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State Dependent Cortical Processing
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Book Synopsis State-dependent Cortical Processing by : Michael Goard
Download or read book State-dependent Cortical Processing written by Michael Goard and published by . This book was released on 2009 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nucleus basalis of the basal forebrain is an essential component of the neuromodulatory system controlling the behavioral state of an animal, and it is thought to play key roles in regulating arousal and attention. However, the effect of NB activation on sensory processing remains poorly understood. Using polytrode recording in rat visual cortex, we show that NB stimulation causes prominent decorrelation between neurons and marked improvement in the reliability of neuronal responses to natural scenes. The decorrelation depends on local activation of cortical muscarinic acetylcholine receptors, while the increased reliability involves distributed neural circuits, as evidenced by NB-induced changes in thalamic responses. Further analysis showed that the decorrelation and increased reliability improve cortical representation of natural stimuli in a complementary manner. Thus, the basal forebrain neuromodulatory circuit, which is known to be activated during aroused and attentive states, acts through both local and distributed mechanisms to improve sensory coding.
Book Synopsis Mechanisms Underlying State-dependent Modulation of Cortical Activity by : Sergio E. Arroyo
Download or read book Mechanisms Underlying State-dependent Modulation of Cortical Activity written by Sergio E. Arroyo and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The processing of information in cortical circuits is dynamic and varies widely across behavioral and cognitive states. In the cortex, sensory information from the periphery is transformed by a combination of local recurrent connections, interactions with other cortical areas, and inputs from several ascending neuromodulatory systems. However, the precise cellular mechanisms underlying state-dependent modulation of cortical circuits remain poorly understood. Here, I describe two approaches to address this question: an in vitro approach to study the impact of cholinergic signaling on cortical circuits, and an in vivo approach to investigate cellular mechanisms underlying modulation of visual responses in the awake, behaving mouse. Many lines of evidence suggest that the cholinergic system plays an important role in coordinating many large-scale changes in brain activity associated with behavioral state. To investigate how activation of cholinergic axons modulates cortical circuits, we developed methods to transduce cholinergic neurons in the basal forebrain with channelrhodopsin-2. This approach allowed us to selectively activate cholinergic terminals in the cortex in vitro and study (1) the cortical cell-types targeted by cholinergic axons and (2) the kinetics and synaptic properties of cholinergic signaling. To study the cellular mechanisms underlying state-dependent modulation of visual responses, we obtained whole-cell recordings from visual cortical neurons in the awake, behaving mouse. We characterized two cortical network states that were tightly correlated with distinct wakeful behavioral states: quiet wakefulness and locomotion. We demonstrated that subthreshold responses to visual stimulation were larger and more reliable during locomotion due to an increase in excitatory and inhibitory conductances and a shift in the stimulus-evoked reversal potential. Furthermore, by obtaining two simultaneous whole-cell recordings from visual cortical neurons, we were able to measure how correlated subthreshold activity was modulated by behavioral state and the patterns of excitatory and inhibitory synaptic inputs that generate these correlations. Together, these experiments provide insight into the cellular mechanisms that underlie state-dependent changes in cortical activity, sensory processing, and behavior.
Book Synopsis Pervasive Haptics by : Hiroyuki Kajimoto
Download or read book Pervasive Haptics written by Hiroyuki Kajimoto and published by Springer. This book was released on 2016-04-27 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the state of the art in diverse areas of haptics (touch)-related research, including the psychophysics and neurophysiology of haptics, development of haptics displays and sensors, and applications to a wide variety of fields such as industry, education, therapy, medicine, and welfare for the visually impaired. It also discusses the potential of future haptics interaction, such as haptics for emotional control and remote haptics communication. The book offers a valuable resource not only for haptics and human interface researchers, but also for developers and designers at manufacturing corporations and in the entertainment industries.
Book Synopsis The Neurobiology of Olfaction by : Anna Menini
Download or read book The Neurobiology of Olfaction written by Anna Menini and published by CRC Press. This book was released on 2009-11-24 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Overview of Advances in OlfactionThe common belief is that human smell perception is much reduced compared with other mammals, so that whatever abilities are uncovered and investigated in animal research would have little significance for humans. However, new evidence from a variety of sources indicates this traditional view is likely
Book Synopsis Discovering the Brain by : National Academy of Sciences
Download or read book Discovering the Brain written by National Academy of Sciences and published by National Academies Press. This book was released on 1992-01-01 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: The brain ... There is no other part of the human anatomy that is so intriguing. How does it develop and function and why does it sometimes, tragically, degenerate? The answers are complex. In Discovering the Brain, science writer Sandra Ackerman cuts through the complexity to bring this vital topic to the public. The 1990s were declared the "Decade of the Brain" by former President Bush, and the neuroscience community responded with a host of new investigations and conferences. Discovering the Brain is based on the Institute of Medicine conference, Decade of the Brain: Frontiers in Neuroscience and Brain Research. Discovering the Brain is a "field guide" to the brainâ€"an easy-to-read discussion of the brain's physical structure and where functions such as language and music appreciation lie. Ackerman examines: How electrical and chemical signals are conveyed in the brain. The mechanisms by which we see, hear, think, and pay attentionâ€"and how a "gut feeling" actually originates in the brain. Learning and memory retention, including parallels to computer memory and what they might tell us about our own mental capacity. Development of the brain throughout the life span, with a look at the aging brain. Ackerman provides an enlightening chapter on the connection between the brain's physical condition and various mental disorders and notes what progress can realistically be made toward the prevention and treatment of stroke and other ailments. Finally, she explores the potential for major advances during the "Decade of the Brain," with a look at medical imaging techniquesâ€"what various technologies can and cannot tell usâ€"and how the public and private sectors can contribute to continued advances in neuroscience. This highly readable volume will provide the public and policymakersâ€"and many scientists as wellâ€"with a helpful guide to understanding the many discoveries that are sure to be announced throughout the "Decade of the Brain."
Book Synopsis Neurobiology of Sensation and Reward by : Jay A. Gottfried
Download or read book Neurobiology of Sensation and Reward written by Jay A. Gottfried and published by CRC Press. This book was released on 2011-03-28 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Synthesizing coverage of sensation and reward into a comprehensive systems overview, Neurobiology of Sensation and Reward presents a cutting-edge and multidisciplinary approach to the interplay of sensory and reward processing in the brain. While over the past 70 years these areas have drifted apart, this book makes a case for reuniting sensation a
Book Synopsis State Dependent Function and Dynamics in Cerebral Cortical Networks by : Leila Fakhraei
Download or read book State Dependent Function and Dynamics in Cerebral Cortical Networks written by Leila Fakhraei and published by . This book was released on 2018 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cerebral cortex exhibits vigorous ongoing, internal neural activity even with no sensory input is present or the animal is minimally engaged in a task or behavior. This internal ongoing activity is not static; the 'cortical state' varies ranging from synchronous and highly correlated activity to asynchronous and weakly correlated neural activity. The main goal of the work presented here is to understand how changes in cortical states effect several aspects of cortical function and dynamics. To meet this goal, we did three separate projects. First, we compared the predictability of neuronal network dynamics across cortical states in somatosensory cortex of anesthetized rats. We found that predictably was not static; it depends on cortical state and the duration of prediction. Second, we implemented a closed-loop feedback control to control the neural activity in the motor cortex of anesthetized mice. We found a trade-off between the accuracy and cost of control as we tuned the cortical state with anesthetic drugs. Finally, we studied how single neuron is related to summed activity of large population, referred to as population coupling. We found different neurons within the same network can have diverse population coupling and that this coupling change if we manipulate inhibitory signaling in the network.
Book Synopsis Micro-, Meso- and Macro-Connectomics of the Brain by : Henry Kennedy
Download or read book Micro-, Meso- and Macro-Connectomics of the Brain written by Henry Kennedy and published by Springer. This book was released on 2016-03-10 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has brought together leading investigators who work in the new arena of brain connectomics. This includes ‘macro-connectome’ efforts to comprehensively chart long-distance pathways and functional networks; ‘micro-connectome’ efforts to identify every neuron, axon, dendrite, synapse, and glial process within restricted brain regions; and ‘meso-connectome’ efforts to systematically map both local and long-distance connections using anatomical tracers. This book highlights cutting-edge methods that can accelerate progress in elucidating static ‘hard-wired’ circuits of the brain as well as dynamic interactions that are vital for brain function. The power of connectomic approaches in characterizing abnormal circuits in the many brain disorders that afflict humankind is considered. Experts in computational neuroscience and network theory provide perspectives needed for synthesizing across different scales in space and time. Altogether, this book provides an integrated view of the challenges and opportunities in deciphering brain circuits in health and disease.
Book Synopsis From Neurons to Neighborhoods by : National Research Council
Download or read book From Neurons to Neighborhoods written by National Research Council and published by National Academies Press. This book was released on 2000-11-13 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: How we raise young children is one of today's most highly personalized and sharply politicized issues, in part because each of us can claim some level of "expertise." The debate has intensified as discoveries about our development-in the womb and in the first months and years-have reached the popular media. How can we use our burgeoning knowledge to assure the well-being of all young children, for their own sake as well as for the sake of our nation? Drawing from new findings, this book presents important conclusions about nature-versus-nurture, the impact of being born into a working family, the effect of politics on programs for children, the costs and benefits of intervention, and other issues. The committee issues a series of challenges to decision makers regarding the quality of child care, issues of racial and ethnic diversity, the integration of children's cognitive and emotional development, and more. Authoritative yet accessible, From Neurons to Neighborhoods presents the evidence about "brain wiring" and how kids learn to speak, think, and regulate their behavior. It examines the effect of the climate-family, child care, community-within which the child grows.
Book Synopsis State-Dependence is State-Dependent by : Ethan Gregory McBride
Download or read book State-Dependence is State-Dependent written by Ethan Gregory McBride and published by . This book was released on 2018 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decade, mice have emerged as a useful model for studying vision, owing in large part to their genetic tractability. Such studies have also yielded the unexpected and fascinating finding that movement, particularly locomotion, has a striking effect on cortical visual activity in mice. The discovery of so-called state-dependent visual processing suggested that the role of even primary sensory areas is not as simple as previously thought. Many studies showed that locomotion enhances visual neural activity, but few directly examined whether it actually improved sensory perception in a behavioral task. For my dissertation project I addressed this by examining the interactions between locomotion-dependent modulation of brain state and different goal-directed sensory selection brain states. Two groups of mice were trained to visually monitor either one of two locations (selective) or both (non-selective) for a contrast change, and this simple difference produced a spatially selective and non-selective brain state in primary visual cortex (V1), respectively. Locomotion affected the two groups of mice differently, impairing performance and neural representations of visual information of selective mice, while having no effect on non-selective mice. These and other results suggest that these two groups of mice use local versus global mechanisms to perform their respective tasks, and in the case of selective mice, the global influence of locomotion disrupts their locally modulated brain state and impairs performance. Locomotion influences brain state differently, depending on the whether the animal employs a spatially selective state to perform its task. Thus, state-dependence is state-dependent. These findings demonstrate the importance of studying complex interactions, and argue for reducing reductionism in neuroscience as we gain the necessary technology to carry out such studies. Moving forward, this mouse model will do just that, and enable investigation into the cell type and circuit mechanisms underlying these phenomena. Wading into the enormous complexity of the brain may ultimately be the only way to understand how it works as a whole.
Book Synopsis Neural Networks and Brain Function by : Edmund T. Rolls
Download or read book Neural Networks and Brain Function written by Edmund T. Rolls and published by Oxford University Press, USA. This book was released on 1998 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the types of computation that can be performed by biologically plausible neural networks and shows how they may be implemented in different systems of the brain. It is structured in three sections, each of which addresses a different need. The first introduces and analyzes the operation of several fundamental types of neural networks. The second discusses real neural networks in several brain systems, and shows how it is becoming possible to construct theories about the way different parts of the brain work. This section also analyzes the various neuroscience and neurocomputation techniques that need to be combined to ensure further progress in understanding the mechanism of brain processes. The third section, a collection of appendices. introduces the formal quantitative approaches to many of the networks described. Neural Networks and Brain Function is an accessible, clear introduction for researchers and students in neuroscience and artificial intelligence to the fascinating problems of how the brain works and how behavior is determined.
Book Synopsis Rhythms of the Brain by : Gyorgy Buzsaki
Download or read book Rhythms of the Brain written by Gyorgy Buzsaki and published by Oxford University Press. This book was released on 2006-08-03 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides eloquent support for the idea that spontaneous neuron activity, far from being mere noise, is actually the source of our cognitive abilities. In a sequence of "cycles," György Buzsáki guides the reader from the physics of oscillations through neuronal assembly organization to complex cognitive processing and memory storage. His clear, fluid writing-accessible to any reader with some scientific knowledge-is supplemented by extensive footnotes and references that make it just as gratifying and instructive a read for the specialist. The coherent view of a single author who has been at the forefront of research in this exciting field, this volume is essential reading for anyone interested in our rapidly evolving understanding of the brain.
Book Synopsis The Neural Bases of Multisensory Processes by : Micah M. Murray
Download or read book The Neural Bases of Multisensory Processes written by Micah M. Murray and published by CRC Press. This book was released on 2011-08-25 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has become accepted in the neuroscience community that perception and performance are quintessentially multisensory by nature. Using the full palette of modern brain imaging and neuroscience methods, The Neural Bases of Multisensory Processes details current understanding in the neural bases for these phenomena as studied across species, stages of development, and clinical statuses. Organized thematically into nine sub-sections, the book is a collection of contributions by leading scientists in the field. Chapters build generally from basic to applied, allowing readers to ascertain how fundamental science informs the clinical and applied sciences. Topics discussed include: Anatomy, essential for understanding the neural substrates of multisensory processing Neurophysiological bases and how multisensory stimuli can dramatically change the encoding processes for sensory information Combinatorial principles and modeling, focusing on efforts to gain a better mechanistic handle on multisensory operations and their network dynamics Development and plasticity Clinical manifestations and how perception and action are affected by altered sensory experience Attention and spatial representations The last sections of the book focus on naturalistic multisensory processes in three separate contexts: motion signals, multisensory contributions to the perception and generation of communication signals, and how the perception of flavor is generated. The text provides a solid introduction for newcomers and a strong overview of the current state of the field for experts.
Book Synopsis Reach-to-Grasp Behavior by : Daniela Corbetta
Download or read book Reach-to-Grasp Behavior written by Daniela Corbetta and published by Routledge. This book was released on 2018-08-28 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reaching for objects in our surroundings is an everyday activity that most humans perform seamlessly a hundred times a day. It is nonetheless a complex behavior that requires the perception of objects’ features, action selection, movement planning, multi-joint coordination, force regulation, and the integration of all of these properties during the actions themselves to meet the successful demands of extremely varied task goals. Even though reach-to-grasp behavior has been studied for decades, it has, in recent years, become a particularly growing area of multidisciplinary research because of its crucial role in activities of daily living and broad range of applications to other fields, including physical rehabilitation, prosthetics, and robotics. This volume brings together novel and exciting research that sheds light into the complex sensory-motor processes involved in the selection and production of reach-to-grasp behaviors. It also offers a unique life-span and multidisciplinary perspective on the development and multiple processes involved in the formation of reach-to-grasp. It covers recent and exciting discoveries from the fields of developmental psychology and learning sciences, neurophysiology and brain sciences, movement sciences, and the dynamic field of developmental robotics, which has become a very active applied field relying on biologically inspired models. This volume is a rich and valuable resource for students and professionals in all of these research fields, as well as cognitive sciences, rehabilitation, and other applied sciences.
Book Synopsis Auditory Cortical Activity in Synchronized and Desynchronized States by : Stephan Marguet
Download or read book Auditory Cortical Activity in Synchronized and Desynchronized States written by Stephan Marguet and published by . This book was released on 2010 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cortical information processing depends critically on an animal's brain state. Previous research has revealed there is a great deal of variability in cortical responses to repeated stimuli. This thesis addresses the question of whether activity and response variability in rat auditory cortex depends on brain state. Specifically, we hypothesized that both spontaneous and evoked activity differ between states; furthermore that cortical responses in higher-frequency "desynchronized" EEG states would be less variable and follow sensory input up to higher temporal modulation frequencies. We first assessed the spontaneous activity of auditory cortex during silence. During synchronized "slow wave" EEG states the spike counts of individual neurons in sequential time bins were irregular, but this irregular firing was coordinated across the neural population. Spike counts were more regular following a tail pinch-induced shift to higher-frequency EEG, and the population-wide coordination disappeared. We also uncovered a set of high-firing neurons with independent, rhythmic activity during desynchronized states, peaking between 8 to 18 Hz. Next we characterized responses to loud single-click stimuli. Many neurons discharged short-latency spikes with similar latency across states. These preserved spike latencies manifested as brief, sub-50ms population sequences of activity with similar profiles in different brain states. In some experiments we observed late, long-lasting effect of clicks on firing rates in synchronized states. In our last study, we show that evoked local field potentials (LFPs) can follow high-frequency amplitude modulations of broadband noise during desynchronized regimes. Spikes also track input more reliably and can be better predicted from stimuli in desynchronized states than in slow-wave states. Finally, we address whether LFPs reliably predict neural activity, and show that in most cases LFPs explain more spiking variability than our amplitude-modulated white noise stimuli. Thus much 'noise' in neural responses is not cell-specific, but reflects a source shared across many cells; such variability is state-dependent, and can be accounted for by LFP dynamics. Our first studies demonstrate that despite clear changes in spontaneous activity, strong onset responses to discrete broadband stimuli are often preserved across states. The final study suggests the desynchronized state supports improved representation of temporally modulated stimuli in auditory cortex.
Book Synopsis Jasper's Basic Mechanisms of the Epilepsies by : Jeffrey Noebels
Download or read book Jasper's Basic Mechanisms of the Epilepsies written by Jeffrey Noebels and published by OUP USA. This book was released on 2012-06-29 with total page 1258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Jasper's Basic Mechanisms, Fourth Edition, is the newest most ambitious and now clinically relevant publishing project to build on the four-decade legacy of the Jasper's series. In keeping with the original goal of searching for "a better understanding of the epilepsies and rational methods of prevention and treatment.", the book represents an encyclopedic compendium neurobiological mechanisms of seizures, epileptogenesis, epilepsy genetics and comordid conditions. Of practical importance to the clinician, and new to this edition are disease mechanisms of genetic epilepsies and therapeutic approaches, ranging from novel antiepileptic drug targets to cell and gene therapies.
Book Synopsis Biophysics of Computation by : Christof Koch
Download or read book Biophysics of Computation written by Christof Koch and published by Oxford University Press. This book was released on 2004-10-28 with total page 587 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neural network research often builds on the fiction that neurons are simple linear threshold units, completely neglecting the highly dynamic and complex nature of synapses, dendrites, and voltage-dependent ionic currents. Biophysics of Computation: Information Processing in Single Neurons challenges this notion, using richly detailed experimental and theoretical findings from cellular biophysics to explain the repertoire of computational functions available to single neurons. The author shows how individual nerve cells can multiply, integrate, or delay synaptic inputs and how information can be encoded in the voltage across the membrane, in the intracellular calcium concentration, or in the timing of individual spikes.Key topics covered include the linear cable equation; cable theory as applied to passive dendritic trees and dendritic spines; chemical and electrical synapses and how to treat them from a computational point of view; nonlinear interactions of synaptic input in passive and active dendritic trees; the Hodgkin-Huxley model of action potential generation and propagation; phase space analysis; linking stochastic ionic channels to membrane-dependent currents; calcium and potassium currents and their role in information processing; the role of diffusion, buffering and binding of calcium, and other messenger systems in information processing and storage; short- and long-term models of synaptic plasticity; simplified models of single cells; stochastic aspects of neuronal firing; the nature of the neuronal code; and unconventional models of sub-cellular computation.Biophysics of Computation: Information Processing in Single Neurons serves as an ideal text for advanced undergraduate and graduate courses in cellular biophysics, computational neuroscience, and neural networks, and will appeal to students and professionals in neuroscience, electrical and computer engineering, and physics.
