检索结果-内蒙古大学图书馆

Optical Technology and Measurement for Industrial Applications Conference

作者： Nitta, Kouichi Kobe Univ Grad Sch Grad Syst Informat Rokkodai 1-1 Kobe Hyogo 6578501 Japan

ISBN: (数字)9781510647237

ISBN: (纸本)9781510647237;9781510647220

Single pixel imaging (SPI) is considered to be a promised technique in computational imaging because of some advantageous features and suitability for signal restoration with compressive sensing, deep learning, and so on. In this presentation, the principle of SPI is explained. In the SPI, two dimensional spatial modulation for optical signals is an important operations. A procedure for renewal of the modulation has been proposed. This procedure with spatial pattern shift is suitable for a some specific implementation based on SPI. Especially, it is useful for imaging of a target moving at a constant velocity. This procedure is introduced and usefulness of it is discussed.

关键词： Single pixel imaging Computational imaging spatial coding Image reconstruction Structured illumination

来源：评论

学校读者我要写书评

暂无评论

引用

NEUROSCIENCE LETTERS 2022年 790卷 136891页

作者： Zhang, Yi Fan Mameri, Samir Xie, Ting Sadoun, Amirouche Univ Toulouse 3 CNRS UMR 5549 Toulouse France Univ Paul Sabatier Univ Toulouse 3 Ctr Rech Cerveau & Cognit Toulouse France Univ Bordj Bou Arreridj El Anceur Algeria Univ Bejaia Lab Theoret Phys LPT Bejaia Algeria INSERM U1037 Ctr Rech Cancerol Toulouse CRCT F-31037 Toulouse France Univ Paul Sabatier III F-31400 Toulouse France CHU Purpan CNRS UMR 5549 Cerveau & Cognit Pavillon BaudotBP 25202 F-31052 Toulouse 03 France Theaterstr 26 Gottingen Germany

Neuroimaging studies have shown that brain activity is variable and changes according to stimuli and the environmental context, reflecting brain coding or information representations at different processing levels. However, little is known about activity organization that reflects coding strategies. Here, we explored and compared two different coding approaches, spatial via cross-correlation and intensity-based coding using mutual information. Using two fMRI datasets and different seeds, we searched for the spatial and intensity-based sim-ilarities with the seeds in brain activity. Our results showed that, apart from the seed regions, significant regions detected by intensity-based similarity analysis differ completely from those found using cross-correlation. These findings may indicate that information shared through spatial coding differs from that transmitted via non-spatial coding processes. Our results suggest that brain coding is organized in several different ways to opti-mize information processing.

关键词： spatial cross-correlation Intensity coding Mutual information Neuronal code spatial coding

来源：评论

学校读者我要写书评

暂无评论

Grid-cell modules remain coordinated when neural activity is dissociated from external sensory cues

引用

NEURON 2022年第11期110卷 1843-+页

作者： Waaga, Torgeir Agmon, Haggai Normand, Valentin A. Nagelhus, Anne Gardner, Richard J. Moser, May-Britt Moser, Edvard, I Burak, Yoram Norwegian Univ Sci & Technol Kavli Inst Syst Neurosci Trondheim Norway Norwegian Univ Sci & Technol Ctr Neural Computat Trondheim Norway Hebrew Univ Jerusalem Edmond & Lily Safra Ctr Brain Sci Jerusalem Israel Hebrew Univ Jerusalem Racah Inst Phys Jerusalem Israel

The representation of an animal's position in the medial entorhinal cortex (MEC) is distributed across several modules of grid cells, each characterized by a distinct spatial scale. The population activity within each module is tightly coordinated and preserved across environments and behavioral states. Little is known, however, about the coordination of activity patterns across modules. We analyzed the joint activity patterns of hundreds of grid cells simultaneously recorded in animals that were foraging either in the light, when sensory cues could stabilize the representation, or in darkness, when such stabilization was disrupted. We found that the states of different modules are tightly coordinated, even in darkness, when the internal representation of position within the MEC deviates substantially from the true position of the animal. These findings suggest that internal brain mechanisms dynamically coordinate the representation of position in different modules, ensuring that they jointly encode a coherent and smooth trajectory.

关键词： neural coding neural decoding grid cells entorhinal cortex spatial memory spatial coding population coding neural circuits

来源：评论

学校读者我要写书评

暂无评论

CA2: A Highly Connected Intrahippocampal Relay

ANNUAL REVIEW OF NEUROSCIENCE, VOL 43

引用

ANNUAL REVIEW OF NEUROSCIENCE, VOL 43 2020年 43卷 55-72页

作者： Middleton, Steven J. McHugh, Thomas J. RIKEN Ctr Brain Sci Lab Circuit & Behav Physiol Wako Saitama 3510198 Japan

Although Lorente de No' recognized the anatomical distinction of the hippocampal Cornu Ammonis (CA) 2 region, it had, until recently, been assigned no unique function. Its location between the key players of the circuit, CA3 and CA1, which along with the entorhinal cortex and dentate gyrus compose the classic trisynaptic circuit, further distracted research interest. However, the connectivity of CA2 pyramidal cells, together with unique patterns of gene expression, hints at a much larger contribution to hippocampal information processing than has been ascribed. Here we review recent advances that have identified new roles for CA2 in hippocampal centric processing, together with specialized functions in social memory and, potentially, as a broadcaster of novelty. These new data, together with CA2's role in disease, justify a closer look at how this small region exerts its influence and how it might best be exploited to understand and treat disease-related circuit dysfunctions.

关键词： hippocampus disease novelty spatial coding replay memory

来源：评论

学校读者我要写书评

暂无评论

IMPROVED MIMO RADAR CHANNEL ESTIMATION USING spatial coding

IMPROVED MIMO RADAR CHANNEL ESTIMATION USING SPATIAL CODING

引用

IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Aittomaki, Tuomas Koivunen, Visa Aalto Univ SMARAD CoE Dept Signal Proc & Acoust FI-00076 Aalto Finland

ISBN: (纸本)9781479903566

A spatial coding of the transmitted waveforms in a distributed MIMO radar system is proposed for reducing the impact of noise and interference on the channel matrix estimate. The channel matrix is needed in target parameter estimation as well as transmitter resource allocation and target recognition, for example. It is shown that when noise or interference are correlated after filtering at the receiver, it is possible decrease the error of the channel coefficient estimates by using the proposed coding method. Numerical results shown here demonstrate the benefits of the method in practical scenarios.

关键词： MIMO radar spatial coding channel estimation interference suppression

来源：评论

学校读者我要写书评

暂无评论

An Improved Pretraining Strategy-Based Scene Classification With Deep Learning

引用

IEEE GEOSCIENCE AND REMOTE SENSING LETTERS 2020年第5期17卷 844-848页

作者： Chen, Zongli Wang, Yiyue Han, Wei Feng, Ruyi Chen, Jia Dept Land & Resources Guizhou Prov Guiyang 550004 Peoples R China Northeast Forestry Univ Sch Comp Sci Harbin 150040 Peoples R China China Univ Geosci Sch Comp Sci Wuhan 430074 Peoples R China China Univ Geosci Hubei Key Lab Intelligent Geoinformat Proc Wuhan 430074 Peoples R China

High-resolution remote sensing (HRRS) image scene classification takes an important role in many applications and has attracted much attention. Recently, notable efforts have been made to present massive methods for HRRS scene classification, wherein deep-learning-based methods demonstrate remarkable performance compared with state-of-the-art methods. However, HRRS images contain complex contextual relationships and large differences of object scale, which are significantly different from natural images. The existing deep-learning-based scene classification methods are originally designed for natural image processing and have not been optimized to adapt to the characteristics of HRRS images, which significantly affects the efficiency of the feature extraction and recognition accuracy. In addition, when designing a model for remote sensing tasks, the pretraining of the model is time-consuming. The enormous amount of pretraining time and computation resources necessarily increase the difficulty of producing an excellent model. In this letter, focusing on the problems above, we proposed a new convolutional neural network (CNN)-based scene classification method. The CNN-based scene classification method is constructed by spatial-scale-aware blocks and is efficient in extracting the abundant spatial features, but can also adaptively adjust feature responses to maximize the function of informative features in the classification results. In addition, an HRRS imagery-based learning strategy is utilized to obtain an initial model for fine-tuning the model parameters, which drastically reduces the pretraining time. The proposed method has been demonstrated using two HRRS data sets, and experimental results have proven the superiority of the proposed method.

关键词： Feature extraction Adaptation models Computational modeling Remote sensing Deep learning Data models Convergence Deep learning high-resolution remote sensing (HRRS) scene classification spatial coding weight-adaptive

来源：评论

学校读者我要写书评

暂无评论

Attention and awareness: Representation of visuomotor space in split-brain patients

引用

CORTEX 2020年 122卷 253-262页

作者： Dosso, Jill A. Chua, Romeo Weeks, Daniel J. Turk, David J. Kingstone, Alan Univ British Columbia Dept Psychol Vancouver Campus2136 W Mall Vancouver BC V6T 1Z4 Canada Univ British Columbia Sch Kinesiol Vancouver BC Canada Univ Northern British Columbia Off President Prince George BC Canada Univ Bristol Sch Expt Psychol Bristol Avon England

Each cerebral hemisphere primarily controls and receives sensory input with regard to the contralateral hand. In the disconnected brain (split-brain), when the hands are uncrossed, direct visual access to each hand is available to the controlling (contralateral) hemisphere. However, when a hand crosses the midline, visual and tactile information regarding the hand are presented to different hemispheres. It is unknown how a contralateral hemisphere codes the position and orientation of a visually inaccessible hand in the disconnected brain. The present work addresses this issue. We ask how each hemisphere represents "its" hand across hand positions that span the midline in the absence of cortical input from the contralateral hemisphere. In other words, when a hand is placed across the midline and is visually inaccessible, is it represented by the controlling hemisphere: (1) in accordance with its new position with respect to the body (e.g., a left hand "becomes" a right effector when it crosses the midline), (2) with left/right position information unaltered (e.g., the left hand is represented as "left" regardless of its location), or (3) stripped of its location information altogether? The relationship between hand position and the spatial codes assigned to potential responses (an index of hand representation) was investigated in two split-brain patients using direct (Experiment 1) and orthogonal (Experiment 2) S-R compatibility paradigms. S-R compatibility effects in split-brain patients were consistent with those displayed by typical individuals. These findings suggest that position-based compatibility effects do not rely on cross-cortical connections. Rather, each hemisphere can accurately represent the full visuomotor space, a process that appears to be subserved by subcortical connections between the hemispheres. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： Split-brain S-R compatibility Visuomotor space spatial coding

来源：评论

学校读者我要写书评

暂无评论

Numerical-spatial representation affects spatial coding: binding errors across the numerical distance effect

引用

PSYCHONOMIC BULLETIN & REVIEW 2013年第6期20卷 1181-1186页

作者： Arend, Isabel Naparstek, Sharon Henik, Avishai Ben Gurion Univ Negev Dept Psychol IL-84105 Beer Sheva Israel Ben Gurion Univ Negev Zlotowski Ctr Neurosci IL-84105 Beer Sheva Israel

Does numerical-spatial representation affect feature binding? Studies of visual attention show that poor spatial coding leads to illusory conjunctions (ICs). In numerical cognition, it has been shown that numbers and space are not totally dissociated. This association underlies the numerical distance effect (DE): faster responses as the distance between the compared digits becomes larger (2 7 vs. 2 4). We used the DE to test whether numerical-spatial representation is available to visual processes that rely on spatial coding, such as feature binding. Participants reported the larger of two colored numbers. Both numerical distance (distances 2 and 5) and number-space congruity (e.g., congruent pair, 1 3;incongruent pair, 3 1) were analyzed. Results showed a higher proportion of ICs for distance 2 than for distance 5, providing strong evidence that numerical-spatial representation (1) entails a strong location code and (2) is available to visual processes that rely on location information.

关键词： Numerical distance Feature binding Illusory conjunctions spatial coding

来源：评论

学校读者我要写书评

暂无评论

Evidence of SQUARC and distance effects in a weight comparison task

引用

COGNITIVE PROCESSING 2019年第2期20卷 163-173页

作者： Dalmaso, Mario Vicovaro, Michele Univ Padua Dept Dev & Social Psychol Padua Italy Univ Padua Dept Gen Psychol Padua Italy

Stimuli associated with large quantities are typically responded to faster with a right-than a left-side key, whereas stimuli associated with small quantities are typically responded to faster with a left-than a right-side key. This phenomenon is known as the spatial-quantity association of response codes (SQUARC) effect. Here, in two experiments, we explored whether a SQUARC effect can emerge for light versus heavy items. Participants judged whether the weight associated with a central target word, describing an animal (e.g. 'cow';Experiment 1) or a material (e.g. 'iron';Experiment 2), was lighter or heavier than the weight associated with a reference word. Responses were provided with a left-and a right-side button. Then, participants estimated the weight associated with target and reference words. In both experiments, evidence for a SQUARC effect emerged. Moreover, response times for each target word decreased with absolute difference between its rated weight and the rated weight of the reference word, in line with a distance effect. Overall, these results provide evidence of a possible spatial representation of weight.

关键词： SQUARC effect SNARC-like effect Distance effect spatial coding Weight judgment

来源：评论

学校读者我要写书评

暂无评论

spatial coding of Individuals With Visual Impairments

引用

JOURNAL OF SPECIAL EDUCATION 2012年第3期46卷 180-190页

作者： Papadopoulos, Konstantinos Koustriava, Eleni Kartasidou, Lefkothea Univ Macedonia PC Thessaloniki 54006 Greece

The aim of this study is to examine the ability of children and adolescents with visual impairments to code and represent near space. Moreover, it examines the impact of the strategies they use and individual differences in their performance. A total of 30 individuals with visual impairments up to the age of 18 were given eight different object patterns in different arrays and were asked to code and represent each of them. The results revealed better performances by those who use an allocentric approach during spatial coding and those with residual vision. In fact, allocentric strategies were more prevalent in coding near space than egocentric ones. Moreover, the ability of participants to move independently was positively correlated with their ability to use the most effective haptic strategies. These findings suggest that children and adolescents with visual impairments are capable of using allocentric reference and providing a different perspective to the currently dominant one.

关键词： visual impairments spatial representation spatial coding near space

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：