, the main conduit of neural signaling from the entire thorax and abdomen to the brain, are almost all unmyelinated.

Damasio raises the neglected mechanism of ephaptic transmission in unmyelinated vagal fibers as a potential contributor to the interoceptive signaling that underlies feeling states.

Damasio, Antonio R., The strange order of things life, feeling, and the making, 2018supporting

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The width of a window of tolerance is directly related to how much stimulation is required to elicit the ‘threshold of response.’ When the threshold is low, a person’s nervous system is aroused with very little input.

Ogden links the clinical concept of the window of tolerance directly to individual differences in nervous-system arousal thresholds, operationalizing neurological variability for psychotherapeutic practice.

Ogden, Pat, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006supporting

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motor system: The part of the nervous system that mediates movement and other active functions, as opposed to the sensory sys[tem].

Kandel’s glossary entry grounds the functional division of the nervous system into motor and sensory subsystems, foundational terminology for clinical and theoretical applications across the corpus.

Kandel, Eric R., In search of memory the emergence of a new science of mind, 2006supporting

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The social engagement branch of the nervous system is probably both cardioprotective and immuno-protective. This may be why individuals with strong personal affiliations live longer, healthier lives.

Levine extends Polyvagal-informed thinking to argue that the social engagement branch of the nervous system confers measurable physiological health benefits, bridging neuroscience and relational psychology.

Levine, Peter A., In an Unspoken Voice: How the Body Releases Trauma and Restores Goodness, 2010supporting

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One division of the central nervous system to which I will refer often is both cortical and subcortical and is known as the limbic system… The nervous (or neural) tissue is made up of nerve

Damasio introduces the limbic system as a key subdivision of the central nervous system relevant to emotion and reason, situating it within the broader neuroanatomical context of his somatic-marker theory.

Damasio, Antonio R., Descartes’ Error: Emotion, Reason, and the Human Brain, 1994supporting

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the sympathetic component of the autonomic nervous system, which supports fight-or-flight behaviors, would be hyperaroused; and the parasympathetic component, which supports calm visceral states and social engagement behaviors, would be depressed.

Porges applies Polyvagal Theory to borderline personality disorder by formulating testable predictions about asymmetric dysregulation across autonomic nervous system branches.

Porges, Stephen W., The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment, Communication, and Self-Regulation, 2011supporting

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The ability to respond to and recover from the challenges of daily living is a marker of well-being and depends on the actions of the autonomic nervous system.

Dana establishes autonomic nervous system flexibility — the capacity to respond and recover — as the neurophysiological foundation of psychological well-being in Polyvagal-informed clinical practice.

Deb A Dana, Deb Dana, Polyvagal Exercises for Safety and Connection A Guide for, 2018supporting

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central nervous system: One of the two divisions of the nervous system, the other being the peripheral nervous system. The central nervous system includes the brain and the spinal cord. Although anatomically distinct, the central and peripheral nervous systems are functionally interconnected.

Kandel’s definitional entry establishes the anatomical partition between central and peripheral nervous systems while emphasizing their functional interdependence — a distinction bearing on all clinical and theoretical frameworks in the corpus.

Kandel, Eric R., In search of memory the emergence of a new science of mind, 2006aside

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The entrenched dualism that began in Athens, was grandfathered by Descartes, resisted Spinoza’s broadside, and has been fiercely exploited by the computational sciences is a position whose time has passed.

Damasio situates his biologically integrated account of the nervous system as a decisive refutation of the mind-body dualism that has historically obscured the body’s constitutive role in mental life.

Damasio, Antonio R., The strange order of things life, feeling, and the making, 2018aside

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