David Hunter Hubel. 27 February 1926 — 22 September 2013
... Subsequent work in the cat showed a continued modification of receptive field organization in the visual areas just beyond the primary visual cortex, and in at least one visual area beyond those. David and Torsten then largely switched to studying the monkey, first going back to the lateral genicula ...
... Subsequent work in the cat showed a continued modification of receptive field organization in the visual areas just beyond the primary visual cortex, and in at least one visual area beyond those. David and Torsten then largely switched to studying the monkey, first going back to the lateral genicula ...
A coincidence detector neural network model of selective attention
... with only some of their physical characteristics being registered. These stimuli are therefore discarded prior to any semantic analysis. On the other hand, late-selection theories (Deutsch & Deutsch, 1963) have placed selection at a later processing stage. These theories have argued that all stimuli ...
... with only some of their physical characteristics being registered. These stimuli are therefore discarded prior to any semantic analysis. On the other hand, late-selection theories (Deutsch & Deutsch, 1963) have placed selection at a later processing stage. These theories have argued that all stimuli ...
feature analyzers in the brain
... sensory: predator or prey signal ? motor: appropriate behavior opposite responses to stimuli must be fast ...
... sensory: predator or prey signal ? motor: appropriate behavior opposite responses to stimuli must be fast ...
- Stem-cell and Brain Research Institute
... In order to establish the complete pattern of cortical connectivity of area V1, we implemented a quantitative analysis using tracers of optimal sensitivity. We made injections of the retrograde tracers fast blue and diamidino yellow in area V1 subserving central and peripheral visual fields. A major ...
... In order to establish the complete pattern of cortical connectivity of area V1, we implemented a quantitative analysis using tracers of optimal sensitivity. We made injections of the retrograde tracers fast blue and diamidino yellow in area V1 subserving central and peripheral visual fields. A major ...
Magnetoencephalographic Investigation of Human Cortical Area V1
... tion of the M pathway in macaque but was not abolished. Anderson et al. (1995) showed that the reversedmotion illusion in human peripheral vision is consistent with spatial aliasing by the P-ganglion-cell mosaic. The ability of the proposed motion center, V5 (Zeki, 1974; Zeki et al., 1991), to utili ...
... tion of the M pathway in macaque but was not abolished. Anderson et al. (1995) showed that the reversedmotion illusion in human peripheral vision is consistent with spatial aliasing by the P-ganglion-cell mosaic. The ability of the proposed motion center, V5 (Zeki, 1974; Zeki et al., 1991), to utili ...
Visual Fields in Ophthalmology - New York Eye and Ear Infirmary
... • Developed in early 1990's to shorten test time of Humphrey 30-2 • Uses one threshold crossing with 3 dB steps instead of 4-2 staircase • Reduces test time by 30-40%… • but has decreased sensitivity and increased variability! ...
... • Developed in early 1990's to shorten test time of Humphrey 30-2 • Uses one threshold crossing with 3 dB steps instead of 4-2 staircase • Reduces test time by 30-40%… • but has decreased sensitivity and increased variability! ...
different sensory modalities
... weaker (fewer impulses, shorter discharge train duration, lower peak frequencies, lower response reliability) than one stimulus alone • Response depression is less common than enhancement; it depends on some specific properties as spatial inhibition, inhibitory surrounds, inhibitory inputs that are ...
... weaker (fewer impulses, shorter discharge train duration, lower peak frequencies, lower response reliability) than one stimulus alone • Response depression is less common than enhancement; it depends on some specific properties as spatial inhibition, inhibitory surrounds, inhibitory inputs that are ...
A non-invasive method to relate the timing of neural activity to white
... The neurophysiological basis of variability in the latency of evoked neural responses has been of interest for decades. We describe a method to identify white matter pathways that may contribute to inter-individual variability in the timing of neural activity. We investigated the relation of the lat ...
... The neurophysiological basis of variability in the latency of evoked neural responses has been of interest for decades. We describe a method to identify white matter pathways that may contribute to inter-individual variability in the timing of neural activity. We investigated the relation of the lat ...
Some Analogies Between Visual Cortical and Genetic Maps
... are replicas of an ancient gene for a receptor protein. 31 The genes for the red and green receptor proteins are located adjacent to each other on the X chromosome and have a 96% sequence homology.32 Many individuals have up to three slightly different versions of the gene for the green receptor pro ...
... are replicas of an ancient gene for a receptor protein. 31 The genes for the red and green receptor proteins are located adjacent to each other on the X chromosome and have a 96% sequence homology.32 Many individuals have up to three slightly different versions of the gene for the green receptor pro ...
Local Field Potential in the Visual System
... Visual Cortex LFP: Spatial Specificity A pertinent question related to LFP signals is their spatial specificity, reflecting the degree to which they represent local activation within a region of cortex rather than mirroring activation that actually occurs at a distant site. Electrical signals observed ...
... Visual Cortex LFP: Spatial Specificity A pertinent question related to LFP signals is their spatial specificity, reflecting the degree to which they represent local activation within a region of cortex rather than mirroring activation that actually occurs at a distant site. Electrical signals observed ...
PDF
... The sizes of 'event' MURFs were plotted quantitatively using computer control of the visual stimulus and analysis or the acquired spike data. Visual stimuli consisted of square dark stimuli moved systematically, under computer control, across a large television screen. The approximate position of th ...
... The sizes of 'event' MURFs were plotted quantitatively using computer control of the visual stimulus and analysis or the acquired spike data. Visual stimuli consisted of square dark stimuli moved systematically, under computer control, across a large television screen. The approximate position of th ...
mechanisms of visual attention in the human cortex
... stimuli were shown to be a weighted average of the responses to the individual stimuli presented alone. For example, if a single good stimulus elicited a high firing rate and a single poor stimulus elicited a low firing rate, the response to the paired stimuli was reduced compared with that elicited ...
... stimuli were shown to be a weighted average of the responses to the individual stimuli presented alone. For example, if a single good stimulus elicited a high firing rate and a single poor stimulus elicited a low firing rate, the response to the paired stimuli was reduced compared with that elicited ...
Lightweight Authentication Protocol For Smart Dust
... Future studies also involve using this processor as an eye of the robots, which provides tremendous applications ...
... Future studies also involve using this processor as an eye of the robots, which provides tremendous applications ...
BETA ACTIVITY: A CARRIER FOR VISUAL ATTENTION
... the cortical level with gain depending on frequency: oscillations within relevant bands were less damped at subsequent processing levels then others. Our current results show that in the cat, cortico-geniculate feedback has a build-in potentiation mechanism acting at around the beta frequency which ...
... the cortical level with gain depending on frequency: oscillations within relevant bands were less damped at subsequent processing levels then others. Our current results show that in the cat, cortico-geniculate feedback has a build-in potentiation mechanism acting at around the beta frequency which ...
Specialization within the ventral stream: The case for the visual word
... Importantly, such overlap between activations to words, objects and faces does not preclude studying the functional contribution of inferior temporal cortex to reading per se. The issue of the nature of the contribution of a given cortical sector to reading (e.g. Is it case-independent? Is it locati ...
... Importantly, such overlap between activations to words, objects and faces does not preclude studying the functional contribution of inferior temporal cortex to reading per se. The issue of the nature of the contribution of a given cortical sector to reading (e.g. Is it case-independent? Is it locati ...
Contributions of temporal-parietal junction to the human
... patients who could discriminate the stimuli. Further behavioral studies of these same temporal-parietal patients have shown reduced orienting to distracting stimuli 17. Other investigators have reported that patients with anterograde memory deficits due to posterior association cortex or limbic path ...
... patients who could discriminate the stimuli. Further behavioral studies of these same temporal-parietal patients have shown reduced orienting to distracting stimuli 17. Other investigators have reported that patients with anterograde memory deficits due to posterior association cortex or limbic path ...
Erin Hardie
... often depends upon the classification, etiology, and time of diagnosis of the condition; however, it is possible to be neurologically normal and approximately 29% can academically be considered average (7). This explains how our patient lived 31 years without a diagnosis. However, most patients have ...
... often depends upon the classification, etiology, and time of diagnosis of the condition; however, it is possible to be neurologically normal and approximately 29% can academically be considered average (7). This explains how our patient lived 31 years without a diagnosis. However, most patients have ...
Comparison of Quantities: Core and Format
... With respect to the processing of symbolic stimuli, we distinguished between the symbolic representation of positive (e.g., 3) and negative integers (e.g., –3). The latter were introduced as a more abstract level of numerical conceptualization. Even though negative integers have not attracted as muc ...
... With respect to the processing of symbolic stimuli, we distinguished between the symbolic representation of positive (e.g., 3) and negative integers (e.g., –3). The latter were introduced as a more abstract level of numerical conceptualization. Even though negative integers have not attracted as muc ...
Neuronal Interaction Dynamics in Cat Primary Visual Cortex
... glucose in physiological Ringer’s solution was continuously inf used (3 ml / hr; Braun). Heart rate, intratracheal pressure, expired C O2, body temperature, and EEG were monitored during the entire experiment. Respiration was adjusted for an end-tidal C O2 between 3.5 and 4.0%. The body temperature ...
... glucose in physiological Ringer’s solution was continuously inf used (3 ml / hr; Braun). Heart rate, intratracheal pressure, expired C O2, body temperature, and EEG were monitored during the entire experiment. Respiration was adjusted for an end-tidal C O2 between 3.5 and 4.0%. The body temperature ...
Attention maps in the brain - Site BU
... attention is capable of moving as fast as every 200–500 milliseconds (e.g., Refs 57–59), fMRI methods are not ideal for ruling out rapid shifts of spatial attention. Thus, we employed a psychophysical task that excluded the possibility that spatial attention was rapidly switching between locations o ...
... attention is capable of moving as fast as every 200–500 milliseconds (e.g., Refs 57–59), fMRI methods are not ideal for ruling out rapid shifts of spatial attention. Thus, we employed a psychophysical task that excluded the possibility that spatial attention was rapidly switching between locations o ...
Neural Basis of Prosopagnosia: An fMRI Study
... and second harmonics and very low frequencies (1–3 cycles/scan) to remove baseline drift and head motion artifacts. Harmonic frequencies were excluded because any periodic signal that is not perfectly sinusoidal will be expressed by the sum of sine waves at its fundamental frequency and all of its h ...
... and second harmonics and very low frequencies (1–3 cycles/scan) to remove baseline drift and head motion artifacts. Harmonic frequencies were excluded because any periodic signal that is not perfectly sinusoidal will be expressed by the sum of sine waves at its fundamental frequency and all of its h ...
T2 - Center for Neural Basis of Cognition
... Corollary discharge has an impact far back into the system. Remapping implies widespread connectivity in which many neurons have rapid access to information well beyond the classical receptive field. Vision is an active process of building representations. ...
... Corollary discharge has an impact far back into the system. Remapping implies widespread connectivity in which many neurons have rapid access to information well beyond the classical receptive field. Vision is an active process of building representations. ...
WHEN THE visual cortex in the occipital lobe is electrically
... singular, round shape. Following surface stimulation of the left occipital pole at levels as high as 5mA, patient SE reported spontaneous aura-like visual sensations which were different from the small flashing lights associated with his epileptic seizures. We were able to elicit phosphenes by intra ...
... singular, round shape. Following surface stimulation of the left occipital pole at levels as high as 5mA, patient SE reported spontaneous aura-like visual sensations which were different from the small flashing lights associated with his epileptic seizures. We were able to elicit phosphenes by intra ...
E(R) - Consciousness Online
... Uninformative stimuli bring less information but elicit a higher response than the 55% cues. It is not the information per se! It is its utility to the organism. After all, attention MUST be selective! ...
... Uninformative stimuli bring less information but elicit a higher response than the 55% cues. It is not the information per se! It is its utility to the organism. After all, attention MUST be selective! ...
Visual extinction
Visual extinction is a neurological disorder which occurs following damage to the parietal lobe of the brain. It is similar to, but distinct from, hemispatial neglect. Visual extinction has the characteristic symptom of difficulty to perceive contralesional stimuli when presented simultaneously with an ipsilesional stimulus, but the ability to correctly identify them when not presented simultaneously. Under simultaneous presentation, the contralesional stimulus is apparently ignored by the patient, or extinguished. This deficiency may lead to difficulty on behalf of the patient with processing the stimuli’s 3D position.