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Publication date: Available online 17 October 2018
Source: International Journal of Psychophysiology
Author(s): Jamie N. Hershaw, Mark L. Ettenhofer
Despite increasing use of pupillometry to understand cognitive deficits in clinical populations, there is no consensus on what pupillary metrics are most useful. In this study, we compare the reliability, sensitivity to mild traumatic brain injury (TBI) and cognitive load differences, and the likelihood of replication between various pupillary metrics. Raw pupil diameter was recorded from 15 patients with chronic mild TBI and 23 uninjured controls while they performed a cognitive task with three levels of cognitive load. Several pupillary metrics were quantified from the pupillary data and submitted to tests of internal consistency, group ∗ cognitive load repeated measures ANOVAs, and bootstrapping analyses of effect size. Most pupillary metrics demonstrated acceptable, good, or excellent reliability. Metrics differed in sensitivity to group, cognitive load, and their interaction. Bootstrapping analyses revealed that peak-based metrics are more likely to replicate than means- or ratio-based metrics. Several pupillary metrics were determined to have great utility for measuring cognitive load in clinical or normative samples. This study directly addresses a known methodological gap in the cognitive pupillometry literature.
Publication date: Available online 17 October 2018
Source: International Journal of Psychophysiology
Author(s): Antonio Arjona, Elena Rodríguez, Manuel Morales, Carlos M. Gómez
Global and local probability effects were explored in a visuo-auditory version of the central cue Posner's paradigm through the analysis of the neural Event-Related Potentials (ERPs) generated in the interaction between validity sequence effects (local probability) and block validity effects (global probability). Four behavioral measures (response times, correct/incorrect anticipations, and incorrect responses), three pre-target ERPs (visual P1/N1 and Contingent Negative Variation (CNV)), and six post-target ERPs (auditory N1, P2, Processing Negativity (PN), P3a, P3b and Late Slow Positivity (LSP)) were considered. Four types of trial-sequences (Valid-Valid, Invalid-Valid, Invalid-Invalid, Valid-Invalid) and three types of trial-blocks, with different validity/invalidity proportions (50%, 68%, and 86% of valid trials), were employed. Present data replicate previous reports on the validity sequence effects on ERPs (local probability): (i) higher CNV on trials preceded by valid trials; (ii) higher PN on valid trials preceded by invalid trials compared to valid trials preceded by valid trials; and (iii) higher P3a/P3b and LSP on invalid trials preceded by valid trials compared to invalid trials preceded by invalid trials. In summary, local probability showed more effects modulating the brain responses than global probability and/or their interaction. Among a number of other hypotheses, the functional systems theory would account for the ability of the previous trial to modify processing in the current trial.
Although 40% of adolescent idiopathic scoliosis (AIS) patients present with chronic back pain, the pathophysiology and underlying pain mechanisms remain poorly understood. We hypothesized that development of chronic pain syndrome in AIS is associated with alterations in pain modulatory mechanisms.
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Quantitative computed tomography (QCT) of the lumbar spine is used as an alternative to dual-energy X-ray absorptiometry in assessing bone mineral density (BMD). The average BMD of L1-L2 is the standard reportable metric used for diagnostic purposes according to current recommendations. The density of L1 and L2 has also been proposed as a reference value for the remaining lumbosacral vertebrae and is commonly used as a surrogate marker for overall bone health. Since regional BMD differences within the spine have been proposed, it is unclear if the L1-L2 average correlates with the remainder of the lumbosacral spine.
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Visit us at EMS World Expo Booth #934 to see our life saving innovations! PerSys Medical will be exhibiting at EMS World. PerSys Medical develops and brings to market life-saving innovations for vascular access, hemorrhage control, hypothermia prevention and airway management. We provide emergency medical solutions for military and civilian markets, such as EMS, law enforcement, hospital and...
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Using LEAD principles, EMS leaders can encourage employee retention at their organizations
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Dr. Sara Gilman discusses the importance of an Employee Assistance Program that is tailored to the needs of first responders and their unique experience serving the public
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Asian Journal of Endoscopic Surgery, Volume 11, Issue 4, Page 285-290, November 2018.
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The Journal of Physiology, Volume 0, Issue ja, -Not available-.
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The Journal of Physiology, Volume 0, Issue ja, -Not available-.
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Psychophysiology, Volume 55, Issue 11, November 2018.
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Publication date: Available online 17 October 2018
Source: Mutation Research/Reviews in Mutation Research
Author(s): Zhi Dong Zhou, Ji Chao Tristan Lee, Eng King Tan
Mutations of F-box only protein 7 (FBXO7) gene are associated with a severe form of autosomal recessive juvenile Parkinson's disease (PD) (PARK15) with clinical features of Parkinsonian-Pyramidal syndrome (PPS). FBXO7 is an adaptor protein in SCFFBXO7 ubiquitin E3 ligase complex that recognizes and mediates degradative or non-degradative ubiquitination of substrates. The FBXO7 protein can regulate cell cycle, proliferation, mitochondrial and proteasome functions via interactions with multiple target proteins. Five PARK15-linked FBXO7 gene mutations and several PD-associated single nucleotide polymorphisms (SNP) have been identified so far. WT FBXO7 proteins possess dual protective and deleterious functions, whereas PARK15-linked FBXO7 mutants are toxic. FBXO7 is a stress response protein and stress challenges can promote translocation of FBXO7 protein from nucleus into mitochondria and even form deleterious protein aggregate in mitochondria. FBXO7 mutants aggravate protein aggregation in mitochondria and inhibit mitophagy. The pathological mechanisms concerning FBXO7-relevant protein aggregation, mitochondria impairment, reactive oxygen species (ROS) generation and mitophagy modulation in PARK15 pathogenesis are highlighted and discussed in the current review.
Publication date: November 2018
Source: Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms, Volume 1861, Issue 11
Author(s):
Publication date: Available online 17 October 2018
Source: Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms
Author(s): Kate D. Meyer
Publication date: December 2018
Source: Journal of Human Evolution, Volume 125
Author(s): Nathan E. Thompson, Matthew C. O'Neill, Nicholas B. Holowka, Brigitte Demes
Human bipedalism is characterized by mediolateral oscillations of the center of mass (CoM) between the feet. The preferred step widths and CoM oscillations used by humans likely represent a trade-off of several factors (e.g., stance and swing phase costs). However, it is difficult to assess whether human frontal plane control strategies are unique given few detailed data on frontal plane motion during facultative bipedalism in apes. Here, we collected three-dimensional kinematic and kinetic data in humans and chimpanzees to investigate the relationship between step width, mediolateral CoM motion, frontal plane trunk kinematics, and CoM power during bipedalism. Chimpanzee bipedalism entails mediolateral CoM oscillations and step widths that are (scaled to lower/hind limb length) three times larger than those of humans. Chimpanzees use a combination of linear and angular motion of the trunk and list the entire trunk, and especially thorax, over the stance side foot, generating large mediolateral shifts in the CoM, whereas humans utilize little angular motion within the trunk. Larger mediolateral CoM motions do not have a significant effect on CoM power. Similarities between bipedal chimpanzees and other bipedal non-human primates (macaques and gibbons) indicate that narrow CoM motions are unique to humans and are likely due to our adducted hips and valgus knees. Valgus knees appear early in the human fossil record (∼3.6 Ma), contemporaneous with the Laetoli footprints. However, fossils attributed to Ardipithecus ramidus (∼4.4 Ma) suggest that the earliest hominins may have lacked a hominin-like degree of knee valgus. If correct, this suggests that this species may have used wide steps, larger mediolateral CoM motions, and perhaps larger trunk motions during bipedal walking. Finally, we present a novel means to estimate mediolateral CoM motion from trackway step width, and estimate that the Laetoli G track maker used CoM motions within the human range.
Journal of the National Cancer Institute
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Hepatology
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Hepatology
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Asian Journal of Endoscopic Surgery, EarlyView.
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The Journal of Physiology, Volume 0, Issue ja, -Not available-.
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The Journal of Physiology, Volume 0, Issue ja, -Not available-.
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The Journal of Physiology, Volume 0, Issue ja, -Not available-.
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Psychophysiology, EarlyView.
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American Journal of Medical Genetics Part A, EarlyView.
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American Journal of Medical Genetics Part A, EarlyView.
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Experimental Physiology, EarlyView.
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Experimental Physiology, Volume 0, Issue ja, -Not available-.
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Pediatric Anesthesia, EarlyView.
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