Visual Information Transfer using Mobile IT Solutions

2009 ◽  
Author(s):  
O.O. Koseoglu ◽  
B. Erdogan ◽  
Y. Nielsen ◽  
C.J. Anumba ◽  
N.M. Bouchlaghem
Keyword(s):  
Visual Information ◽  
Information Transfer

scholarly journals Visual information transfer across eye movements in the monkey

2004 ◽  
Vol 44 (25) ◽  
pp. 2901-2917 ◽  
Author(s):  
Paul S. Khayat ◽  
Henk Spekreijse ◽  
Pieter R. Roelfsema
Keyword(s):  
Eye Movements ◽  
Visual Information ◽  
Information Transfer

Effects of Multiplicative Power Law Neural Noise in Visual Information Processing

2011 ◽  
Vol 23 (4) ◽  
pp. 1015-1046 ◽  
Author(s):  
José M. Medina
Keyword(s):  
Power Law ◽  
Visual Information ◽  
Information Transfer ◽  
Channel Model ◽  
Internal Noise ◽  
Minimum Information ◽  
Information Theoretic ◽  
Neural Noise ◽  
Weakly Coupled ◽  
Transfer Of Information

The human visual system is intrinsically noisy. The benefits of internal noise as part of visual code are controversial. Here the information-theoretic properties of multiplicative (i.e. signal-dependent) neural noise are investigated. A quasi-linear communication channel model is presented. The model shows that multiplicative power law neural noise promotes the minimum information transfer after efficient coding. It is demonstrated that Weber's law and the human contrast sensitivity function arise on the basis of minimum transfer of information and power law neural noise. The implications of minimum information transfer in self-organized neural networks and weakly coupled neurons are discussed.

Excitatory Actions of Dopamine Via D1-Like Receptors in the Rat Lateral Geniculate Nucleus

2005 ◽  
Vol 94 (6) ◽  
pp. 3708-3718 ◽  
Author(s):  
G. Govindaiah ◽  
Charles L. Cox
Keyword(s):  
Visual Information ◽  
Information Transfer ◽  
Neuronal Excitability ◽  
Slow Wave Sleep ◽  
Membrane Depolarization ◽  
Dopamine Receptor Agonist ◽  
Cation Current ◽  
Cell Recording ◽  
Specific Antagonist ◽  
Relay Neurons

The excitability of relay neurons in the dorsal geniculate nucleus (dLGN) can be altered by a variety of neuromodulators. The dLGN receives substantial dopaminergic input from the brain stem, and this innervation may play a crucial role in the gating of visual information from the retina to visual neocortex. In this study, we investigated the action of dopamine on identified dLGN neurons using whole cell recording techniques. Dopamine (2–200 μM) produced a membrane depolarization in >95% of relay neurons tested but did not alter excitability of dLGN interneurons. The D1-like dopamine receptor agonist SKF38393 (2–50 μM) produced a similar depolarization in dLGN relay neurons. However, the D2-like receptor agonists, bromocriptine (25–50 μM) and PPHT (1–50 μM), did not alter the membrane potential of relay neurons. SCH23390 (5–10 μM), a D1-like receptor antagonist, attenuated the depolarizing actions of both dopamine and SKF38393 . Furthermore, the excitatory actions of dopamine and SKF38393 were attenuated by ZD7288, a specific antagonist for the hyperpolarization activated mixed cation current, Ih. Our data suggest that dopamine, acting via D1-like receptors, activates Ih leading to a membrane depolarization. Through the modulation of dLGN neuronal excitability, ascending and descending activating systems may not only control the state of the thalamus such as the transition from slow-wave sleep to waking but also regulate the efficacy of information transfer during waking states.

Altered neuronal activity in the visual processing region of eye-fluke-infected fish

Parasitology ◽  
2020 ◽  
pp. 1-7
Author(s):  
Anthony Stumbo ◽  
Robert Poulin ◽  
Brandon Ruehle
Keyword(s):  
Visual Processing ◽  
Visual Information ◽  
Predator Avoidance ◽  
Information Transfer ◽  
External Environment ◽  
Sensory System ◽  
Infected Fish ◽  
Neuron Activation ◽  
Eye Fluke ◽  
Gobiomorphus Cotidianus

Abstract Fish, like most vertebrates, are dependent on vision to varying degrees for a variety of behaviours such as predator avoidance and foraging. Disruption of this key sensory system therefore should have some impact on the ability of fish to execute these tasks. Eye-flukes, such as Tylodelphys darbyi, often infect fish where they are known to inflict varying degrees of visual impairment. In New Zealand, T. darbyi infects the eyes of Gobiomorphus cotidianus, a freshwater fish, where it resides in the vitreous chamber between the lens and retina. Here, we investigate whether the presence of the parasite in the eye has an impact on neuronal information transfer using the c-Fos gene as a proxy for neuron activation. We hypothesized that the parasite would reduce visual information entering the eye and therefore result in lower c-Fos expression. Interestingly, however, c-Fos expression increased with T. darbyi intensity when fish were exposed to flashes of light. Our results suggest a mechanism for parasite-induced visual disruption when no obvious pathology is caused by infection. The more T. darbyi present the more visual stimuli the fish is presented with, and as such may experience difficulties in distinguishing various features of its external environment.

Research on Visual Cortex Prosthesis System and Visual Information Coding Strategy Based on Sustainable Materials

2013 ◽  
Vol 340 ◽  
pp. 339-343
Author(s):  
Heng Zhang ◽  
Jie Wang
Keyword(s):  
Visual Cortex ◽  
Visual System ◽  
Visual Information ◽  
Information Transfer ◽  
Sensory System ◽  
Information Coding ◽  
Response Characteristics ◽  
Coding Strategy ◽  
Sustainable Materials ◽  
Representation Method

The visual system is human know the important sensory system of the external world, due to a variety of diseases or other injury, leading to the increasing number of blind visual loss, the visual cortex prosthesis research is expected to provide a way of blind sight. Based on unique information transfer mechanism of the biological visual system, the visual cortex prosthesis framework is designed, and for the core module of the prosthesis, it is proposed based on the simple cell selective characteristics of visual system, sparse response characteristics, synchronous oscillations and other image information coding strategy of the mechanism. The algorithm is used for the actual image analysis, to compared with conventional sparse representation method, under the prerequisite of assuring image quality, the strategy can be used as little as possible neuronal to characterize the important information of natural images, thus effectively reducing the prosthesis embedded cortex stimulation electrode quantity, to achieve better information transfer effect.

scholarly journals The directional flow of visual information transfer between pedestrians

2012 ◽  
Vol 8 (4) ◽  
pp. 520-522 ◽  
Author(s):  
Andrew C. Gallup ◽  
Andrew Chong ◽  
Iain D. Couzin
Keyword(s):  
Visual Information ◽  
Information Transfer ◽  
Visual Cues ◽  
Relevant Information ◽  
Gaze Following ◽  
Laboratory Research ◽  
Visual Orientation ◽  
Group Interactions ◽  
Social Species ◽  
Natural Settings

Close behavioural coupling of visual orientation may provide a range of adaptive benefits to social species. In order to investigate the natural properties of gaze-following between pedestrians, we displayed an attractive stimulus in a frequently trafficked corridor within which a hidden camera was placed to detect directed gaze from passers-by. The presence of visual cues towards the stimulus by nearby pedestrians increased the probability of passers-by looking as well. In contrast to cueing paradigms used for laboratory research, however, we found that individuals were more responsive to changes in the visual orientation of those walking in the same direction in front of them (i.e. viewing head direction from behind). In fact, visual attention towards the stimulus diminished when oncoming pedestrians had previously looked. Information was therefore transferred more effectively behind, rather than in front of, gaze cues. Further analyses show that neither crowding nor group interactions were driving these effects, suggesting that, within natural settings gaze-following is strongly mediated by social interaction and facilitates acquisition of environmentally relevant information.

Auditory-visual information transfer in echolocating Egyptian fruit bats

2016 ◽  
Vol 140 (4) ◽  
pp. 2973-2973
Author(s):  
Corinna Schilling ◽  
Alan Grinnell ◽  
Walter Metzner
Keyword(s):  
Visual Information ◽  
Information Transfer ◽  
Fruit Bats

scholarly journals An image-computable model for the stimulus selectivity of gamma oscillations

2019 ◽  
Author(s):  
Dora Hermes ◽  
Natalia Petridou ◽  
Kendrick Kay ◽  
Jonathan Winawer
Keyword(s):  
Visual Cortex ◽  
Visual Information ◽  
Information Transfer ◽  
Gain Control ◽  
Gamma Oscillations ◽  
Small Subset ◽  
Computable Model ◽  
Human Visual Cortex ◽  
Fundamental Mechanism

AbstractGamma oscillations in visual cortex have been hypothesized to be critical for perception, cognition, and information transfer. However, observations of these oscillations in visual cortex vary widely; some studies report little to no stimulus-induced narrowband gamma oscillations, others report oscillations for only some stimuli, and yet others report large oscillations for most stimuli. To reconcile these findings and better understand this signal, we developed a model that predicts gamma responses for arbitrary images and validated this model on electrocorticography (ECoG) data from human visual cortex. The model computes variance across the outputs of spatially pooled orientation channels, and accurately predicts gamma amplitude across 86 images. Gamma responses were large for a small subset of stimuli, differing dramatically from fMRI and ECoG broadband (non-oscillatory) responses. We suggest that gamma oscillations in visual cortex serve as a biomarker of gain control rather than being a fundamental mechanism for communicating visual information.

Sign in / Sign up

Export Citation Format

Share Document