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https://www.readbyqxmd.com/read/28937343/effaced-enigmata
#1
Grant Gillett
Severe head injury or brain injury presents clinical neuroscientists with a unique challenge. Based on an objective assessment of cognitive and neurological function, it is sometimes hard to recognize our patients as members of our moral community (actually or potentially) but we treat them as if that were is the case, and, therefore, as if they need rescuing. Thus their existences as enigmata-beings who may or may not reveal themselves to us through social and personal function realized in conversations and relationships-are in doubt...
October 2017: Cambridge Quarterly of Healthcare Ethics: CQ: the International Journal of Healthcare Ethics Committees
https://www.readbyqxmd.com/read/28924628/a-recurrent-neural-model-for-proto-object-based-contour-integration-and-figure-ground-segregation
#2
Brian Hu, Ernst Niebur
Visual processing of objects makes use of both feedforward and feedback streams of information. However, the nature of feedback signals is largely unknown, as is the identity of the neuronal populations in lower visual areas that receive them. Here, we develop a recurrent neural model to address these questions in the context of contour integration and figure-ground segregation. A key feature of our model is the use of grouping neurons whose activity represents tentative objects ("proto-objects") based on the integration of local feature information...
September 19, 2017: Journal of Computational Neuroscience
https://www.readbyqxmd.com/read/28914733/metabolic-connectivity-methods-and-applications
#3
Igor Yakushev, Alexander Drzezga, Christian Habeck
PURPOSE OF REVIEW: Metabolic connectivity modelling aims to detect functionally interacting brain regions based on PET recordings with the glucose analogue [F]fluorodeoxyglucose (FDG). Here, we outline the most popular metabolic connectivity methods and summarize recent applications in clinical and basic neuroscience. RECENT FINDINGS: Metabolic connectivity is modelled by various methods including a seed correlation, sparse inverse covariance estimation, independent component analysis and graph theory...
September 13, 2017: Current Opinion in Neurology
https://www.readbyqxmd.com/read/28914603/synaptic-up-scaling-preserves-motor-circuit-output-after-chronic-natural-inactivity
#4
Joseph M Santin, Mauricio Vallejo, Lynn K Hartzler
Neural systems use homeostatic plasticity to maintain normal brain functions and to prevent abnormal activity.  Surprisingly, homeostatic mechanisms that regulate circuit output have mainly been demonstrated during artificial and/or pathological perturbations.  Natural, physiological scenarios that activate these stabilizing mechanisms in neural networks of mature animals remain elusive.  To establish the extent to which a naturally inactive circuit engages mechanisms of homeostatic plasticity, we utilized the respiratory motor circuit in bullfrogs that normally remains inactive for several months during the winter...
September 15, 2017: ELife
https://www.readbyqxmd.com/read/28899820/a-facilitating-role-for-the-primary-motor-cortex-in-action-sentence-processing
#5
Melody Courson, Joël Macoir, Pascale Tremblay
The involvement of the motor system in action language comprehension is a hotly debated topic in cognitive neuroscience and psychology. Recent studies suggest that primary motor cortex (M1) response to action language is context-sensitive rather than automatic and necessary. Specifically, semantic polarity (i.e. affirmative/negative valence) appears to modulate the intensity of this response, which is stronger for affirmative action sentences. The aim of our study was to examine further the context sensitivity of M1 response...
January 15, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/28889923/social-risky-decision-making-reveals-gender-differences-in-the-tpj-a-hyperscanning-study-using-functional-near-infrared-spectroscopy
#6
Mingming Zhang, Tao Liu, Matthew Pelowski, Huibin Jia, Dongchuan Yu
Previous neuroscience studies have investigated neural correlates of risky decision-making in a single-brain frame during pseudo social (predominantly non face-to-face) contexts. To fully understand the risky decision-making behavior in more natural social interactions, the present study employed a functional near-infrared spectroscopy (fNIRS) hyperscanning technique to simultaneously measure pairs of participants' fronto-temporal activations in a face-to-face gambling card-game. The intra-brain results revealed that both those who identified as males and as females showed higher activations in their mPFC and in the inferior parts of the frontopolar area, as well as in the tempo-parietal junction (TPJ) in cases involving higher versus lower risk...
September 7, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28887224/the-zebrafish-as-a-promising-tool-for-modeling-human-brain-disorders-a-review-based-upon-an-ibns-symposium
#7
REVIEW
Soaleha Shams, Jason Rihel, Jose G Ortiz, Robert Gerlai
The zebrafish represents an excellent compromise between system complexity and practical simplicity, features that make it useful for modeling and mechanistic analysis of complex brain disorders. Also promising are screens for psychoactive drugs with effects on larval and adult zebrafish behavior. This review, based upon a recent symposium held at the 2016 IBNS Congress, provides different perspectives on how the zebrafish may be utilized to advance research into human central nervous system disorders. It starts with a discussion on an important bottleneck in zebrafish research, measuring the behavior of this species (specifically shoaling), and continues with examples on research on autism spectrum disorder in larval zebrafish, on screening natural products for compounds with psychoactive properties in adult zebrafish, and on the development of a zebrafish model of fetal alcohol spectrum disorders...
September 5, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28822294/does-reconsolidation-occur-in-natural-settings-memory-reconsolidation-and-anxiety-disorders
#8
REVIEW
Rodrigo S Fernández, María E Pedreira, Mariano M Boccia
In normal settings, our brain is able to update its stored representations in content, strength, and/or expectations by the memory reconsolidation process. Thus, a reactivated memory enters in a transient labile state (destabilization) followed by a re-stabilization phase in order to persist (memory reconsolidation). Cognitive neuroscience and its insight into psychiatric problems attributed a close relationship between memory (formation, maintenance, and utilization) and several mental disorders. In this framework, the reconsolidation process could be not only the mechanism for maintenance of some psychopathologies, but also open a novel therapeutic window...
August 10, 2017: Clinical Psychology Review
https://www.readbyqxmd.com/read/28811927/premature-deaths-among-individuals-with-severe-mental-illness-after-discharge-from-long-term-hospitalisation-in-japan-a-naturalistic-observation-during-a-24-year-period
#9
Shinsuke Kondo, Yousuke Kumakura, Akiko Kanehara, Daisuke Nagato, Taro Ueda, Tsuneo Matsuoka, Yukiko Tao, Kiyoto Kasai
BACKGROUND: Premature death in individuals with severe mental illness (SMI) in countries without nationally collected data, including Japan, is structurally underreported. AIMS: To elucidate excess mortality among individuals with SMI in Japan. METHOD: We retrospectively investigated all deaths among users of a non-clinical community-based mental health service provider in suburban Tokyo from 1992 to 2015. RESULTS: During the study period, 45 individuals died among 254 qualified registrants...
July 2017: BJPsych Open
https://www.readbyqxmd.com/read/28800678/new-perspectives-on-the-neurophysiology-of-primate-amygdala-emerging-from-the-study-of-naturalistic-social-behaviors
#10
REVIEW
Katalin M Gothard, Clayton P Mosher, Prisca E Zimmerman, Philip T Putnam, Jeremiah K Morrow, Andrew J Fuglevand
A major challenge of primate neurophysiology, particularly in the domain of social neuroscience, is to adopt more natural behaviors without compromising the ability to relate patterns of neural activity to specific actions or sensory inputs. Traditional approaches have identified neural activity patterns in the amygdala in response to simplified versions of social stimuli such as static images of faces. As a departure from this reduced approach, single images of faces were replaced with arrays of images or videos of conspecifics...
August 11, 2017: Wiley Interdisciplinary Reviews. Cognitive Science
https://www.readbyqxmd.com/read/28797134/looking-beyond-the-intervertebral-disc-the-need-for-behavioral-assays-in-models-of-discogenic-pain
#11
REVIEW
Grace E Mosley, Thomas W Evashwick-Rogler, Alon Lai, James C Iatridis
Orthopedic research into chronic discogenic back pain has commonly focused on aging- and degeneration-related changes in intervertebral disc structure, biomechanics, and biology. However, the primary spine-related reason for physician office visits is pain. The ambiguous nature of the human condition of discogenic low back pain motivates the use of animal models to better understand the pathophysiology. Discogenic back pain models must consider both emergent behavioral changes following pain induction and changes in the nervous system that mediate such behavior...
August 10, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28793239/ghosts-in-machine-learning-for-cognitive-neuroscience-moving-from-data-to-theory
#12
REVIEW
Thomas Carlson, Erin Goddard, David M Kaplan, Colin Klein, J Brendan Ritchie
The application of machine learning methods to neuroimaging data has fundamentally altered the field of cognitive neuroscience. Future progress in understanding brain function using these methods will require addressing a number of key methodological and interpretive challenges. Because these challenges often remain unseen and metaphorically "haunt" our efforts to use these methods to understand the brain, we refer to them as "ghosts". In this paper, we describe three such ghosts, situate them within a more general framework from philosophy of science, and then describe steps to address them...
August 6, 2017: NeuroImage
https://www.readbyqxmd.com/read/28760346/a-defect-in-the-mitochondrial-protein-mpv17-underlies-the-transparent-casper-zebrafish
#13
Gianluca D'Agati, Rosanna Beltre, Anna Sessa, Alexa Burger, Yi Zhou, Christian Mosimann, Richard M White
The casper strain of zebrafish is widely used in studies ranging from cancer to neuroscience. casper offers the advantage of relative transparency throughout adulthood, making it particularly useful for in vivo imaging by epifluorescence, confocal, and light sheet microscopy. casper was developed by selective breeding of two previously described recessive pigment mutants: 1) nacre, which harbors an inactivating mutation of the mitfa gene, rendering the fish devoid of pigmented melanocytes; and 2) roy orbison, a mutant with a so-far unidentified genetic cause that lacks reflective iridophores...
July 28, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28759698/what-is-the-unconscious-and-where-is-it-located-in-the-brain-a-neuropsychoanalytic-perspective
#14
Mark Solms
This is a brief overview of my "neuropsychoanalytic" perspective on the unconscious. It should make clear how much psychoanalysis has to gain from incorporating the findings of neuroscientific disciplines studying the same part of nature-the workings of the human mind. I hope it makes equally clear what useful new perspectives can be cast on current issues in cognitive neuroscience, if they, in turn, incorporate the findings of psychoanalysis.
July 31, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28747403/agmatine-multifunctional-arginine-metabolite-and-magic-bullet-in-clinical-neuroscience
#15
REVIEW
Gregor Laube, Hans-Gert Bernstein
Agmatine, the decarboxylation product of arginine, was largely neglected as an important player in mammalian metabolism until the mid-1990s, when it was re-discovered as an endogenous ligand of imidazoline and α2-adrenergic receptors. Since then, a wide variety of agmatine-mediated effects have been observed, and consequently agmatine has moved from a wallflower existence into the limelight of clinical neuroscience research. Despite this quantum jump in scientific interest, the understanding of the anabolism and catabolism of this amine is still vague...
July 26, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28744722/temporal-encoding-strategies-result-in-boosts-to-final-free-recall-performance-comparable-to-spatial-ones
#16
Nichole Bouffard, Jared Stokes, Hannah J Kramer, Arne D Ekstrom
The method of loci is a highly effective mnemonic that recruits existing salient memory for spatial locations and uses the information as a scaffold for remembering a list of items (Yates, 1966). One possible account for the effectiveness of the spatial method of loci comes from the perspective that it utilizes evolutionarily preserved mechanisms for spatial navigation within the hippocampus (Maguire et al. in Proceedings of the National Academy of Sciences, 97(8), 4398-4403, 2000; O'Keefe & Nadel, 1978; Rodriguez et al...
July 25, 2017: Memory & Cognition
https://www.readbyqxmd.com/read/28741100/training-and-the-attentional-blink-raising-the-ceiling-does-not-remove-the-limits
#17
James T Enns, Paul Kealong, Jennifer G Tichon, Troy A W Visser
The attentional blink (AB) is a widely studied deficit in reporting the second of two sequentially presented targets when they occur within 500 milliseconds. The AB often is interpreted to index a structural limit in sequential visual processing. However, this interpretation is challenged by reports that the deficit can be reduced with several hundred trials of specific training (Braun in Nature, 393(6684), 424-425, 1998; Choi et al. in Proceedings of the National Academy of Sciences, 109(30), 12242-12247, 2012; Taatgen et al...
July 24, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28738152/natural-products-and-their-mimics-as-targets-of-opportunity-for-discovery
#18
Stephen F Martin
Diverse structural types of natural products and their mimics have served as targets of opportunity in our laboratory to inspire the discovery and development of new methods and strategies to assemble polyfunctional and polycyclic molecular architectures. Furthermore, our efforts toward identifying novel compounds having useful biological properties led to the creation of new targets, many of which posed synthetic challenges that required the invention of new methodology. In this Perspective, selected examples of how we have exploited a diverse range of natural products and their mimics to create, explore, and solve a variety of problems in chemistry and biology will be discussed...
September 15, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28734836/criticality-in-the-brain-a-synthesis-of-neurobiology-models-and-cognition
#19
REVIEW
Luca Cocchi, Leonardo L Gollo, Andrew Zalesky, Michael Breakspear
Cognitive function requires the coordination of neural activity across many scales, from neurons and circuits to large-scale networks. As such, it is unlikely that an explanatory framework focused upon any single scale will yield a comprehensive theory of brain activity and cognitive function. Modelling and analysis methods for neuroscience should aim to accommodate multiscale phenomena. Emerging research now suggests that multi-scale processes in the brain arise from so-called critical phenomena that occur very broadly in the natural world...
July 19, 2017: Progress in Neurobiology
https://www.readbyqxmd.com/read/28732515/sexually-divergent-induction-of-microglial-associated-neuroinflammation-with-hippocampal-aging
#20
Colleen A Mangold, Benjamin Wronowski, Mei Du, Dustin R Masser, Niran Hadad, Georgina V Bixler, Robert M Brucklacher, Matthew M Ford, William E Sonntag, Willard M Freeman
BACKGROUND: The necessity of including both males and females in molecular neuroscience research is now well understood. However, there is relatively limited basic biological data on brain sex differences across the lifespan despite the differences in age-related neurological dysfunction and disease between males and females. METHODS: Whole genome gene expression of young (3 months), adult (12 months), and old (24 months) male and female C57BL6 mice hippocampus was analyzed...
July 21, 2017: Journal of Neuroinflammation
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