We have determined an new method for quantifying the nonlinearities of brain imaging data sets to allow comparison of measures of nonlinearity across comparable experiments. We have an efficient algorithm for finding nonlinear features of high dimensional data from variations in two-dimensional...

The main contribution of this research is two-fold: (a) we provide a rigorous substitute for the intuitive regularity observed in visual perception, by appealing to information geometry; and, (b) we provide a set of algorithms for estimating measures of curvilinear invariants of data space...

Information theory provides tools to analyze neural ensembles that do not depend on assumptions of linearity or correlations in the stimulus ensemble. Here, we use a newly derived information theoretic measure, the stimulus-specific information (SSI), to analyze the important stimuli to...

Coupled logistic map lattices can perform object recognition by mapping class members to a point in a space defined by partition cell occupancies, measured at a readout time t for the entire lattice. Each map (unit) represents average spiking dynamics in mixed excitatory-inhbitory neuronal...

We report on behavioral experiments to test a cortical visual prosthesis. 117 iridium electrodes, used for both recording and electrical stimulation, were implanted in V1 of a rhesus monkey. In recording tests, a visual receptive field (corresponding to the combined field of the neurons sampled...

It is known that from a dynamics-systems point of view there are two fundamental classes of spiking neurons: type-I and II. Here we analyse the effect of noise on basic properties of these two classes (f-I-curves, latencies, phase-resetting curves). We also contrast the relative information...

The spinal cord neural circuitry was modeled as a network of interacting neuronal modules (NMs). Each NM includes a network of alpha-motoneurons, Renshaw, Ia and Ib interneurons, and interneurons associated with the central pattern generator (CPG). The CPG was integrated with reflex circuits....

The spinal cord neural circuitry was modeled as a network of interacting neuronal modules (NMs). Each NM includes a network of alpha-motoneurons, Renshaw, Ia and Ib interneurons, and interneurons associated with the central pattern generator (CPG). The CPG was integrated with reflex circuits....

How objects are grouped in the visual field is a fundamental question that has yet to receive a satisfactory answer. Traditional Gestalt principles suggest a number of rules that determine groupings such as proximity, similarity, closure, and common fate. But these rules are misleading, because...

We have developed a neurocomputational model of some attentional effects of nicotine. Our simulations reproduce results showing smoking abstinence to impair performance on a rapid visual information processing task involving detecting sequences of even or odd digits.Our model treats presence of...