Miracle-dz/UniFAR-FTUs huggingface dataset:
Target‐cell‐specific bidirectional synaptic plasticity at hippocampal output synapses

It is commonly accepted that the hippocampus is critically involved in the explicit memory formation of mammals. The subiculum is the principal target of CA1 pyramidal cells and thus serves as the major relay station for the outgoing hippocampal information. Pyramidal cells in the subiculum can be classified according to their firing properties into burst‐spiking and regular‐spiking cells. In the present study we demonstrate that burst‐spiking and regular‐spiking cells show fundamentally different forms of low frequency‐induced synaptic plasticity in rats. In burst‐spiking cells, low‐frequency stimulation (at 0.5–5 Hz) induces frequency‐dependent long‐term depression (LTD) with a maximum at 1 Hz. This LTD is dependent on the activation of NMDAR and masks an mGluR‐dependent long‐term potentiation (LTP). In contrast, in regular‐spiking cells low‐frequency stimulation induces an mGluR‐dependent LTP that masks an NMDAR‐dependent LTD. Both processes depend on postsynaptic Ca2+‐signaling as BAPTA prevents the induction of synaptic plasticity in both cell types. Thus, mGluR‐dependent LTP and NMDAR‐dependent LTD occur simultaneously at CA1‐subiculum synapses and the predominant direction of synaptic plasticity relies on the cell type investigated. Our data indicate a novel mechanism for the sliding‐threshold model of synaptic plasticity, in which induction of LTP and LTD seems to be driven by the relative activation state of NMDAR and mGluR. Our observation that the direction of synaptic plasticity correlates with the discharge properties of the postsynaptic cell reveals a novel and intriguing mechanism of target specificity that may serve in tuning the significance of neuronal information by trafficking hippocampal output onto either subicular burst‐spiking or regular‐spiking cells.
Processing of sound location in human cortex

This functional magnetic resonance imaging study was focused on the neural substrates underlying human auditory space perception. In order to present natural‐like sound locations to the subjects, acoustic stimuli convolved with individual head‐related transfer functions were used. Activation foci, as revealed by analyses of contrasts and interactions between sound locations, formed a complex network, including anterior and posterior regions of temporal lobe, posterior parietal cortex, dorsolateral prefrontal cortex and inferior frontal cortex. The distinct topography of this network was the result of different patterns of activation and deactivation, depending on sound location, in the respective voxels. These patterns suggested different levels of complexity in processing of auditory spatial information, starting with simple left/right discrimination in the regions surrounding the primary auditory cortex, while the integration of information on hemispace and eccentricity of sound may take place at later stages. Activations were identified as being located in regions assigned to both the dorsal and ventral auditory cortical streams, that are assumed to be preferably concerned with analysis of spatial and non‐spatial sound features, respectively. The finding of activations also in the ventral stream could, on the one hand, reflect the well‐known functional duality of auditory spectral analysis, that is, the concurrent extraction of information based on location (due to the spectrotemporal distortions caused by head and pinnae) and spectral characteristics of a sound source. On the other hand, this result may suggest the existence of shared neural networks, performing analyses of auditory ‘higher‐order’ cues for both localization and identification of sound sources.
Sexually dimorphic activation of the periaqueductal gray–rostral ventromedial medullary circuit during the development of tolerance to morphine in the rat

The midbrain periaqueductal gray (PAG) and its descending projections to the rostral ventromedial medulla (RVM) provides an essential neural circuit for the antinociceptive effects of opiates, and has been implicated in the development of tolerance to morphine. Systemic morphine activates a greater proportion of PAG–RVM neurons in male vs female rats, and induces tolerance to a greater degree in males. The present studies tested the hypothesis that if the PAG–RVM pathway is essential for the development of tolerance, then: (i) morphine activation of the PAG–RVM pathway should decline as tolerance develops; and (ii) sex differences in the development of tolerance to morphine should be reflected as a greater decline in the activation of this pathway in males. These hypotheses were tested in male and female rats using behavioral testing (hot‐plate) and immunohistochemistry to map the activation of the PAG–RVM pathway following repeated morphine administration (5 mg/kg; s.c.). In males, morphine potency decreased from 3.0 to 6.3 mg/kg, indicating tolerance, and this was paralleled by a steady decline in the percentage of PAG–RVM output neurons activated by morphine. In contrast, in females the shift in morphine potency was significantly attenuated (D50 6–8.3 mg/kg), and no significant difference in the activity of PAG–RVM output neurons was noted. These results demonstrate that the greater development of tolerance to morphine administration in male rats corresponds with a significant reduction in the activation of the PAG–RVM circuit and suggest a central role for the PAG in the development of tolerance to morphine.
Predictors of Early Mortality After Traumatic Spinal Cord Injury: A Population-Based Study

Study Design. Retrospective cohort study. Objective. To identify predictors of early mortality following traumatic spinal cord injury (TSCI). Summary of Background Data. Limited information is available on factors associated with early mortality following TSCI. Ability to identify high risk individuals can help to appropriately treat them, and reduce mortality. Methods. Early mortality was defined as death occurring during the initial hospital admission. Retrospective analysis of 1995 patients with TSCI, admitted to various hospitals of South Carolina from 1993 to 2003, was performed. There were 251 patients with early mortality. Multivariable logistic regression was used in modeling of early death following TSCI with gender, race, age, Frankel grade, trauma center, level of injury, injury severity score (ISS), traumatic brain injury (TBI), and medical comorbidities as covariates. Results. Increasing age after 20 years (OR: 1.2, P = <0.0001), male gender (OR: 1.6, P = 0.016), severe (ISS ≥15) systemic injuries (OR: 1.9, P = 0.012), TBI (OR: 3.7, P < 0.0001), 1 or more comorbidities (P < 0.0001), poor neurologic status (P = 0.015), and level 1 trauma center (OR: 1.4, P = 0.026) were significantly associated with early mortality, after adjusting for other covariates. Conclusion. Early mortality following TSCI is influenced by multiple factors. Timely recognition of these factors is crucial for improving survival in the acute care setting. Severe systemic injuries, medical comorbidities, and TBI continue to be the main limiting factors affecting the outcome. These findings also suggest the need to allocate resources for trauma prevention, and promote research towards improving the care of acutely injured patients.
Backstroke start kinematic and kinetic changes due to different feet positioning

Abstract The backstroke swimming start international rules changed in 2005. This study compared two backstroke start variants, both with feet parallel to each other but in complete immersion and emersion. Six elite swimmers performed two sets of 4 maximal 15 m bouts, each set using one of the variants. The starts were videotaped in the sagittal plane with two cameras, providing bi-dimensional dual-media kinematic evaluation, and an underwater force plate and a handgrip instrumented with a load cell collected kinetic data. Backstroke start with feet immerged displayed greater centre-of-mass horizontal starting position, centre-of-mass horizontal velocity at hands-off and take-off angle. Backstroke start with feet emerged showed greater wall contact time, centre-of-mass horizontal and downward vertical velocity at take-off, lower limbs horizontal impulse, and centre-of-mass downward vertical velocity during flight phase. Backstroke start with feet immerged and emerged displayed similar centre-of-mass horizontal water reach, back arc angle and 5 m starting time. Irrespective of the swimmer’s feet positioning, coaches should emphasise each variant’s mechanical advantages during the wall contact phases. Furthermore, the maintenance of those advantages throughout the flight should be stressed for better backstroke start performance.
Systematic review of single‐incision laparoscopic colonic surgery

Randomized clinical trials (RCTs) have shown multiport laparoscopic surgery to be safe compared with open surgery in elective colonic disease. Single‐incision laparoscopic surgery (SILS) represents the latest advance in laparoscopic surgery. The aim of this systematic review was to establish the safety and complication profile of colonic SILS.
Anisotropy in the representation of direction preferences in cat area 18

Higher visual cortical areas are involved in the perception of complex stimuli, such as the optic flow created by self‐motion. On the other hand, area 18 is thought to extract primitive visual features, feeding higher cortical areas for further processing. In this study, we applied optical imaging of intrinsic signals in the central, lower visual field of cat area 18, and reconstructed direction preference and direction selectivity maps in each hemisphere. We observed a significant overrepresentation of downward and temporal directions, in accordance with previous electrophysiological results. Cardinal orientations were not overrepresented, however. Downward directions were overrepresented at the highest direction selectivity domains. Temporal direction representation, on the other hand, decreased with direction selectivity. Our findings therefore suggest the existence of a neural substrate for the processing of optic flow in cat area 18.
Seasonal variation in physical activity and sedentary time in different European regions. The HELENA study

Abstract This report aims (1) to examine the association between seasonality and physical activity (PA) and sedentary time in European adolescents and (2) to investigate whether this association was influenced by geographical location (Central-North versus South of Europe), which implies more or less extreme weather and daylight hours. Valid data on PA, sedentary time and seasonality were obtained in 2173 adolescents (1175 females; 12.5–17.5 years) included in this study. Physical activity and sedentary time were measured by accelerometers. ANCOVA was conducted to analyse the differences in PA and sedentary time across seasons. Results showed that girls had lower levels of moderate to vigorous PA (MVPA) and average PA, and spent more time in sedentary activities in winter compared with spring (all P < 0.05). Stratified analyses showed differences in PA and sedentary time between winter and spring in European girls from Central-North of Europe (P < 0.05 for sedentary time). There were no differences between PA and sedentary time across seasonality in boys. In conclusion, winter is related with less time spent in MVPA, lower average PA and higher time spent in sedentary activities in European adolescent girls, compared with spring. These differences seem to mainly occur in Central-North Europe.
The NCAM‐derived P2 peptide facilitates recovery of cognitive and motor function and ameliorates neuropathology following traumatic brain injury

The neural cell adhesion molecule (NCAM) plays a crucial role during development and regeneration of the nervous system, mediating neuronal differentiation, survival and plasticity. Moreover, NCAM regulates learning and memory. A peptide termed P2, corresponding to a 12‐amino‐acid sequence in the second immunoglobulin (Ig)‐like module of NCAM, represents the natural cis‐binding site for the first NCAM Ig module. The P2 peptide targets NCAM, thereby inducing a number of intracellular signaling events leading to the stimulation of neurite outgrowth and promotion of neuronal survival in vitro. The present study evaluated the effect of the P2 peptide on functional and histological outcomes following traumatic brain injury inflicted by a cortical cryogenic lesion. Lesioned rats were injected subcutaneously with P2 peptide, 5 mg/kg daily for 15 days beginning 2 h after injury. This treatment significantly improved postlesion recovery of motor and cognitive function, reduced neuronal degeneration, protected cells against oxidative stress, and increased reactive astrogliosis and neuronal plasticity in the sublesional area. P2 appeared rapidly in blood and cerebrospinal fluid after subcutaneous administration and remained detectable in blood for up to 5 h. The results suggest that P2 has therapeutic potential for the treatment of traumatic brain injury.
GABAergic mechanism mediated via D1 receptors in the rat periaqueductal gray participates in the micturition reflex: an in vivo microdialysis study

The periaqueductal gray (PAG) is critically involved in the micturition reflex, but little is known about the neuronal mechanisms involved. The present study elucidated dynamic changes in dopamine (DA), glutamate and γ‐aminobutyric acid (GABA) in the rat PAG during the micturition reflex, with a focus on dopaminergic modulation using in vivo microdialysis combined with cystometrography. Extracellular levels of DA and glutamate increased, whereas levels of GABA decreased, in parallel with the micturition reflex. Application of a D1 receptor antagonist into the PAG produced increases in maximal voiding pressure (MVP) and decreases in intercontraction interval (ICI), suggesting that the micturition reflex was facilitated by D1 receptor blockade. The D1 receptor antagonist prevented micturition‐induced decreases in GABA efflux but had no effect on DA or glutamate. Neither a D2 receptor antagonist nor a D1/D2 receptor agonist affected these neurochemical and physiological parameters. Micturition‐induced inhibition of GABA was not observed in 6‐hydroxydopamine (6‐OHDA)‐lesioned rats, an animal model of Parkinson’s disease. 6‐OHDA‐lesioned rats exhibited bladder hyperactivity evaluated by increases in MVP and decreases in ICI, mimicking facilitation of the micturition reflex induced by D1 receptor blockade. These findings suggest that the micturition reflex is under tonic dopaminergic regulation through D1 receptors, in which a GABAergic mechanism is involved. Bladder hyperactivity observed in 6‐OHDA‐lesioned rats may be caused by dysfunction of GABAergic regulation underlying the micturition reflex. The present findings contribute to our understanding not only of the neurophysiology of the micturition reflex but also of the pathophysiology of lower urinary tract dysfunction in patients with Parkinson’s disease.
Facilitating undergraduate interprofessional learning in healthcare: comparing classroom and clinical learning for nursing and medical students

There has been increasing emphasis on the important role that interprofessional education (IPE) must play in educating and developing present and future healthcare professionals. However, clarity is urgently needed regarding appropriate strategies for its timing, content, delivery and assessment. This study focuses on the development of an undergraduate IPE programme for medical and nursing students. It compares learning opportunities in classroom and clinical areas and identifies suitable pedagogical strategies and subject areas. The programme consisted of 2 weeks of classroom-based learning for all 130 participating students, followed by 6 weeks on shared placement for 35 of the 113 medical and all 17 nursing students. A triangulation of data-collection methods was used to help strengthen reliability and validity and provide a more comprehensive analysis. In both classroom and clinical areas, successful methods of delivery for IPE were those that enabled exchanges of perspectives. Ward-based IPE was regarded as particularly effective in encouraging students to begin to feel part of a clinical team. In contrast, classroom-based learning enabled them to know about teamwork, but not to experience it. Practical issues of shift and timetable incompatibility were the most significant barriers to successful placement-shared learning. Developments in this area will need to focus on those elements of clinical practice which bring students together for collaborative involvement in activities that maximize the benefits resulting from the investment of time and effort involved. We conclude that undergraduate IPE opportunities have an important role to play in enabling students to learn about the roles and responsibilities of others and the impact of this on their own practice. It should be the first step towards developing practitioners who, whilst retaining their own unique professional identity, are able to understand and respect the roles of other healthcare professionals and work collaboratively to improve patient care.
Change in Modic Type 1 and 2 Signals After Posterolateral Fusion Surgery

Study Design. Prospective cohort study. Objective. To examine the change of Modic Type 1 to Type 2 after posterolateral fusion surgery. Summary of Background Data. Lumbar vertebral bone marrow change is divided into Modic types. Magnetic resonance imaging reveals Modic Type 1 and 2 signals. Some reports indicate that with time, Type 1 signals (intervertebral instability) change to Type 2 (restabilization), but the reliability of this assertion is unclear. The current study examines the change of Modic Type 1 signals to Type 2 after posterolateral fusion surgery. Methods. Patients with Modic Type 1 and 2 signals were selected (mean age, 65 years). All patients suffered low back pain and leg pain due to lumbar spinal canal stenosis, and underwent decompression and posterolateral fusion surgery. We evaluated change in Modic signal and severity of low back pain (Visual analogue scale score, Japanese Orthopedic Association score, and Oswestry Disability Index before and 24 months after surgery. Results. Of 21 patients with Modic Type 1 signals before surgery, 2 cases changed to normal bone marrow, 9 to Type 2, and 12 remained Type 1. Of 12 patients with Type 2 signals, none changed to Type 1, 2 changed to normal bone marrow, and 10 remained Type 2. Visual analogue scale score, Japanese Orthopedic Association score, and Oswestry Disability Index improved after surgery; however, low back pain was not significantly associated with signal change after surgery (P > 0.05). Conclusion. In the current study, Modic Type 1 signals changed to Type 2; however, Type 2 did not change to Type 1, suggesting that Type 2 signals indicate a stabilized stage. For Modic Type 1 and 2 signals, there were changes to normal bone marrow signals in 4 cases. Therefore, degenerated bone marrow may be able to regenerate after surgical stabilization. We did not show a significant difference between low back pain and signal type.
Sleep‐wakefulness effects after microinjections of hypocretin 1 (orexin A) in cholinoceptive areas of the cat oral pontine tegmentum

Hypocretinergic/orexinergic neurons, which are known to be implicated in narcolepsy, project to the pontine tegmentum areas involved in the control of rapid eye movement (REM) sleep. Here, we report the effects on sleep‐wakefulness produced by low‐volume microinjections of hypocretin (Hcrt)1 (20–30 nL, 100, 500 and 1000 μm) and carbachol (20–30 nL, 0.1 m) delivered in two areas of the oral pontine tegmentum of free‐moving cats with electrodes for chronic sleep recordings: in the dorsal oral pontine tegmentum (DOPT) and in the ventral part of the oral pontine reticular nucleus (vRPO). Carbachol in the DOPT produced dissociate polygraphic states, with some but not all REM sleep signs. In contrast, carbachol in the vRPO produced a shift with short latency from wakefulness (W) to REM sleep with all of its polygraphic and behavioral signs. Hcrt‐1 in the DOPT increased W and decreased both slow‐wave sleep (SWS) and REM sleep during the first 3 h post‐drug. The same doses of Hcr‐1 in the vRPO produced a significant suppression of REM sleep without a definitive trend for changes in the other states. Both groups showed significant decreases in the number of transitions from SWS to REM sleep. Thus, Hcrt‐1 produced distinct effects in cholinoceptive areas of the oral pontine tegmentum; in the DOPT it promoted W, suppressed SWS and probably defacilitated REM sleep, and in the vRPO it directly inhibited REM sleep. Hypocretinergic/orexinergic signaling is lost in narcoleptics and this absence would mean that pontine defacilitation/inhibition of REM sleep would also be absent, explaining why these patients can fall directly into REM sleep from W.
More of the same? Comment on “An integrated framework for the optimisation of sport and athlete development: A practitioner approach”

Abstract Gulbin and colleagues (Gulbin, J. P., Croser, M. J., Morley, E. J., & Weissensteiner, J. R. (2013). An integrated framework for the optimisation of sport and athlete development: A practitioner approach. Journal of Sports Sciences) present a new sport and athlete development framework that evolved from empirical observations from working with the Australian Institute of Sport. The FTEM (Foundations, Talent, Elite, Mastery) framework is proposed to integrate general and specialised phases of development for participants within the active lifestyle, sport participation and sport excellence pathways. A number of issues concerning the FTEM framework are presented. We also propose the need to move beyond prescriptive models of talent identification and development towards a consideration of features of best practice and process markers of development together with robust guidelines about the implementation of these in applied practice.
Suppression of visual cortical evoked responses following deprivation of pattern vision in adult mice

The effect of visual loss on the adult neocortex can have significant impact on the success of a visual implant. Recent research has shown that the adult neocortex retains substantial plasticity following a disruption to its afferent input. The result of these changes may hamper the development of a visual prosthesis if visual sensation cannot be effectively restored by stimulation of the surviving elements of the visual pathway. In order to evaluate further the visual performance of the mammalian adult brain following visual loss, especially the dominant form of blindness in humans, namely loss of pattern vision, we examined the cortical evoked potential of adult mice following 7, 30 and 120 days of visual deprivation via bilateral eyelid suture. Cortical potentials were elicited with a flash visual stimulus or by electrical stimulation of the retina. We found that after 7 days deprivation there was a potentiation of the evoked response while at 30 and 120 days deprivation the visual evoked responses were significantly reduced. Increasing the visual stimulus intensity reduced the effects. The electrical evoked potential demonstrated a corresponding reduction in stimulus threshold at 7 days and a corresponding rise (40–50%) after 30 and 120 days. These findings suggest that the adult brain exhibited significant experience‐dependent modifications following visual loss, and the impact depended on the duration of deprivation. Such reduction in visual responsiveness, especially with electrical activation, will need to be taken into account in the development of a visual implant.