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In this paper we present reaction-diffusion based two eye model to develop disparity selective binocular simple cell receptive fields (RFs) in layer IV of cat visual cortex (V1). Pre-eye opening environment is used for development of binocular simple cell RFs. Our model also supports post-eye opening period development of binocular simple cell RFs. Developed binocular simple cells, left and right...
Traditionally, the modeling of sensory neurons has focused on the characterization and/or the learning of input-output relations. Motivated by the view that different neurons impose different partitions on the stimulus space, we propose instead to learn the structure of the stimulus space, as imposed by the cell, by learning a cell specific distance function or kernel. Metaphorically speaking, this...
Concerted firing is one of the important ways for neurons to encode sensory stimuli. In the present study, we investigated dynamic concerted activities among retinal ganglion cells (RGCs) in response to natural movie and pseudo-random checkerboard flicking stimuli. The results showed that concerted activity patterns among RGCs changed dynamically during both stimuli, which were represented by the...
Electroencephalograph has been used in some Environment Control System to help severe disabled people to improve their quality of life. This paper studied the difference of correlation dimension of alpha wave between eye opening and eye closure and proposed a method to control device on and off using correlation dimension of alpha wave. By modifying Grassberger and Procaccia method, the correlation...
Event-related potentials (ERPs) are one of the most informative and dynamic methods of monitoring cognitive processes, which are widely used in clinical research to deal a variety of psychiatric and neurological disorders as attention-deficit/hyperactivity disorder (ADHD). This work proposes an extraction and selection methodology for discriminating between normal and pathological patients with ADHD...
In a partial report paradigm, subjects observe during a brief presentation a cluttered field and after some time - typically ranging from 100 ms to a second - are asked to report a subset of the presented elements. A vast buffer of information is transiently available to be broadcasted which, if not retrieved in time, fades rapidly without reaching consciousness. An interesting feature of this experiment...
This work proposes a clustering technique to analyze evoked potential signals. The proposed method uses an orthogonal subspace model to enhance the single-trial signals of a session and simultaneously a subspace measure to group the trials into clusters. The ensemble averages of the signals of the different clusters are compared with ensemble averages of visually selected trials which are free of...
Transient Visual Evoked Potential (TVEP) is an important diagnostic test for specific ophthalmologic and neurological disorders. Normally the procedure time to perform TVEP takes about 30 to 60 minutes. In order to reduce the procedure time, we use to go for higher rate to stimulation. In this paper we present the comparative study on effect of rate of stimulation on TVEP using Magnitude and Phase...
Convergence insufficiency is a vision dysfunction in which people have difficulties performing visual tasks close to them such as reading. Symptoms include headaches, eye strain, blurred and double vision, and visual fatigue. Four subjects participated in 18 hours of vision rehabilitation consisting of home and laboratory sessions. During a longitudinal study, subjects performed a simple vergence...
We present a novel approach to analyse and model psycho-physiological body activation patterns that emerge from physical and mental activity during daily routines. We analyse our approach on a 62 h dataset of daily routine recordings using acceleration and heart rate sensors. We present a descriptive analysis of psycho-physiological activations during the routines using a novel visualisation technique...
The geometrical organization of a visual sensor is of major importance for the later processing of sensed stimuli. We present an approach to evolve artificial visual detectors which adapt their size and orientation according to the experienced sensory stimulation. The criterion for the introduced optimization method is given by a Reichardt correlation measure on the input signal. Under the described...
A measure known as inspection time (IT) has been shown to account for approximately 25% of the variance in peoples' intellectual abilities, as measured by IQ. Despite this strong relationship, inspection time has had only limited success in expanding our knowledge regarding the nature of intelligence, which can be attributed to a lack of understanding of the neurophysiology underlying IT. In the present...
This paper investigates the relations between ERP features and visual sustained attention. Continuous Performance Test is used for determining sustained attention level. Fifty eight features were extracted from the 19-channel recorded signals. Twenty four subjects were divided into three classes according to their attention level. LDA classifier is used and high accuracy (94%, 88% and 93% for each...
Engineering analysis has been utilized with great success over the past few decades to characterize physiological systems. For example, system identification approaches have been developed to describe the linear and nonlinear properties of such systems in a very general way, allowing for new insights to be made into physiological function. Recent work has seen the application of these techniques to...
The present study investigated the feasibility of acquiring electroencephalography (EEG) data during self-motion in human subjects. Subjects performed a visual oddball task - designed to evoke a P3 event-related potential - while being passively moved in the fore-aft direction on a Stewart platform. The results of this study indicate that reliable EEG data can be obtained during self-motion on a Stewart...
We investigated neural correlates of target detection in the electroencephalogram (EEG) during a free viewing search task and analyzed signals locked to saccadic events. Subjects performed a search task for multiple random scenes while we simultaneously recorded 64 channels of EEG and tracked subjects eye position. For each subject we identified target saccades (TS) and distractor saccades (DS). We...
We propose a model that describes the interaction of several brain regions based on functional magnetic resonance imaging (FMRI) time series to make inferences about functional integration and segregation within the human brain. The method is demonstrated using dynamic causal modeling (DCM) using real data to show how such models are able to characterize interregional dependence. We extend estimating...
The visual and auditory map alignment in the superior colliculus of barn owl is important for its accurate localization in prey behavior. This alignment may be disturbed by the blindness or prism wearing, the juvenile barn owl could adapt its auditory map to this mismatch after several weeks training. It is believed in literature that auditory map with the plasticity shifts in terms of the visual...
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