The anterior spinothalamic tract constitutes a vital ascending somatosensory conduit within the central nervous system, mediating non-discriminative tactile sensation and gentle pressure from the peripheral mechanoreceptors to higher cortical processing centers. Understanding the structural trajectory and physiological integration of this pathway provides fundamental insights into somatosensory organization, sensory dissociation phenomena, and neurological localization in clinical medicine. As a primary division of the anterolateral system, this tract highlights the evolutionary specialization of ascending spinal networks dedicated to homeostatic and exteroceptive perception.
Anterior Spinothalamic Tract
1. Concise Definition
The anterior spinothalamic tract (also designated the ventral spinothalamic tract) is an ascending sensory nerve pathway situated within the anterior funiculus of the spinal cord that transmits exteroceptive information regarding crude (non-discriminative) touch, firm pressure, and gentle cutaneous stimulation from peripheral receptors to the thalamus. Serving as a crucial component of the anterolateral system, this tract decussates obliquely across the anterior white commissure of the spinal cord over one to two spinal segments before ascending toward the ventroposterolateral nucleus of the diencephalon.
Unlike the dorsal column-medial lemniscal system, which preserves high spatial fidelity, temporal precision, and two-point discrimination, the anterior spinothalamic tract provides generalized awareness of tactile stimuli without exact spatial localization. Working in tandem with its sister tract—the lateral spinothalamic tract, which carries thermal and nociceptive signals—the anterior pathway ensures that tactile stimuli are continuously monitored to maintain environmental contact awareness and preserve tactile-guided survival reflexes.
2. Etymology & Linguistic Origin
The nomenclature of the anterior spinothalamic tract derives directly from Classical Latin and Ancient Greek anatomical traditions. The modifier anterior stems from the Latin comparative form of ante, meaning “before” or “in front,” denoting the tract’s geographical positioning within the ventral or anterior funiculus of the spinal cord cross-section. The compound term spinothalamic merges two primary anatomical landmarks: the Latin spina, meaning “thorn,” “backbone,” or “spine,” and the Ancient Greek thalamos (θάλαμος), signifying an “inner chamber,” “bedroom,” or “receptacle.” In functional neuroanatomy, the combining form spino- denotes the point of origin within the spinal gray matter, while the suffix -thalamic indicates the terminal site within the diencephalic thalamus. The term tract arises from the Latin tractus, meaning “a drawing out,” “stretch,” or “course,” which denotes a contiguous bundle of nerve fibers sharing a common origin, path, and destination within the central neuraxis. The anatomical designation entered mainstream medical vernacular in the late nineteenth century as European neuroanatomists utilized myelin staining and lesion tracing to map discrete white matter pathways within the spinal cord.
3. Pronunciation & Grammatical Form
The term is pronounced phonetically as /ænˈtɪə.ri.ər ˌspaɪ.noʊ.θəˈlæm.ɪk trækt/ in standard American English and /ænˈtɪə.ri.ə ˌspaɪ.nəʊ.θəˈlæm.ɪk trækt/ in Received Pronunciation British English. Grammatically, “anterior spinothalamic tract” functions as a singular compound proper noun phrase. The components “anterior” and “spinothalamic” serve as attributive adjectives modifying the head noun “tract.” The plural form is rendered as “anterior spinothalamic tracts,” referencing both the bilateral tracts traversing each hemicord. In clinical literature, the tract is frequently abbreviated as AST or ASTT and is occasionally used interchangeably with the Latin anatomical designation tractus spinothalamicus anterior or tractus spinothalamicus ventralis.
4. Detailed Conceptual Explanation
The anterior spinothalamic tract functions as a primary pathway for protopathic tactile sensitivity. Protopathic sensations encompass crude touch, tactile sweeping, and light surface pressure that lack high tactile acuity, stereognostic value, or distinct two-point discrimination. Mechanistically, this pathway provides redundant tactile signaling that complements the epicritic processing handled by the dorsal column-medial lemniscal pathway. Because light touch is mediated simultaneously by both the anterior spinothalamic tract and the dorsal columns, an isolated lesion of either pathway rarely abolishes touch sensation entirely, producing instead subtle qualitative decrements in tactile acuity rather than complete cutaneous anesthesia.
The structural trajectory of the anterior spinothalamic tract follows a classic three-neuron ascending architecture:
- First-Order Neurons: Pseudounipolar sensory neurons located in the dorsal root ganglia (DRG) possess peripheral axonal terminals equipped with low-threshold mechanoreceptors, including Merkel discs, Meissner corpuscles, and peritrichial nerve endings around hair follicles. The central processes of these first-order neurons enter the spinal cord through the lateral division of the dorsal root entry zone. Upon entry, these primary afferent fibers segregate into the tract of Lissauer (dorsolateral fasciculus), where they bifurcate into ascending and descending collateral branches that traverse one to three spinal segments before terminating in the dorsal horn gray matter.
- Second-Order Neurons: The central terminals of first-order neurons form excitatory glutamatergic synapses with second-order projection neurons located predominantly within Rexed laminae IV, V, VI, and parts of I and VII in the dorsal horn. The axons arising from these second-order cells proceed anteromedially, crossing the midline within the anterior white commissure at an oblique angle over one to two spinal levels rostral to the entry segment. After decussation, the second-order axons turn rostrally within the anterior funiculus of the contralateral spinal cord, assembling into the ascending bundle immediately medial to the anterior spinocerebellar tract and ventral to the lateral spinothalamic tract. As this tract ascends through the brainstem, it converges with the lateral spinothalamic and spinotectal fibers to constitute the spinal lemniscus within the tegmentum of the medulla oblongata, pons, and midbrain.
- Third-Order Neurons: The majority of ascending fibers within the spinal lemniscus terminate by synapsing upon tertiary neurons within the ventral posterolateral (VPL) nucleus of the thalamus. Collateral projections also diverge toward intralaminar thalamic nuclei, the brainstem reticular formation, and the periaqueductal gray, subserving sensory arousal, general vigilance, and autonomic conditioning. Axons emerging from the tertiary neurons in the VPL nucleus traverse the posterior limb of the internal capsule and radiate through the corona radiata to synapse upon granular layer IV neurons within the primary somatosensory cortex (Brodmann areas 3b, 1, and 2) located on the postcentral gyrus, maintaining a distinct somatotopic somatosensory homunculus representation.
Somatotopic organization within the anterior spinothalamic tract exhibits a defined concentric layering. Due to the progressive accretion of ascending fibers from successively higher dermatomes, lower extremity fibers (sacral and lumbar divisions) are displaced laterally and superficially, whereas fibers from the upper extremities and trunk (thoracic and cervical divisions) locate progressively more medially and deeply near the margin of the anterior gray horn. This layered arrangement explains specific patterns of neurological preservation observed in spinal cord compressive syndromes.
5. Historical Development
The historical delineation of the spinothalamic system unfolded throughout the late nineteenth and early twentieth centuries through a convergence of comparative neuroanatomy, histological tract-tracing, and clinical-pathological correlation. Early nineteenth-century neurophysiologists, relying on the rudimentary animal transection models of François Magendie and Charles Bell, viewed the spinal white matter as an undifferentiated mass of ascending and descending conduits.
The first decisive breakthrough regarding sensory dissociation occurred through the work of the French neurologist Charles-Édouard Brown-Séquard in 1850. Brown-Séquard documented that hemisection of the spinal cord yielded an ipsilateral loss of motor function and fine tactile discrimination alongside a contralateral loss of pain and temperature sensibility. Although his earliest publications did not cleanly isolate the anterior spinothalamic tract from the lateral pathway, Brown-Séquard conclusively demonstrated that certain exteroceptive modalities cross within the spinal cord rather than ascending homolaterally to the brainstem.
Subsequent anatomical isolation was achieved by the German neurologist Ludwig Edinger in 1889, who introduced the specific designation Tractus spinothalamicus based on comparative neuroembryological and degeneration studies in reptiles and mammals. Soon after, Heinrich Adolf Goldscheider and Max Lewandowsky clarified that crude pressure and tactile sweeping survived extensive lesions confined to the posterior columns, suggesting the existence of a ventral ascending system running parallel to the lateral pain-temperature channel.
In the mid-twentieth century, neurosurgeons performing open anterolateral cordotomies for intractable malignant pain—pioneered by William G. Spiller and Edward Martin in 1912—refined our anatomical understanding of the anterior spinothalamic tract. Surgical lesions positioned too far ventrally in the anterior funiculus frequently altered light touch thresholds and evoked dysesthesias in addition to intended analgesia. Contemporary retrograde tracing methods using horseradish peroxidase and fluorogold, followed by contemporary in vivo diffusion tensor imaging (DTI), have conclusively confirmed the exact nuclear targets and multidimensional collateralization of the anterior spinothalamic tract.
6. Theoretical Foundations
The anterior spinothalamic tract occupies a foundational position within modern neurobiological models of sensory coding. Primary among these is the “dual-channel” somatosensory doctrine, formulated conceptually by Sir Henry Head in 1905 through his landmark self-experimentation on cutaneous nerve regeneration. Head distinguished between the phylogenetically older “protopathic” sensory apparatus—designed for crude perception, immediate behavioral relevance, and high affective tone—and the evolutionary newer “epicritic” apparatus, which provides high-resolution spatial localization, texture discrimination, and tactile recognition. Modern neuroscience places the anterior spinothalamic tract squarely within the protopathic domain, functioning as an ancient survival pathway that informs the organism of mechanical surface contact without expending neural computational resources on high-precision spatial mapping.
From an evolutionary perspective, the anterior spinothalamic tract represents an intermediary system between the diffuse visceral spinoreticular networks and the highly streamlined neocortical projection lines of the dorsal column-medial lemniscal system. Because non-discriminative touch serves as an early indicator of predatory contact, parasitic colonization, or structural obstacles, maintaining an uncrossed or rapidly crossing ventral pathway provided primitive vertebrates with an immediate means of eliciting reflex withdrawals or ascending arousal responses via reticulothalamic collaterals.
Furthermore, the anterior spinothalamic tract is central to theories of “sensory redundancy.” Somatosensory physiology relies on parallel distributed processing: mechanical deformation of skin stimulates both primary low-threshold mechanoreceptors that send fast-conducting A-beta fibers into the dorsal columns, as well as unmyelinated C-tactile afferents and thinly myelinated A-delta fibers that terminate within the dorsal horn laminae feeding the spinothalamic tracts. This computational overlap guarantees that acute damage to a single tract in the spinal cord does not produce catastrophic cutaneous anesthesia, allowing basic awareness of environmental contact to persist even when epicritic discrimination is completely abolished.
7. Key Components, Types & Dimensions
The anterior spinothalamic tract consists of several structurally and functionally distinct components that span multiple levels of the neuroaxis:
- Primary Mechanoreceptive Afferents: A combination of medium-diameter, thinly myelinated A-delta fibers and unmyelinated C-tactile (CT) afferents providing low-velocity, non-discriminative mechanical and pleasant contact sensation, terminating within the outer and neck regions of the dorsal horn.
- Dorsal Horn Origin Laminae: The second-order cell bodies are concentrated across Rexed Laminae IV and V (nucleus proprius), which receive direct cutaneous mechanoreceptive input, with secondary contributions from Lamina VII (interstitial zone) and Lamina I (marginal zone).
- Anterior White Commissure Decussation: The obligatory pathway of crossover whereby second-order axons angle anteromedially through the anterior white commissure, crossing the ventral midline immediately ventral to the central canal over one to two spinal metameres.
- Ascending Anterolateral Bundle: The structural column within the anterior funiculus of the spinal cord, situated medial to the anterior spinocerebellar tract, lateral to the anterior corticospinal tract, and ventral to the lateral spinothalamic tract.
- Spinal Lemniscus Convergence: The consolidated brainstem conduit formed in the medulla, where anterior spinothalamic fibers merge with lateral spinothalamic and spinotectal projections, running dorsolateral to the inferior olive and medial lemniscus.
- Collateral Projections: Divergent axon collaterals that separate from the primary ascending bundle to synapse upon the medullary and pontine reticular formation (mediating autonomic vigilance and arousal) and the midbrain periaqueductal gray (modulating intrinsic sensory gating).
- Diencephalic Terminus (VPL): The terminal arborizations within the ventroposterolateral nucleus of the dorsal thalamus, organized somatotopically to relay mechanical sensory impulses onward to the primary somatosensory cortex.
8. Examples & Illustrative Cases
Clinical scenarios demonstrate the structural trajectory and compensatory dynamics of the anterior spinothalamic tract across various neurological presentations:
- Case 1: Anterior Spinal Artery Syndrome (Spinal Stroke): A 68-year-old patient experiences sudden infarction of the anterior two-thirds of the spinal cord due to occlusion of the anterior spinal artery. Neurological examination reveals bilateral flaccid paraplegia (involvement of the anterior horns and corticospinal tracts) and complete loss of pain and temperature sensation below the lesion (damage to the lateral spinothalamic tracts). However, conscious touch perception is partially preserved because the posterior columns (supplied by the unaffected posterior spinal arteries) remain fully intact. The anterior spinothalamic tracts are destroyed bilaterally, manifesting as an inability to perceive light stroking with cotton wisp if the posterior columns are simultaneously saturated or compromised, showcasing the pathway’s selective vulnerability to anterior vascular compromise.
- Case 2: Tabes Dorsalis and Proprioceptive Dissociation: A 55-year-old individual presenting with neurosyphilis exhibits severe degeneration of the dorsal roots and posterior funiculi. While the patient displays severe sensory ataxia, negative vibratory sense, and complete absence of two-point discrimination, the patient still readily perceives light, sweeping touch and gentle pressure applied to the lower extremities. This preserved sensation illustrates the operational integrity of the anterior spinothalamic tract, which safely routes crude touch through the intact anterior funiculus, bypassing the devastated dorsal column pathway.
- Case 3: Syringomyelia with Commissural Disruption: A 34-year-old patient develops a central fluid-filled cavitation (syrinx) within the cervical cord. As the cavity expands, it destroys the anterior white commissure while sparing the peripheral white columns. This produces a “cape-like” suspended bilateral loss of pain and temperature sensation, accompanied by a subtle, patchy reduction in non-discriminative light touch across the shoulders and arms, caused by the localized interruption of decussating second-order spinothalamic axons before they can enter the anterior funiculi.
9. Measurement & Assessment
Assessing the functional status of the anterior spinothalamic tract requires specialized clinical maneuvers aimed at isolating crude tactile perception from discriminative, dorsal-column-mediated touch:
Clinical bedside assessment is conducted using a wisp of cotton, a light camel-hair brush, or a gentle manual touch. The examiner applies the stimulus across alternating dermatomes, instructing the patient to close their eyes and state “yes” or “touch” immediately upon perceiving contact. To reduce the confounding influence of the intact dorsal columns, examiners employ “directional touch” or dynamic light stroking across hairy skin, which predominantly excites low-threshold unmyelinated C-tactile afferents and hair follicle receptors known to channel robustly into the anterior spinothalamic system.
Quantitative sensory testing (QST) utilizes standardized von Frey monofilaments to establish absolute mechanical detection thresholds. Monofilaments ranging from 0.008 to 300 grams apply repeatable, calibrated forces to the epidermal surface, enabling clinicians to establish subtle sensory deficits. While elevated thresholds to static monofilament application may signify dorsal column pathology, loss of diffuse dynamic tactile awareness strongly implicates disruption within the anterolateral system.
Electrophysiological evaluations include somatosensory evoked potentials (SEPs). Standard electrical stimulation of large-diameter peripheral nerve trunks primarily generates cortical potentials (e.g., N20 or P37) via fast-conducting dorsal column fibers. However, specialized CO2 laser-evoked potentials (LEP) or contact heat evoked potentials (CHEP), combined with microneurography, permit clinicians to analyze conduction velocity, latency, and amplitude within the spinothalamic ascending system, helping differentiate radicular compression from intrinsic spinal cord parenchymal damage.
10. Applications & Practical Significance
The anatomical course of the anterior spinothalamic tract carries broad significance across multiple clinical specialties:
In neurosurgery, the tract represents a crucial boundary marker during invasive spinal interventions. Surgeons performing percutaneous cordotomy for chronic cancer pain insert an electrode into the anterolateral quadrant of the spinal cord to lesion the lateral spinothalamic tract. Accurate electrophysiological stimulation mapping is crucial: if the electrode drifts too far ventrally toward the anterior spinothalamic tract or the anterior horn, the patient reports sensations of vague tactile vibration or exhibits rhythmic motor twitches in anterior horn motor neuron pools, indicating the need to reposition the probe.
In diagnostic neurology, understanding the decussation dynamics of the anterior spinothalamic tract provides high localizing value. Because fibers traverse one to two spinal levels obliquely within the anterior white commissure before ascending, focal spinal cord lesions (such as contusions, extrinsic tumors, or transverse myelitis) typically yield a contralateral sensory deficit whose upper border begins one to two segments below the anatomical level of the lesion.
In physical rehabilitation and occupational therapy, therapists leverage the redundant nature of touch pathways to rehabilitate individuals recovering from spinal cord injuries or Brown-Séquard syndrome. Therapeutic strategies use multimodal sensory re-education—combining deep pressure, dynamic brush stroking, and thermal-tactile cues—to drive neuroplastic reorganization in secondary somatosensory cortices by optimizing transmission along surviving anterior spinothalamic projections when the dorsal columns are irreparably damaged.
11. Research & Empirical Evidence
Contemporary neuroscience research has revised classic conceptions of the spinothalamic tracts through advanced neurotracing, optogenetics, and functional neuroimaging. Seminal animal tract-tracing studies by William D. Willis and colleagues demonstrated that spinothalamic neurons are not homogenous conduits, but rather display functional diversification: spinothalamic cells within deep dorsal laminae (Lamina V) receive convergent inputs from both low-threshold mechanoreceptors and high-threshold nociceptors, acting as “wide dynamic range” (WDR) units capable of encoding stimulus intensity across a vast spectrum from faint touch to tissue injury.
Human neuroimaging investigations utilizing ultra-high-field functional magnetic resonance imaging (fMRI) have shed light on the higher-order termination of the anterior spinothalamic system. Studies led by A.D. (Bud) Craig and colleagues have revealed that spinothalamic pathways do not terminate solely within the primary somatosensory cortex (S1); rather, they project densely to the posterior insular cortex and anterior cingulate cortex. This pathway subserves “affective touch”—pleasant, low-velocity tactile stimulation mediated by C-tactile afferents—providing an empirical neuroanatomical basis for how light touch influences emotional bonding, limbic processing, and homeostatic regulation.
Modern diffusion tensor imaging (DTI) and tractography have also mapped the three-dimensional reconstruction of the spinal lemniscus in living human subjects. Investigations by researchers such as Wheeler-Kingshott and colleagues have yielded quantifiable indices of fractional anisotropy (FA) within the anterior spinal white matter, enabling researchers to correlate microstructural disorganization of the anterior spinothalamic tract with specific post-traumatic central pain syndromes and sensory dissociation phenomena seen in multiple sclerosis.
12. Cultural & Cross-Cultural Considerations
Although the neuroanatomical structure of the anterior spinothalamic tract is biologically invariant across human populations, the subjective experience, affective valuation, and clinical reporting of the sensations it carries are mediated by cultural and sociological factors. The anterior spinothalamic tract plays a fundamental role in mediating the pleasant, soothing qualities of dynamic light touch, which underpins non-verbal interpersonal communication.
Sociological studies demonstrate significant cross-cultural variability regarding social touch tolerance and touch frequencies. In “high-contact” cultures (such as Mediterranean, Latin American, and Middle Eastern societies), frequent physical contact and communicative touching are embedded within routine social interactions, reinforcing neurochemical oxytocin release triggered by low-threshold cutaneous stimulation. Conversely, in “low-contact” societies (such as certain Northern European or East Asian contexts), unsolicited light touch may elicit distinct stress responses or social discomfort, altering the affective interpretation of spinothalamic signaling within insular and orbitofrontal cortical projections.
In cross-cultural clinical settings, sensory complaints related to spinothalamic dysfunction are frequently expressed through culturally shaped idioms of distress. In several non-Western medical contexts, paresthesias and dysesthesias carried by spinothalamic channels are characterized as somatic experiences of “heat,” “crawling ants,” or disruptions in subtle energy flow (such as *qi* or *prana*), requiring clinicians to distinguish between physiological lesions of the anterior white commissure and culturally framed psychosomatic symptom expressions.
13. Criticisms, Debates & Limitations
Modern neuroanatomy continues to debate several theoretical and structural aspects of the anterior spinothalamic tract:
- The Validity of Anatomical Independence: A major academic controversy centers on whether the anterior spinothalamic tract truly exists as a distinct anatomical entity or whether it merely represents an arbitrary ventral boundary of a singular, continuous spinothalamic tract. Contemporary neurohistological evidence demonstrates that spinothalamic fibers form a dispersed, continuous matrix throughout the entire anterolateral funiculus. Consequently, many modern neuroanatomists advocate abandoning the rigid division between “anterior” and “lateral” spinothalamic tracts, preferring the unifying term “anterolateral system” (ALS) to reflect this functional and topographical continuum.
- Redundancy vs. Specialization of Light Touch: Classic neuroanatomy textbooks teach that light touch is conveyed redundantly by both the anterior spinothalamic tract and the dorsal column-medial lemniscal system. However, neurophysiologists continue to debate the evolutionary necessity and precise informational divergence between these two channels. While the dorsal columns excel in high-frequency vibratory transmission and spatial two-point discrimination, the anterior spinothalamic tract conveys broad, affective, and low-resolution tactile data. Skeptics note that clinical isolation of pure anterior spinothalamic deficits remains nearly impossible without concomitant involvement of neighboring motor or autonomic tracts, leaving open questions regarding its standalone contribution to tactile perception.
- Pathways for C-Tactile Afferents: A third debate surrounds the exact spinal routing of pleasant, affective touch mediated by C-tactile fibers. While substantial evidence points toward ascension within the anterior spinothalamic tract to the insula, competing studies suggest that a proportion of these unmyelinated tactile signals may ascend through postsynaptic dorsal column pathways or spinocervical networks, challenging simplistic models of spinal cord sensory processing.
14. Related Terms & Distinctions
To ensure clinical accuracy and avoid anatomical confusion, the anterior spinothalamic tract must be carefully differentiated from neighboring tracts and functional counterparts:
- Lateral Spinothalamic Tract: Located dorsolaterally within the lateral funiculus, this companion tract conveys primary nociceptive (pain) and thermal (cold and warmth) sensations, whereas the anterior tract mediates non-discriminative crude touch and light pressure.
- Dorsal Column-Medial Lemniscal System: Comprising the fasciculus gracilis and fasciculus cuneatus, this homolateral ascending pathway specializes in epicritic sensations, including fine discriminative touch, vibratory sense, two-point discrimination, and conscious proprioception, contrasting sharply with the protopathic crude touch of the anterior spinothalamic tract.
- Anterior Corticospinal Tract: A descending motor pathway occupying a medial position within the anterior funiculus; it originates from pyramidal cells in the cerebral cortex and regulates axial and proximal limb musculature, in contrast to the ascending, sensory nature of the spinothalamic tract.
- Spinoreticular Tract: Ascends in close proximity within the anterolateral funiculus but terminates within the medullary and pontine reticular formation, modulating behavioral arousal, motor reflexes, and emotional responses to pain rather than direct conscious tactile awareness.
- Spinocerebellar Tracts (Anterior and Posterior): Ascending sensory tracts positioned along the lateral margins of the cord that convey unconscious proprioceptive input directly to the cerebellar cortex to orchestrate ongoing motor coordination, possessing no conscious sensory perception capabilities.
15. Summary / Key Takeaways
The anterior spinothalamic tract serves as a fundamental ascending channel mediating non-discriminative crude touch and light surface pressure within the human central nervous system. Originating from second-order projection neurons in the dorsal horn (predominantly Rexed laminae IV–V), its axons decussate across the anterior white commissure over one to two spinal levels before ascending through the contralateral anterior funiculus. Traversing the brainstem as an integral part of the spinal lemniscus, the tract terminates within the ventroposterolateral (VPL) nucleus of the thalamus, which in turn projects directly to the postcentral gyrus.
Functioning in parallel with the dorsal column-medial lemniscal system, the anterior spinothalamic tract provides vital sensory redundancy, ensuring that crude awareness of environmental contact remains intact even in the face of selective posterior cord injuries. Its somatotopic architecture, distinct blood supply, and functional integration with affective touch networks underscore its clinical importance in diagnosing spinal cord infarctions, compressive myelopathies, and syringomyelia, firmly establishing the anterior spinothalamic tract as an essential subject within neuroanatomy and clinical neurology.
In summary, the anterior spinothalamic tract illustrates the elegant specialization of the human somatosensory system, combining ancient protopathic contact surveillance with high-level cortical arousal networks. A clear grasp of its structural trajectory, physiological decussation, and diagnostic presentation remains indispensable for all neuroscientists, clinicians, and medical professionals operating within the neurosciences.
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