Neurobiological Pathways

The primary mechanisms, including psychological, behavioral, and neurobiological pathways, through which exercise may exert positive effects on SUD recovery and relapse prevention have been and continue to be extensively investigated

Linke frames neurobiological pathways as one of three coordinate explanatory registers through which exercise-based interventions act on substance use disorder, situating the term at the centre of a translational mechanistic agenda.

Linke, Sarah E., Exercise-based treatments for substance use disorders: evidence, theory, and practicality, 2015thesis

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Multiple psychiatric comorbidities, including depression and anxiety, are thought to be mediated in part by shared neurobiological pathways that are also implicated in the pathophysiology of ADHD

Faraone advances the argument that shared neurobiological pathways link ADHD to its psychiatric comorbidities, with direct implications for psychostimulant treatment and drug interaction risk.

Faraone, Stephen V., The pharmacology of amphetamine and methylphenidate: Relevance to the neurobiology of attention-deficit/hyperactivity disorder and other psychiatric comorbidities, 2018thesis

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dissociation, a descriptive term derived entirely from clinical observation, may turn out to be an accurate term for a neurobiological phenomenon as well. Future investigations are required to determine whether terror operates by a similar mechanism to inactivate cortical associative pathways

Herman proposes that dissociation—classically a clinical and psychological concept—may map directly onto the inactivation of cortical associative pathways, bridging phenomenological description and neurobiological substrate.

Herman, Judith Lewis, Trauma and Recovery: The Aftermath of Violence—From Domestic Abuse to Political Terror, 1992thesis

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the stage in which the individual reinstates drug-seeking behaviour after abstinence remains a focus for identifying neurobiological mechanisms of relapse and the development of medications for treatment

Koob identifies the preoccupation/anticipation stage of addiction as the primary site for investigating neurobiological mechanisms, centring prefrontal-to-mesolimbic glutamatergic projections as the pathway architecture underlying relapse.

Koob, George F., Neurobiology of addiction: a neurocircuitry analysis, 2016thesis

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Attachment theory conceptualizes the foundations of human sociability in complex neurobiological systems that cause infants to seek closeness with their caretakers when frightened or under stress

Herman, drawing on Bowlby, grounds attachment theory in neurobiological systems, arguing that the infant’s proximity-seeking response to threat is constitutively encoded in pathway-level circuitry shared across species.

Herman, Judith Lewis, Trauma and Recovery: The Aftermath of Violence—From Domestic Abuse to Political Terror, 1992thesis

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At the neurobiological level, Meth use disorder is characterised by a profound dysregulation of key neurotransmitter systems, primarily involving the dopamine (DA) and glutamate Glu pathways

Li identifies dopaminergic and glutamatergic pathways as the primary neurobiological axes disrupted by methamphetamine, situating pathway dysregulation as the mechanistic core of use disorder.

Li, Yongting, Exercise as a Promising Adjunct Treatment for Methamphetamine Addiction: Advances in Understanding Neuroplasticity and Clinical Applications, 2025supporting

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presynaptic vesicular Glu transporters regulate Glu concentration, acting as a molecular switch for relapse behaviour after abstinence

Li traces methamphetamine-induced pathway disruption to the molecular level, showing how glutamate transporter regulation constitutes a discrete switch-point within the circuitry governing relapse.

Li, Yongting, Exercise as a Promising Adjunct Treatment for Methamphetamine Addiction: Advances in Understanding Neuroplasticity and Clinical Applications, 2025supporting

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chronic exposure to various drugs of abuse increases the activation of cAMP response element binding protein in the nucleus accumbens and deactivates it in the central nucleus of the amygdala

Koob documents pathway-level molecular neuroadaptations in the accumbens-amygdala axis—via cAMP/PKA signalling and CREB—that underlie the transition from reward to withdrawal dysphoria in addiction.

Koob, George F., Neurobiology of addiction: a neurocircuitry analysis, 2016supporting

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Once neuronal pathways have been imprinted, they cannot spontaneously reverse or deconstruct themselves. Neuroplastic change is ‘the ability of the nervous system to change its activity in response to intrinsic or extrinsic stimuli by reorganizing its structure, functions, or connections.’

Sugden argues that imprinted neuronal pathways in substance use disorders require deliberate lifestyle intervention to undergo neuroplastic reorganisation, given their resistance to spontaneous reversal.

Sugden, Steven G, Strengthening Neuroplasticity in Substance Use Recovery Through Lifestyle Intervention, 2023supporting

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the occurrence and progression of Meth use disorder are closely associated with neurobiological changes and social environmental factors, exercise, as a safe and easily implementable non-pharmacological intervention, has demonstrated potential value

Li positions exercise as a pathway-targeted, non-pharmacological intervention whose value derives precisely from its capacity to address neurobiological changes at the circuit level.

Li, Yongting, Exercise as a Promising Adjunct Treatment for Methamphetamine Addiction: Advances in Understanding Neuroplasticity and Clinical Applications, 2025supporting

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The study of neural pathways, without a thorough consideration of their functions, is mere anatomy—albeit it constrains what brain circuits are capable of doing!

Panksepp insists that pathway anatomy is a necessary but insufficient framework—functional and behavioural dimensions must be integrated to yield genuine understanding of emotional circuitry.

Panksepp, Jaak, Affective Neuroscience The Foundations of Human and Animal, 1998supporting

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information from peripheral receptors ascends via two different pathways, the A-β-fiber discriminative pathway that conveys precise information about the ‘what’ and ‘where’ of the stimulus impinging on the body, and the C-fiber pathway that conveys spatially- and time-integrated affective information

Paulus specifies the dual ascending interoceptive pathway architecture—discriminative A-β and affective C-fiber—as the neurobiological basis for body-prediction error models in drug addiction.

Paulus, Martin P., The role of interoception and alliesthesia in addiction, 2009supporting

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Which, then, are the neurotransmitters that directly convey the signal of fear through the neuroaxis? There are several possible candidates.

Panksepp frames the identification of fear-pathway transmitters as an open empirical question, signalling that neurochemical pathway specification in emotion remains a work in progress.

Panksepp, Jaak, Affective Neuroscience The Foundations of Human and Animal, 1998supporting

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DA neurons typically fire in a fairly rhythmic pattern, with two or three spikes at a time, diminishing spike amplitudes, and longer than normal durations of the action potentials. It is worth noting again that DA neurons have endogenous pacemaker activities.

Panksepp characterises the electrophysiological signature of DA pathway neurons, demonstrating that the SEEKING system’s pathway-level dynamics include tonic pacemaker activity that primes behavioural arousal.

Panksepp, Jaak, Affective Neuroscience The Foundations of Human and Animal, 1998supporting

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a class of molecules called neurexins are neural recognition molecules that exist as proteins on nerve membranes and help guide the construction of the nervous system

Panksepp situates pathway formation in developmental molecular biology, linking neurexin-guided axonal growth and neurotrophic factors to the construction of specific emotional neural systems.

Panksepp, Jaak, Affective Neuroscience The Foundations of Human and Animal, 1998supporting

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Certain kinds of cortical neurons are often described as feature detectors because they respond preferentially (fire above their base rate) to various types of stimuli, such as edges, lines, and moving spots.

Thompson uses cortical feature-detector neurons as a neurobiological example to interrogate the heteronomy/autonomy distinction in information processing, implicitly raising questions about how pathway function is interpreted from inside versus outside the system.

Thompson, Evan, Mind in Life: Biology, Phenomenology, and the Sciences of Mind, 2007aside

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abnormalities in neuroendocrine function associated with ELS are highly variable and likely dependent upon the nature of abuse, developmental timing and duration of stress exposure, concomitant stress and psychopathology

Lanius signals that early life stress does not produce uniform pathway dysregulation but context-dependent neuroendocrine variability, complicating any simple pathway-to-disorder mapping.

Lanius, edited by Ruth A, The impact of early life trauma on health and disease the, 2010aside

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