Journal ArticleDOI
A neural network model for the development of direction selectivity in the visual cortex
Takashi Nagano,Masaaki Fujiwara +1 more
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TLDR
A neural network model is proposed to explain the development of direction selectivity of cortical cells and found that it results not from the direct convergence of many excitatory inputs from LGN cells but from cortical neural networks.Abstract:
A neural network model is proposed to explain the development of direction selectivity of cortical cells. The model is constructed under the following three hypotheses that are very plausible from recent neurophysiological findings. (1) Direction selectivity is developed by modifiable inhibitory synapses. (2) It results not from the direct convergence of many excitatory inputs from LGN cells but from cortical neural networks. (3) Direction-selective mechanism is independent of orientation-selective mechanism.--The model was simulated on a computer for a few kinds of inhibitory connections and initial conditions. The results were consistent with neurophysiological facts not only for normal cats but for cats reared in an abnormal visual environment.read more
Citations
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A Model of Leg Coordination in the Stick Insect, Carausius morosus – II. Description of the Kinematic Model and Simulation of Normal Step Patterns
TL;DR: An information-processing model of leg control is presented that incorporates the four primary mechanisms of interleg coordination in the stick insect and demonstrates that the four mechanisms produce a stable metachronal coordination and rapidly correct perturbations.
Journal ArticleDOI
Directional sensitivity, invariance and variability of tectal T5 neurons in response to moving configurational stimuli in the toadBufo bufo (L.)
TL;DR: Different configurational visual stimuli traversed, at constant angular velocity, the centers of the receptive fields of single tectal T5 neurons in various directions of thex-y coordinates, indicating that the response property can change, when identical series of stimuli were repeatedly presented over a period of several hours.
Journal ArticleDOI
Spike-based synaptic plasticity and the emergence of direction selective simple cells: simulation results.
Nissim J. Buchs,Walter Senn +1 more
TL;DR: This work shows that the spatial displacement and the appropriate degree of synaptic depression required for DS can develop within an unbiased input scenario by means of temporally asymmetric spike-timing dependent plasticity (STDP) which modifies both the synaptic strength and the degree ofaptic depression.
Journal ArticleDOI
A model of leg coordination in the stick insect, Carausius morosus
TL;DR: In this article, an information-processing model of leg control is presented, which incorporates the four primary mechanisms of interleg coordination in the stick insect and is formulated in terms of kinematic parameters of leg movement.
Journal ArticleDOI
Self stabilization of neuronal networks. I. The compensation algorithm for synaptogenesis
TL;DR: It is concluded that the compensation theory of synaptogenesis can account for the development of morphogenetically stable neuronal networks out of randomly connected networks via selective stabilization and elimination of synapses.
References
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Journal ArticleDOI
Self-organization of orientation sensitive cells in the striata cortex
TL;DR: A nerve net model for the visual cortex of higher vertebrates is presented and a simple learning procedure is shown to be sufficient for the organization of some essential functional properties of single units.
Journal Article
Discourse on one way in which a quantum-mechanics language on the classical logical base can be built up.
Journal ArticleDOI
Visual Experience Modifies Distribution of Horizontally and Vertically Oriented Receptive Fields in Cats
TL;DR: Elongated receptive fields of cells in the visual cortex were horizontally or vertically oriented—no oblique fields were found and units with horizontal fields were activated only by the eye exposed to horizontal lines; units with vertical fieldsonly by the eyes exposed to vertical lines.
Journal ArticleDOI
Cognitron: A self-organizing multilayered neural network
TL;DR: A new hypothesis for the organization of synapses between neurons is proposed: “The synapse from neuron x to neuron y is reinforced when x fires provided that no neuron in the vicinity of y is firing stronger than y”, and a new algorithm with which a multilayered neural network is effectively organized can be deduced.
Journal ArticleDOI
Inhibitory processes underlying the directional specificity of simple, complex and hypercomplex cells in the cat's visual cortex
TL;DR: The iontophoretic application of bicuculline, an antagonist of GABA, the putative inhibitory transmitter in the visual cortex, has been used to examine the contribution of post‐synaptic inhibitory processes to the directional selectivity of simple, complex and hypercomplex cells in the cat's striate cortex.
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