解剖学和形态学
麻醉学
听力与言语-语言病理学
行为科学
心脏和心血管系统
细胞和组织工程学
临床神经病学
危重症监护医学
牙科,口腔外科和医学
皮肤病学
急诊医学
内分泌学和新陈代谢
肠胃学和肝脏学
老人病学和老年医学
卫生保健科学和服务
血液学
免疫学
传染病
综合和补充性医学
医学伦理学
医学信息学
医学实验室技术
医学,全科和内科
医学,法律
医学,研究和试验
神经系统科学
护理
营养学和饮食学
产科医学和妇科医学
肿瘤学
眼科学
整形外科学
耳鼻喉科学
病理学
儿科学
周围血管疾病
药理学和药剂学
生理学
基本医疗保健
精神病学
公共、环境和职业卫生
放射学,核医学和医学成像
康复学
生殖生物学
呼吸系统
风湿病学
运动科学
外科学
毒理学
热带医学
泌尿学和肾脏学
病毒学
老年医学
健康政策和服务
心理学,临床
abstract::The short-term (i.e., days) and long-term (i.e., months) effects of adaptation to posturography examinations were investigated in 12 normal subjects who were repeatedly examined for five consecutive days and again after 90 days. The examinations were conducted both with eyes open and closed, and the perturbations were...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s00422-001-0305-y
更新日期:2002-05-01 00:00:00
abstract::In many applications of signal processing, especially in communications and biomedicine, preprocessing is necessary to remove noise from data recorded by multiple sensors. Typically, each sensor or electrode measures the noisy mixture of original source signals. In this paper a noise reduction technique using independ...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s00422-001-0298-6
更新日期:2002-04-01 00:00:00
abstract::Isolated and cultured neonatal cardiac myocytes contract spontaneously and cyclically, and have the properties of a non-linear oscillator. In this study, we have analyzed the relationship between the fluctuation of contraction rhythm of spontaneously beating cultured cardiac myocytes, and the coupling strength among t...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s00422-001-0285-y
更新日期:2002-02-01 00:00:00
abstract::Most common motor acts involve highly redundant effector systems. Understanding how such systems are controlled by the nervous system is a long-standing scientific challenge. Most proposals for solving this problem are based on the assumption that a particular solution, which optimizes additional constraints, is selec...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220100279
更新日期:2002-01-01 00:00:00
abstract::The operation of a hierarchical competitive network model (VisNet) of invariance learning in the visual system is investigated to determine how this class of architecture can solve problems that require the spatial binding of features. First, we show that VisNet neurons can be trained to provide transform-invariant di...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220100284
更新日期:2002-01-01 00:00:00
abstract::The visual system is constantly confronted with the problem of integrating local signals into more global arrangements. This arises from the nature of early cell responses, whether they signal localized measures of luminance, motion, retinal position differences, or discontinuities. Consequently, from sparse, local me...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220100258
更新日期:2001-11-01 00:00:00
abstract::The activation patterns underlying the electrical activity of the heart during atrial fibrillation (AF) are not entirely random. The aim of this study was to assess the local organization of the activation processes during AF by estimating the non-linear coupling between activation sequences (ASs) in two atrial sites....
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220100252
更新日期:2001-09-01 00:00:00
abstract::The Hodgkin-Huxley equations with a slight modification are investigated, in which the inactivation process (h) of sodium channels or the activation process of potassium channels (n) is slowed down. We show that the equations produce a variety of action potential waveforms ranging from a plateau potential, such as in ...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/PL00007996
更新日期:2001-07-01 00:00:00
abstract::The effect of spatial frequency discrimination learning on spatial frequency detection tuning curves, obtained by a summation to threshold paradigm, has been investigated. Three human observers were exposed to a grating discrimination task for longer than two weeks, and their detection thresholds for compound Gabor gr...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/PL00007983
更新日期:2001-05-01 00:00:00
abstract::In this work we show the application of a measure of entropy defined from the wavelet transform, namely the wavelet entropy (WS), to the study of event-related potentials (ERPs). WS was computed for ERPs recorded from nine healthy subjects with three different types of stimuli, among them target stimuli in a cognitive...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220000212
更新日期:2001-04-01 00:00:00
abstract::The frequency sensitivity of weak periodic signal detection has been studied via numerical simulations for both a single neuron and a neuronal network. The dependence of the critical amplitude of the signal upon its frequency and a resonance between the intrinsic oscillations of a neuron and the signal could account f...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220000203
更新日期:2001-03-01 00:00:00
abstract::In previous work it has been shown in posture experiments of the human arm that reflexive dynamics were substantial for narrow-band stochastic force disturbances. The estimated reflex gains varied substantially with the frequency content of the disturbances. The present study analyses a simplified linear model of the ...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/PL00007980
更新日期:2001-02-01 00:00:00
abstract::The detection of small radially symmetric targets was studied using a subthreshold summation paradigm. Small disc and disc-like patterns with diameters up to 0.60 were used for superposition on Bessel functions of zero order, subthreshold contrast and various spatial frequencies. Contrast interrelation functions prove...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220170005
更新日期:2001-01-01 00:00:00
abstract::Stochastic resonance is demonstrated in a simple energy detector model, as a non-monotonic relationship between signal-to-noise ratio and detection of a sinusoid signal in bandpass-limited Gaussian noise. The behaviour of the model detecting signals of various intensities and signal-to-noise ratios was investigated. S...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220000176
更新日期:2000-11-01 00:00:00
abstract::Based on a complexity analysis of mutual information transmission of EEG developed by us [Xu J, Liu Z, Liu R, Yang Q (1997) Physica D 106: 363-374], dynamic processes of the complexity of mutual information transmission in human brains were studied. To diminish possible problems due to coarse graining preprocessing, s...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220000158
更新日期:2000-10-01 00:00:00
abstract::Arthropods as well as mammals are able to return straight home after a random search excursion under conditions that are designed to exclude all external cues. After a brief clarification of the terminology, two principal systems of information processing that can achieve this performance are introduced and analysed: ...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220000169
更新日期:2000-09-01 00:00:00
abstract::The idea that a sparse representation is the computational principle of visual systems has been supported by Olshausen and Field [Nature (1996) 381: 607-609] and many other studies. On the other hand neurons in the inferotemporal cortex respond to moderately complex features called icon alphabets, and such neurons res...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220000149
更新日期:2000-08-01 00:00:00
abstract::Cortical circuits have been proposed to encode information by forming stable spatially structured attractors. Experimentally in the primary somatosensory cortex of the monkey, temporally invariant stimuli lead to spatially structured activity patterns. The purpose of this work is to study a recurrent cortical neural n...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050599
更新日期:2000-06-01 00:00:00
abstract::Inner hair cells (IHCs) transform the mechanical movements of the basilar membrane into electrical impulses. The impulse coding of the IHCs is the main information carrier in the auditory process and is the basis for improvements of cochlea implants as well as for low rate, high-quality speech processing and compressi...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050582
更新日期:2000-04-01 00:00:00
abstract::A system of coupled bistable Hopf oscillators with an external periodic input source was used to model the ability of interacting neural populations to synchronize and desynchronize in response to variations of the input signal. We propose that, in biological systems, the settings of internal and external coupling str...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050023
更新日期:2000-03-01 00:00:00
abstract::The myoskeletal inverse dynamics problem and the myocybernetic control inverse problem were investigated with respect to their ill-posedness. The first problem consists of finding from observed experimental motion and reaction force data the resultant muscle moments that generated the observed motion, while the second...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050013
更新日期:2000-02-01 00:00:00
abstract::A central pattern generator (CPG) is built to control a mechanical device (plant) inspired by the pyloric chamber of the lobster. Conductance-based models are used to construct the neurons of the CPG. The plant has an associated function that measures the amount of food flowing through it per unit of time. We search f...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/PL00007963
更新日期:2000-01-01 00:00:00
abstract::A nonstationary signal analysis technique is introduced, which regards an oscillatory physiological signal as a sum of its fragments, presented in the form of a fragmentary decomposition (FD). The virtue of FD is that it is free of the necessity to choose a priori the basis functions intended for signal analysis or sy...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050575
更新日期:1999-11-01 00:00:00
abstract::Within a wide class of multichannel models of the visual system it is suggested that spatial distributions of luminance are processed by the independent activation of grating detectors, or spatial frequency channels. Probability summation is often described in terms of Quick's nonlinear pooling model [Quick RF (1974) ...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050561
更新日期:1999-09-01 00:00:00
abstract::We present a biologically oriented model that accounts for left-right discrimination in the cockroach's escape behavior. The model includes the main groups of neurons found to be involved in the escape response. Each one of the included neurons is described by the actual processes taking place in an individual neuron ...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050546
更新日期:1999-08-01 00:00:00
abstract::A method that enables measurement of the degree of coupling between two signals is presented. The method is based on the definition of an uncoupling function calculating, by means of entropy rates, the minimum amount of independent information (i.e. the information carried by one signal which cannot be derived from th...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050549
更新日期:1999-08-01 00:00:00
abstract::Learning to make reaching movements in force fields was used as a paradigm to explore the system architecture of the biological adaptive controller. We compared the performance of a number of candidate control systems that acted on a model of the neuromuscular system of the human arm and asked how well the dynamics of...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050543
更新日期:1999-07-01 00:00:00
abstract::The problems related to kinematic redundancy in both task and joint space were investigated for arm prehension movements in this paper. After a detailed analysis of kinematic redundancy of the arm, it is shown that the redundancy problem is ill posed only for the control of hand orientation. An experiment was then des...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050538
更新日期:1999-06-01 00:00:00
abstract::Based on the kinematics of goal-directed aiming movements in a reciprocal Fitts' task, a minimal limit cycle model is proposed that is capable of producing the behavior observed at levels of task difficulty ranging from 3 to 7. From graphical and statistical analyses of the phase planes, Hooke's planes and velocity pr...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050521
更新日期:1999-04-01 00:00:00
abstract::Within a linear field approach, an architectural model for simple cell direction selectivity in the visual cortex is proposed. The origin of direction selectivity is related to recurrent intracortical interactions with a spatially asymmetric character along the axis of stimulus motion. No explicit asymmetric temporal ...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050515
更新日期:1999-03-01 00:00:00
abstract::The size of a pair of cortical ocular dominance columns determines a basic anatomical module of V-1 which Hubel and Wiesel have termed the hypercolumn. Does this correspond to a basic functional, or psychophysically measurable, module as well? This is the basic question addressed in the present paper. Since the ocular...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050510
更新日期:1999-02-01 00:00:00
abstract::A multisegment, multijoint model of a falling animal is presented to examine the effectiveness of a two-stage control scheme in a zero-momentum self-righting maneuver. The model contains a much larger number of degrees of freedom than is required to execute a self-righting maneuver and is thus capable of providing mul...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050488
更新日期:1998-11-01 00:00:00
abstract::The impact of dendritic geometry on somatopetal transfer of the current generated by steady uniform activation of excitatory synaptic conductance distributed over passive, or active (Hodgkin-Huxley type), dendrites was studied in simulated neurons. Such tonic activation was delivered to the uniform dendrite and to the...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050473
更新日期:1998-09-01 00:00:00
abstract::According to modern views of the cerebellum in motor control, each cerebellar functional unit, or microzone, learns how to execute predictive and coordinative control, based on long-term depression of the granule cell-Purkinje cell synapses. In the present paper, in light of recent experimental and theoretical studies...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050462
更新日期:1998-08-01 00:00:00
abstract::A pacemaker cell pair model and the dynamic interaction between the two pacemaker cells is described in this paper. It is an extension of our single pacemaker cell model, in which we studied its response to repetitive external depolarization stimulations. This model is a simple model based on the two most important fu...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050460
更新日期:1998-07-01 00:00:00
abstract::Saccadic averaging is the phenomenon that two simultaneously presented retinal inputs result in a saccade with an endpoint located on an intermediate position between the two stimuli. Recordings from neurons in the deeper layers of the superior colliculus have revealed neural correlates of saccade averaging, indicatin...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050450
更新日期:1998-06-01 00:00:00
abstract::This paper presents a mathematical model for the learning of accurate human arm movements. Its main features are that the movement is the superposition of smooth submovements, the intrinsic deviation of arm movements is considered, visual and kinesthetic feed-back are integrated in the motion control, and the movement...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050435
更新日期:1998-04-01 00:00:00
abstract::Two different chaotic time series analysis methods--the correlation dimension and nonlinear forecasting--are introduced and then used to process the interspike intervals (ISI) of the action potential trains propagated along a single nerve fiber of the anesthetized rat. From the results, the conclusion is drawn that co...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050422
更新日期:1998-02-01 00:00:00
abstract::A neural model is proposed for the spatiotemporal properties of simple cells in the visual cortex. In the model, several cortical cells are arranged on a ring, with mutual excitatory or inhibitory connections. The cells also receive excitatory inputs either from lagged and nonlagged cells of the lateral geniculate nuc...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050383
更新日期:1997-10-01 00:00:00
abstract::A linear analogue network model is proposed to describe the neuronal circuit of the outer retina consisting of cones, horizontal cells, and bipolar cells. The model reflects previous physiological findings on the spatial response properties of these neurons to dim illumination and is expressed by physiological mechani...
journal_title:Biological cybernetics
pub_type: 杂志文章
doi:10.1007/s004220050377
更新日期:1997-09-01 00:00:00