PSYC550 Sense or Senseless
... – Failure to perceive objects, even though visual acuity is relatively normal. • associative visual agnosia – Inability to identify objects that are perceived visually, even though the form of the perceived object can be drawn or matched with similar objects. • prosopagnosia – Failure to recognize p ...
... – Failure to perceive objects, even though visual acuity is relatively normal. • associative visual agnosia – Inability to identify objects that are perceived visually, even though the form of the perceived object can be drawn or matched with similar objects. • prosopagnosia – Failure to recognize p ...
Neuro-ophthalmology
... Amaurosis Fugax Transient monocular visual loss or dimming May last from 2-3 minutes to 30 minutes or more Due to decrease blood flow to the eye Causes: • Carotid atheroma • Cardiac valvular disease • Atrial myxoma • Retinal migraine • Giant cell arteritis • Hyperviscousity syndromes ...
... Amaurosis Fugax Transient monocular visual loss or dimming May last from 2-3 minutes to 30 minutes or more Due to decrease blood flow to the eye Causes: • Carotid atheroma • Cardiac valvular disease • Atrial myxoma • Retinal migraine • Giant cell arteritis • Hyperviscousity syndromes ...
Lecture 13A
... animals. • It corrects these errors, learning to confine the call to the correct member of each category, and to respond more quickly. • However, even when the vervet produces its first calls, it does not make between-category errors, for example, issue the snake call to a bird, and so on. • That me ...
... animals. • It corrects these errors, learning to confine the call to the correct member of each category, and to respond more quickly. • However, even when the vervet produces its first calls, it does not make between-category errors, for example, issue the snake call to a bird, and so on. • That me ...
Adaptive, behaviorally gated, persistent encoding of task
... sensory stimuli, depending on current task and context, is an essential component of flexible, goal-directed behavior. Neurons in frontal cortex are likely to contribute to this adaptive ability because of their extraordinary flexibility, responding differently to identical stimuli depending on the ...
... sensory stimuli, depending on current task and context, is an essential component of flexible, goal-directed behavior. Neurons in frontal cortex are likely to contribute to this adaptive ability because of their extraordinary flexibility, responding differently to identical stimuli depending on the ...
Visual Coding and the Retinal Receptors
... • Pattern recognition in the cerebral cortex occurs in a few places • The primary visual cortex (area V1) receives information from the lateral geniculate nucleus and is the area responsible for the first stage of visual processing. • Some people with damage to V1 show blindsight, an ability to resp ...
... • Pattern recognition in the cerebral cortex occurs in a few places • The primary visual cortex (area V1) receives information from the lateral geniculate nucleus and is the area responsible for the first stage of visual processing. • Some people with damage to V1 show blindsight, an ability to resp ...
Document
... that guides navigation and skilled movements directed toward objects, and that of the ventral stream is to provide visual information about the size, shape, color, and texture of objects (including, as we shall see, other people). (See Figure 6.34 .) ...
... that guides navigation and skilled movements directed toward objects, and that of the ventral stream is to provide visual information about the size, shape, color, and texture of objects (including, as we shall see, other people). (See Figure 6.34 .) ...
Visual7
... Images in the nasal hemiretina from both sides cross over (temporal stay ipsilateral). This allows for complete cross-over of each visual field (see Fig. 7-3C). ...
... Images in the nasal hemiretina from both sides cross over (temporal stay ipsilateral). This allows for complete cross-over of each visual field (see Fig. 7-3C). ...
Visual Processing - Baby Watch Early Intervention
... • They are able to talk about what and how they see in a way that young children with brain injury can’t. • Brain injury to young children may affect the visual brain in similar ways. • But in the very young child, brain plasticity may help the visual brain rewire to some degree around the lesions. ...
... • They are able to talk about what and how they see in a way that young children with brain injury can’t. • Brain injury to young children may affect the visual brain in similar ways. • But in the very young child, brain plasticity may help the visual brain rewire to some degree around the lesions. ...
Visual Perception
... One solution to these issues was advanced by Gestalt psychology, a school of psychology whose adherents believed that organization is an essential feature of visual perception. They argued that a form is not perceived by somehow summing up all its individual components, but by considering is as a co ...
... One solution to these issues was advanced by Gestalt psychology, a school of psychology whose adherents believed that organization is an essential feature of visual perception. They argued that a form is not perceived by somehow summing up all its individual components, but by considering is as a co ...
Visually Induced Ocular Torsion
... All subjects responded with a torsional movement in the same direction as a static tilted stimulus. The response amplitude was small, only compensating for a minor portion of the stimuli tilt. The response was well conjugate for the right and left eye. In the first study, a visual scene enriched wit ...
... All subjects responded with a torsional movement in the same direction as a static tilted stimulus. The response amplitude was small, only compensating for a minor portion of the stimuli tilt. The response was well conjugate for the right and left eye. In the first study, a visual scene enriched wit ...
Localization of Cognitive Operations
... information on the anatomy involved (5). Our approach relates specific mental operations as developed from cognitive models to neural anatomical areas. The study of reading and listening has been one of the most active areas in cognitive science for the study of internal codes involved in informatio ...
... information on the anatomy involved (5). Our approach relates specific mental operations as developed from cognitive models to neural anatomical areas. The study of reading and listening has been one of the most active areas in cognitive science for the study of internal codes involved in informatio ...
Slide 1 - Elsevier Store
... the experimental setup for optical imaging. Digitized images of a region of visual cortex (as in B) are taken with a CCD camera while the anesthetized, paralyzed animal is viewing a visual stimulus. These images are stored on a second computer for further analysis. (B) Individual image (9 by 6 mm) o ...
... the experimental setup for optical imaging. Digitized images of a region of visual cortex (as in B) are taken with a CCD camera while the anesthetized, paralyzed animal is viewing a visual stimulus. These images are stored on a second computer for further analysis. (B) Individual image (9 by 6 mm) o ...
Now you see it: frontal eye field responses to invisible targets
... Visual signals have been identified in the superior colliculus, but might they also reach the oculomotor nuclei, and if so, what would they do there? The authors also noticed that although most FEF neurons responded strongly to the target under all conditions, the response was larger on trials when ...
... Visual signals have been identified in the superior colliculus, but might they also reach the oculomotor nuclei, and if so, what would they do there? The authors also noticed that although most FEF neurons responded strongly to the target under all conditions, the response was larger on trials when ...
FIGURE LEGENDS FIGURE 46.1 Lateral viewof a human brain
... Visual 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 activat ...
... Visual 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 activat ...
The role of synchronous gamma-band activity in schizophrenia
... exhibit delays of phase synchronization exhibit poor P50 suppression in P50 click paradigm which related to phase-locked in gamma-band activity failed to show good result in backward masking test which related to induced gamma-band activity ...
... exhibit delays of phase synchronization exhibit poor P50 suppression in P50 click paradigm which related to phase-locked in gamma-band activity failed to show good result in backward masking test which related to induced gamma-band activity ...
Chapter One: Neurological Bases for Visual Communication
... and cones, which perceive color (Figure 3). The cells are not distributed evenly. You have more cones near the center or fovea of your retina. The parabolic shape of the retina causes light and images to be most intense at the fovea, and cones operate best here because they need light to see color a ...
... and cones, which perceive color (Figure 3). The cells are not distributed evenly. You have more cones near the center or fovea of your retina. The parabolic shape of the retina causes light and images to be most intense at the fovea, and cones operate best here because they need light to see color a ...
The NTVA framework: Linking Cognition and Neuroscience
... field, the cell may still respond to only a part of the experimental stimulus or to internally generated random noise. In both cases attentional weighting effects are potentially important. A third common effect of attention is an increase in a cell’s baseline firing rate when a target object is exp ...
... field, the cell may still respond to only a part of the experimental stimulus or to internally generated random noise. In both cases attentional weighting effects are potentially important. A third common effect of attention is an increase in a cell’s baseline firing rate when a target object is exp ...
CVI
... Movement cues, especially in the peripheral fields can often stimulate a visual response. Visual interpretation may be improved for some children when they are actually moving as opposed to standing still. Color vision does not seem to be affected. ...
... Movement cues, especially in the peripheral fields can often stimulate a visual response. Visual interpretation may be improved for some children when they are actually moving as opposed to standing still. Color vision does not seem to be affected. ...
VL_CHAPTER_4
... cortex clearly. This movie shows the response measured by fMRI in the visual cortex of a human who was viewing a stimulus. The stimulus shown is a flickering ring with a checkerboard pattern that slowly expanded, moving from the center of vision (the foveal region) to the periphery. Notice that the ...
... cortex clearly. This movie shows the response measured by fMRI in the visual cortex of a human who was viewing a stimulus. The stimulus shown is a flickering ring with a checkerboard pattern that slowly expanded, moving from the center of vision (the foveal region) to the periphery. Notice that the ...
Chapter 6
... Role of the visual association cortex Two streams of visual analysis – Visual info receive from the striate cortex is analyzed in the visual assc cortex – Neurons in the striate cortex project to the extrastriate cortex, which surrounds the visual assc cortex – The primate extrastriate cortex consi ...
... Role of the visual association cortex Two streams of visual analysis – Visual info receive from the striate cortex is analyzed in the visual assc cortex – Neurons in the striate cortex project to the extrastriate cortex, which surrounds the visual assc cortex – The primate extrastriate cortex consi ...
Viktor`s Notes * Visual Pathways and Cortex
... PRIMARY VISUAL CORTEX (V1, area 17, striate cortex) visual cortex has six layers (like rest of neocortex). there are many nerve cells associated with each fiber. magnocellular and parvocellular pathways end in layer 4 (in its deepest part, layer 4C). thick, light-colored layer 4 is visible to ...
... PRIMARY VISUAL CORTEX (V1, area 17, striate cortex) visual cortex has six layers (like rest of neocortex). there are many nerve cells associated with each fiber. magnocellular and parvocellular pathways end in layer 4 (in its deepest part, layer 4C). thick, light-colored layer 4 is visible to ...
lecture9
... 9 months: hand orients prior to contact (note visual information about orientation is available at 2 months). Pre-shape for object size. Still adjusting grip force by 7-8 years (grip force larger for larger objects). Use palmar grasp until about 12 months – then use fingers to grasp. Corresponds to ...
... 9 months: hand orients prior to contact (note visual information about orientation is available at 2 months). Pre-shape for object size. Still adjusting grip force by 7-8 years (grip force larger for larger objects). Use palmar grasp until about 12 months – then use fingers to grasp. Corresponds to ...
P312 Ch05_PerceivingObjectsII
... Grill-Spector (2004) study. Examined activity in the Fusiform Face Area (FFA) in response to presentation of faces. Precisely locate the FFA in each person. Used an approach called the Region-of-Interest approach to identify exactly where the FFA was in each participant. Presented pictures of faces ...
... Grill-Spector (2004) study. Examined activity in the Fusiform Face Area (FFA) in response to presentation of faces. Precisely locate the FFA in each person. Used an approach called the Region-of-Interest approach to identify exactly where the FFA was in each participant. Presented pictures of faces ...
Danczi Csaba László - 2nd WORLD CONGRESS OF ARTS
... deflection of the hairs. Responses are transient, and a sustained response can be elicited only by a stimulus moving continuously across the cutaneous surface (2). The presence of extensive connections between superficial and deep regions of the colliculus in the cat supports the idea that receptive ...
... deflection of the hairs. Responses are transient, and a sustained response can be elicited only by a stimulus moving continuously across the cutaneous surface (2). The presence of extensive connections between superficial and deep regions of the colliculus in the cat supports the idea that receptive ...
Top-down influence in early visual processing: a Bayesian perspective
... certain stimulus as a result of the training, the extrastriate ventral stream might provide a top-down feature (object) expectation (or in Bayesian term, feature prior) to facilitate the processing or detection of that particular stimulus in V1. ...
... certain stimulus as a result of the training, the extrastriate ventral stream might provide a top-down feature (object) expectation (or in Bayesian term, feature prior) to facilitate the processing or detection of that particular stimulus in V1. ...
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.