51 research outputs found
Cochlear-bone wave can yield a hearing sensation as well as otoacoustic emission
A hearing sensation arises when the elastic basilar membrane inside the
cochlea vibrates. The basilar membrane is typically set into motion through
airborne sound that displaces the middle ear and induces a pressure difference
across the membrane. A second, alternative pathway exists, however: stimulation
of the cochlear bone vibrates the basilar membrane as well. This pathway,
referred to as bone conduction, is increasingly used in the construction of
headphones that bypass the ear canal and the middle ear. Furthermore,
otoacoustic emissions, sounds generated inside the ear and measured in the ear
canal, may not involve the usual wave on the basilar membrane, suggesting that
additional cochlear structures are involved in their propagation. Here we
describe a novel propagation mode that emerges through deformation of the
cochlear bone. Through a mathematical and computational approach we demonstrate
that this wave can explain bone conduction as well as numerous properties of
otoacoustic emissions.Comment: 37 pages, 4 figures, Nature Communications 201
How mRNA localization and protein synthesis sites influence dendritic protein distribution and dynamics
In this issue ofNeuron,Fonkeu et al. (2019)present a mathematical model of mRNA and protein synthesis,degradation, diffusion, and trafficking in neuronal dendrites. The model can predict the spatial distributionand temporal dynamics of proteins along dendrites. The authors use the model to account forin situimagingdata of CaMKII⍺mRNA and protein in hippocampal neurons
The orbitofrontal cortex maps future navigational goals
Accurate navigation to a desired goal requires consecutive estimates of spatial relationships between the current position and future destination throughout the journey. Although neurons in the hippocampal formation can represent the position of an animal as well as its nearby trajectories their role in determining the destination of the animal has been questioned. It is, thus, unclear whether the brain can possess a precise estimate of target location during active environmental exploration. Here we describe neurons in the rat orbitofrontal cortex (OFC) that form spatial representations persistently pointing to the subsequent goal destination of an animal throughout navigation. This destination coding emerges before the onset of navigation, without direct sensory access to a distal goal, and even predicts the incorrect destination of an animal at the beginning of an error trial. Goal representations in the OFC are maintained by destination-specific neural ensemble dynamics, and their brief perturbation at the onset of a journey led to a navigational error. These findings suggest that the OFC is part of the internal goal map of the brain, enabling animals to navigate precisely to a chosen destination that is beyond the range of sensory perception
Representation of Dynamical Stimuli in Populations of Threshold Neurons
Many sensory or cognitive events are associated with dynamic current modulations in cortical neurons. This raises an urgent demand for tractable model approaches addressing the merits and limits of potential encoding strategies. Yet, current theoretical approaches addressing the response to mean- and variance-encoded stimuli rarely provide complete response functions for both modes of encoding in the presence of correlated noise. Here, we investigate the neuronal population response to dynamical modifications of the mean or variance of the synaptic bombardment using an alternative threshold model framework. In the variance and mean channel, we provide explicit expressions for the linear and non-linear frequency response functions in the presence of correlated noise and use them to derive population rate response to step-like stimuli. For mean-encoded signals, we find that the complete response function depends only on the temporal width of the input correlation function, but not on other functional specifics. Furthermore, we show that both mean- and variance-encoded signals can relay high-frequency inputs, and in both schemes step-like changes can be detected instantaneously. Finally, we obtain the pairwise spike correlation function and the spike triggered average from the linear mean-evoked response function. These results provide a maximally tractable limiting case that complements and extends previous results obtained in the integrate and fire framework
Noise Suppression and Surplus Synchrony by Coincidence Detection
The functional significance of correlations between action potentials of
neurons is still a matter of vivid debates. In particular it is presently
unclear how much synchrony is caused by afferent synchronized events and how
much is intrinsic due to the connectivity structure of cortex. The available
analytical approaches based on the diffusion approximation do not allow to
model spike synchrony, preventing a thorough analysis. Here we theoretically
investigate to what extent common synaptic afferents and synchronized inputs
each contribute to closely time-locked spiking activity of pairs of neurons. We
employ direct simulation and extend earlier analytical methods based on the
diffusion approximation to pulse-coupling, allowing us to introduce precisely
timed correlations in the spiking activity of the synaptic afferents. We
investigate the transmission of correlated synaptic input currents by pairs of
integrate-and-fire model neurons, so that the same input covariance can be
realized by common inputs or by spiking synchrony. We identify two distinct
regimes: In the limit of low correlation linear perturbation theory accurately
determines the correlation transmission coefficient, which is typically smaller
than unity, but increases sensitively even for weakly synchronous inputs. In
the limit of high afferent correlation, in the presence of synchrony a
qualitatively new picture arises. As the non-linear neuronal response becomes
dominant, the output correlation becomes higher than the total correlation in
the input. This transmission coefficient larger unity is a direct consequence
of non-linear neural processing in the presence of noise, elucidating how
synchrony-coded signals benefit from these generic properties present in
cortical networks
Competition and fragmentation: a simple model generating lognormal-like distributions
The current distribution of language size in terms of speaker population is
generally described using a lognormal distribution. Analyzing the original real
data we show how the double-Pareto lognormal distribution can give an
alternative fit that indicates the existence of a power law tail. A simple
Monte Carlo model is constructed based on the processes of competition and
fragmentation. The results reproduce the power law tails of the real
distribution well and give better results for a poorly connected topology of
interactions.Comment: 14 pages, 11 figure
The location of the axon initial segment affects the bandwidth of spike initiation dynamics
The dynamics and the sharp onset of action potential (AP) generation have recently been the subject of intense experimental and theoretical investigations. According to the resistive coupling theory, an electrotonic interplay between the site of AP initiation in the axon and the somato-dendritic load determines the AP waveform. This phenomenon not only alters the shape of AP recorded at the soma, but also determines the dynamics of excitability across a variety of time scales. Supporting this statement, here we generalize a previous numerical study and extend it to the quantification of the input-output gain of the neuronal dynamical response. We consider three classes of multicompartmental mathematical models, ranging from ball-and-stick simplified descriptions of neuronal excitability to 3D-reconstructed biophysical models of excitatory neurons of rodent and human cortical tissue. For each model, we demonstrate that increasing the distance between the axonal site of AP initiation and the soma markedly increases the bandwidth of neuronal response properties. We finally consider the Liquid State Machine paradigm, exploring the impact of altering the site of AP initiation at the level of a neuronal population, and demonstrate that an optimal distance exists to boost the computational performance of the network in a simple classification task. Copyright
How Structure Determines Correlations in Neuronal Networks
Networks are becoming a ubiquitous metaphor for the understanding of complex biological systems, spanning the range between molecular signalling pathways, neural networks in the brain, and interacting species in a food web. In many models, we face an intricate interplay between the topology of the network and the dynamics of the system, which is generally very hard to disentangle. A dynamical feature that has been subject of intense research in various fields are correlations between the noisy activity of nodes in a network. We consider a class of systems, where discrete signals are sent along the links of the network. Such systems are of particular relevance in neuroscience, because they provide models for networks of neurons that use action potentials for communication. We study correlations in dynamic networks with arbitrary topology, assuming linear pulse coupling. With our novel approach, we are able to understand in detail how specific structural motifs affect pairwise correlations. Based on a power series decomposition of the covariance matrix, we describe the conditions under which very indirect interactions will have a pronounced effect on correlations and population dynamics. In random networks, we find that indirect interactions may lead to a broad distribution of activation levels with low average but highly variable correlations. This phenomenon is even more pronounced in networks with distance dependent connectivity. In contrast, networks with highly connected hubs or patchy connections often exhibit strong average correlations. Our results are particularly relevant in view of new experimental techniques that enable the parallel recording of spiking activity from a large number of neurons, an appropriate interpretation of which is hampered by the currently limited understanding of structure-dynamics relations in complex networks
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