A coincidence detector neural network model of selective attention
... In addition to influence from top-down spatial goals, the neural activation of each stimulus is progressively modulated by top-down signals of semantic information. We propose that a correlation control mechanism that includes coincidence detector neurons determines the correlation between semantic ...
... In addition to influence from top-down spatial goals, the neural activation of each stimulus is progressively modulated by top-down signals of semantic information. We propose that a correlation control mechanism that includes coincidence detector neurons determines the correlation between semantic ...
BETA ACTIVITY: A CARRIER FOR VISUAL ATTENTION
... recorded from occipital electrodes of subjects perceiving patterned visual stimuli (Giannitrapani 1971, Fig. 4B, V. Stein et al. 1993). Such confusing results can be explained by the assumption that visual processing organizes cortical activity into specific spatial pattern replacing the global sync ...
... recorded from occipital electrodes of subjects perceiving patterned visual stimuli (Giannitrapani 1971, Fig. 4B, V. Stein et al. 1993). Such confusing results can be explained by the assumption that visual processing organizes cortical activity into specific spatial pattern replacing the global sync ...
Meaningful auditory information enhances perception of visual
... if auditory and visual signals integrate in the perception of a form of audiovisual “biological motion”: tap dancing. The first experiment showed that a non-informative audio sequence can facilitate the recognition of visual tap dance sequences, provided that the taps are in synchrony with the visua ...
... if auditory and visual signals integrate in the perception of a form of audiovisual “biological motion”: tap dancing. The first experiment showed that a non-informative audio sequence can facilitate the recognition of visual tap dance sequences, provided that the taps are in synchrony with the visua ...
A non-invasive method to relate the timing of neural activity to white
... pseudorandom sequence of prosaccade, antisaccade, and fixation trials. Prosaccade trials required participants to make a saccade to a suddenly appearing visual stimulus, and antisaccade trials required participants to make a saccade in the opposite direction, to a stimulus that remained on the screen ...
... pseudorandom sequence of prosaccade, antisaccade, and fixation trials. Prosaccade trials required participants to make a saccade to a suddenly appearing visual stimulus, and antisaccade trials required participants to make a saccade in the opposite direction, to a stimulus that remained on the screen ...
Gaze direction controls response gain in primary visual
... cortical areas1±12, but the role of the primary visual cortex (area V1) in this process has remained unclear. Here we show that, for half the cells recorded in area V1 of behaving monkeys, the classically described visual responses are strongly modulated by gaze direction. Speci®cally, we ®nd that s ...
... cortical areas1±12, but the role of the primary visual cortex (area V1) in this process has remained unclear. Here we show that, for half the cells recorded in area V1 of behaving monkeys, the classically described visual responses are strongly modulated by gaze direction. Speci®cally, we ®nd that s ...
Human Lateral Geniculate Nucleus and Visual Cortex Respond to
... Seizures provoked by video games or television viewing are commonly experienced by photosensitive epileptic patients.1 The visual attributes eliciting these seizures, for example, the video-screen flicker, are not always consciously perceived. In fact, many events processed by the human brain are no ...
... Seizures provoked by video games or television viewing are commonly experienced by photosensitive epileptic patients.1 The visual attributes eliciting these seizures, for example, the video-screen flicker, are not always consciously perceived. In fact, many events processed by the human brain are no ...
Article Page 08.27.20+
... It is tempting to view this progression of visual information down the various pathways as just that—a progression of information in discreet and sequential stages, each new stage building upon or adding to information from the previous stage. However, this is not how our system works. In general, o ...
... It is tempting to view this progression of visual information down the various pathways as just that—a progression of information in discreet and sequential stages, each new stage building upon or adding to information from the previous stage. However, this is not how our system works. In general, o ...
Neural correlates of decision processes
... movements and has nothing to do with the context in which those movements are expressed. Second, a series of studies has investigated how the time of target selection during visual search by neurons in the FEF relates to RT [23,37]. If the target was easily discriminated from distractors, the time ...
... movements and has nothing to do with the context in which those movements are expressed. Second, a series of studies has investigated how the time of target selection during visual search by neurons in the FEF relates to RT [23,37]. If the target was easily discriminated from distractors, the time ...
Acoustical Vision of Neglected Stimuli: Interaction among Spatially
... separate modality (vision). In neglect patients, a sound presented at the same position (or at close disparity) as a visual stimulus influenced detection of previously neglected visual targets. Before going on to understand the implications of this finding in a context of a cross-modal interaction ...
... separate modality (vision). In neglect patients, a sound presented at the same position (or at close disparity) as a visual stimulus influenced detection of previously neglected visual targets. Before going on to understand the implications of this finding in a context of a cross-modal interaction ...
Why light
... Layers 1 & 2 probably carry information about movement, location. Layers 3, 4, 5, & 6 probably carry information about form and color. Buy why 4 layers for form and color. My guess is that there’s a finer “breakdown” of the layers into 3&4 and 5&6. It is not yet known precisely what the differences ...
... Layers 1 & 2 probably carry information about movement, location. Layers 3, 4, 5, & 6 probably carry information about form and color. Buy why 4 layers for form and color. My guess is that there’s a finer “breakdown” of the layers into 3&4 and 5&6. It is not yet known precisely what the differences ...
Background Presentation
... • A reliable measure of attention is eye movement during object (target) selection • Early studies show that there are specific brain regions that are involved in the process of target selection – Superior Colliculus – Frontal Eye Field – Extrastriate Areas (V1, V4, IT) ...
... • A reliable measure of attention is eye movement during object (target) selection • Early studies show that there are specific brain regions that are involved in the process of target selection – Superior Colliculus – Frontal Eye Field – Extrastriate Areas (V1, V4, IT) ...
Neural Plasticity Workshop: Insights from
... The extraordinary capacity of the brain for functional and structural reorganisation is known as neural plasticity. Understanding this phenomenon not only provides insights into the capabilities of the brain, but also into its potential for adaptation and enhancement, with applications for sensorimo ...
... The extraordinary capacity of the brain for functional and structural reorganisation is known as neural plasticity. Understanding this phenomenon not only provides insights into the capabilities of the brain, but also into its potential for adaptation and enhancement, with applications for sensorimo ...
Visual Dysfunction in Brain Injury
... Visual-perceptual processing dysfunction • Visual-Motor Integration - Eye-hand, eye-foot, and eyebody coordination • Visual-Auditory Integration - The ability to relate and associate what is seen and heard • Visual Memory - The ability to remember and recall information that is seen • Visual Closur ...
... Visual-perceptual processing dysfunction • Visual-Motor Integration - Eye-hand, eye-foot, and eyebody coordination • Visual-Auditory Integration - The ability to relate and associate what is seen and heard • Visual Memory - The ability to remember and recall information that is seen • Visual Closur ...
The Binding Problem
... system. Stereotyped, frequently occurring conjunctions are represented by specific binding units, because this strategy is faster and less susceptible to binding errors. However, because there are not enough neurons to exhaust the whole combinatorial space, population codes provide a possibility to ...
... system. Stereotyped, frequently occurring conjunctions are represented by specific binding units, because this strategy is faster and less susceptible to binding errors. However, because there are not enough neurons to exhaust the whole combinatorial space, population codes provide a possibility to ...
The ABCs of VEPs and ERGs Visual Testing Systems Clinical
... profile analysis Optic cup depth is moderate Clinically significant asymmetry between the eyes ...
... profile analysis Optic cup depth is moderate Clinically significant asymmetry between the eyes ...
III
... midbrain. The efferent pathway is in the oculomotor nerve: parasympathetic fibers from the accessory oculomotor nucleus (E-W nucleus), synapsing in the ciliary ganglion, and supplying the sphincter pupillae. Because of contralateral connections, exposure of only one eye to light causes constriction ...
... midbrain. The efferent pathway is in the oculomotor nerve: parasympathetic fibers from the accessory oculomotor nucleus (E-W nucleus), synapsing in the ciliary ganglion, and supplying the sphincter pupillae. Because of contralateral connections, exposure of only one eye to light causes constriction ...
Decoding the Contents of Visual Short
... identified two brain regions where local patterns of fMRI signals represented the remembered content. Apart from the previously established storage in visual areas, we also discovered an area in the posterior parietal cortex where activity patterns allowed us to decode the specific stimuli held in m ...
... identified two brain regions where local patterns of fMRI signals represented the remembered content. Apart from the previously established storage in visual areas, we also discovered an area in the posterior parietal cortex where activity patterns allowed us to decode the specific stimuli held in m ...
TalkHumaine_grandjean
... Apparently time is less important in the generation of responses of the multimodal neurons than spatial occurrences. The amplitude of the increase of response decreases with the increase of asynchrony. The maximum of responses is related to the overlap of pattern activity through the time (binding p ...
... Apparently time is less important in the generation of responses of the multimodal neurons than spatial occurrences. The amplitude of the increase of response decreases with the increase of asynchrony. The maximum of responses is related to the overlap of pattern activity through the time (binding p ...
Binding Mechanisms in Visual Perception
... When visual information is transmitted through the visual pathway, each object actives a population of neurons (Ghose and Maunsell, 1999). Every neuron among this population are activated by certain object features, such as color, brightness, orientation, motion, spatial location, and so on. For exa ...
... When visual information is transmitted through the visual pathway, each object actives a population of neurons (Ghose and Maunsell, 1999). Every neuron among this population are activated by certain object features, such as color, brightness, orientation, motion, spatial location, and so on. For exa ...
lecture9
... moved his eyes and head the world did not move around so much. He began to feel as though his left hand was on the right, and his right hand on the left. If this new location of his body was vivid, the world appeared right side up, but sometimes he felt his body was upside down in a visually right-s ...
... moved his eyes and head the world did not move around so much. He began to feel as though his left hand was on the right, and his right hand on the left. If this new location of his body was vivid, the world appeared right side up, but sometimes he felt his body was upside down in a visually right-s ...
lgn - cinpla
... feedback from the visual cortex. One would therefore expect the LGN to be more heavily influenced by visual cortex and the response not so similar to the input from retina. The role of this massive feedback has not been clearly identified, and the functional role of the LGN is therefore poorly under ...
... feedback from the visual cortex. One would therefore expect the LGN to be more heavily influenced by visual cortex and the response not so similar to the input from retina. The role of this massive feedback has not been clearly identified, and the functional role of the LGN is therefore poorly under ...
Visual Field Defects - Northwestern Medical Review
... however, true of the visual system. Unilateral damage to the visual cortex is manifested by characteristic partial loss of vision in both eyes. Neither of the eyes is able to see the contralateral visual field with respect to the location of lesions. As we will see later this unique pattern also hol ...
... however, true of the visual system. Unilateral damage to the visual cortex is manifested by characteristic partial loss of vision in both eyes. Neither of the eyes is able to see the contralateral visual field with respect to the location of lesions. As we will see later this unique pattern also hol ...
The Visual Perception System
... psychological factors that are unique to each individual. Incomplete stimuli might result in educated guesses using existing knowledge, involving cognitive processes (memory and problem solving) and the use of perceptual principles (such as knowing the object wont change its physical size when it is ...
... psychological factors that are unique to each individual. Incomplete stimuli might result in educated guesses using existing knowledge, involving cognitive processes (memory and problem solving) and the use of perceptual principles (such as knowing the object wont change its physical size when it is ...
Finding a face in the crowd: parallel and serial neural mechanisms
... stimulus outside the RF. More specifically, the response to an unselected RF stimulus with the neuron’s preferred or nonpreferred color was compared on trials during which the cue was of the preferred or nonpreferred color for the neuron (Fig. 2A). When a stimulus of the preferred color was in the RF ...
... stimulus outside the RF. More specifically, the response to an unselected RF stimulus with the neuron’s preferred or nonpreferred color was compared on trials during which the cue was of the preferred or nonpreferred color for the neuron (Fig. 2A). When a stimulus of the preferred color was in the RF ...
Slide 1 - Elsevier Store
... stimulation did not activate the frontal or parietal cortex reliably when attention was directed elsewhere in the visual field. (B) When the subject directed attention to a peripheral target location and performed an object discrimination task, a distributed frontoparietal network was activated, inc ...
... stimulation did not activate the frontal or parietal cortex reliably when attention was directed elsewhere in the visual field. (B) When the subject directed attention to a peripheral target location and performed an object discrimination task, a distributed frontoparietal network was activated, inc ...
P200
In neuroscience, the visual P200 or P2 is a waveform component or feature of the event-related potential (ERP) measured at the human scalp. Like other potential changes measurable from the scalp, this effect is believed to reflect the post-synaptic activity of a specific neural process. The P2 component, also known as the P200, is so named because it is a positive going electrical potential that peaks at about 200 milliseconds (varying between about 150 and 275 ms) after the onset of some external stimulus . The distribution of this component in the brain, as measured by electrodes placed across the scalp, is located around the centro-frontal and the parieto-occipital region. It is generally found to be maximal around the vertex (frontal region) of the scalp, however there have been some topographical differences noted in ERP studies of the P2 in different experimental conditions.Research on the visual P2 is at an early stage compared to other more established ERP components and there is much that we still do not know about it. Part of the difficulty of clearly characterizing this component is that it appears to be modulated by a large and diverse number of cognitive tasks. Functionally, there seems to be partial agreement amongst researchers in the field of cognitive neuroscience that the P2 represents some aspect of higher-order perceptual processing, modulated by attention. It is known that the P2 is typically elicited as part of the normal response to visual stimuli and has been studied in relation to visual search and attention, language context information, and memory and repetition effects. The amplitude of the peak of the waveform may be modulated by many different aspects of visual stimuli, which allow it to be used for studies of visual cognition and disease. In general, the P2 may be a part of cognitive matching system that compares sensory inputs with stored memory.