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... all except psychologists and vision scientists who are curious about how, exactly, information in the form of light becomes coded in the brain. Most reading researchers are equally indifferent to what goes on in the visual system – at least, until some aspect of reading goes wrong and language-base ...
... all except psychologists and vision scientists who are curious about how, exactly, information in the form of light becomes coded in the brain. Most reading researchers are equally indifferent to what goes on in the visual system – at least, until some aspect of reading goes wrong and language-base ...
The time course of selective visual attention: theory and experiments
... search time increases linearly with frame size, meaning that a serial process must be involved. On the other hand, in feature search conditions that do not involve ...
... search time increases linearly with frame size, meaning that a serial process must be involved. On the other hand, in feature search conditions that do not involve ...
Task demands determine the specificity of the search template Mary
... observers searched for a line oriented at 55 degrees among lines oriented at 50 degrees. Using a physiologically plausible model, the authors demonstrated that 55and 50-degree lines are best discriminated by a feature detector tuned to 60 degrees. They then showed that observers do indeed use a 60- ...
... observers searched for a line oriented at 55 degrees among lines oriented at 50 degrees. Using a physiologically plausible model, the authors demonstrated that 55and 50-degree lines are best discriminated by a feature detector tuned to 60 degrees. They then showed that observers do indeed use a 60- ...
Response Suppression in V1 Agrees with Psychophysics of
... angle, 55°; field of view (FOV), 220 mm; effective inplane pixel size, 3.2 ⫻ 3.2 mm; 4 mm slice thickness; 12 slices. Slices had an oblique orientation perpendicular to the calcarine sulcus with the most caudal slice tangent to the occipital pole. The slices covered most of the occipital lobe. Each ...
... angle, 55°; field of view (FOV), 220 mm; effective inplane pixel size, 3.2 ⫻ 3.2 mm; 4 mm slice thickness; 12 slices. Slices had an oblique orientation perpendicular to the calcarine sulcus with the most caudal slice tangent to the occipital pole. The slices covered most of the occipital lobe. Each ...
Mechanisms of Visual Attention in the Human Cortex
... paired stimuli was reduced compared with that elicited by the single good stimulus. This result indicates that two stimuli present at the same time within a neuron’s RF are not processed independently, but rather that they interact with each other in a mutually suppressive way. This sensory suppress ...
... paired stimuli was reduced compared with that elicited by the single good stimulus. This result indicates that two stimuli present at the same time within a neuron’s RF are not processed independently, but rather that they interact with each other in a mutually suppressive way. This sensory suppress ...
June 2010 - McPherson Eye Research Institute
... NIH Supports Eye Movement Studies to Understand Selection and Choice Two new grants have been awarded to Michele Basso (Physiology) to explore how the brain makes choices about where to look. Preliminary data collected by graduate student Corinne Vokoun, while supported by an ERI Rapid Response Init ...
... NIH Supports Eye Movement Studies to Understand Selection and Choice Two new grants have been awarded to Michele Basso (Physiology) to explore how the brain makes choices about where to look. Preliminary data collected by graduate student Corinne Vokoun, while supported by an ERI Rapid Response Init ...
PDF preprint - The Computational Neurobiology Laboratory
... pressure on the eyeballs (Tyler, 1978), in “near death” experiences (Blackmore, 1992), and most strikingly, shortly after taking hallucinogens containing ingredients such as LSD, cannabis, mescaline, or psilocybin (Siegel & Jarvik, 1975). The images do not move with the eyes and sometimes are fixed i ...
... pressure on the eyeballs (Tyler, 1978), in “near death” experiences (Blackmore, 1992), and most strikingly, shortly after taking hallucinogens containing ingredients such as LSD, cannabis, mescaline, or psilocybin (Siegel & Jarvik, 1975). The images do not move with the eyes and sometimes are fixed i ...
A multi-level account of selective attention
... with early selection. The main conclusion of these behavioural studies, and many others like them, is that behavioural evidence in support of either early or late selection can be obtained using very similar experimental paradigms. Therefore, in this particular area of cognitive psychology, physiolo ...
... with early selection. The main conclusion of these behavioural studies, and many others like them, is that behavioural evidence in support of either early or late selection can be obtained using very similar experimental paradigms. Therefore, in this particular area of cognitive psychology, physiolo ...
mechanisms of visual attention in the human cortex
... paired stimuli was reduced compared with that elicited by the single good stimulus. This result indicates that two stimuli present at the same time within a neuron’s RF are not processed independently, but rather that they interact with each other in a mutually suppressive way. This sensory suppress ...
... paired stimuli was reduced compared with that elicited by the single good stimulus. This result indicates that two stimuli present at the same time within a neuron’s RF are not processed independently, but rather that they interact with each other in a mutually suppressive way. This sensory suppress ...
Smooth Pursuit Impairment in Schizophrenia— What Does It Mean?
... smooth and free of intruding saccades. The same patients had smooth pursuit impairment when tracking a moving target. Levin et al. (1982a) confirmed this finding and further showed that compensatory VORs made while refixating a target with both head and eyes (head-eye saccades) also appeared normal ...
... smooth and free of intruding saccades. The same patients had smooth pursuit impairment when tracking a moving target. Levin et al. (1982a) confirmed this finding and further showed that compensatory VORs made while refixating a target with both head and eyes (head-eye saccades) also appeared normal ...
Viewpoint - Columbia University
... upon a continual competition between internally generated goals and external distractions. Recently it was shown that single neurons in the macaque lateral intraparietal area (LIP) can predict the amount of time a distractor can shift the locus of spatial attention away from a goal. We propose that ...
... upon a continual competition between internally generated goals and external distractions. Recently it was shown that single neurons in the macaque lateral intraparietal area (LIP) can predict the amount of time a distractor can shift the locus of spatial attention away from a goal. We propose that ...
attention - CMU Graphics
... ❏ features - orientation, color, direction of motion, spatial frequency ❏ intensity - luminance contrast ● play different roles in the bias competition model ● untuned feature - decreases poor stimulus response, ...
... ❏ features - orientation, color, direction of motion, spatial frequency ❏ intensity - luminance contrast ● play different roles in the bias competition model ● untuned feature - decreases poor stimulus response, ...
The Constructive Nature of Visual Processing
... object shape can facilitate the association of visual elements into a unified percept (Figure 25–3). The brain analyzes a visual scene at three levels: low, intermediate, and high (Figure 25–4). At the lowest level, which we consider in the next chapter, visual attributes such as local contrast, ori ...
... object shape can facilitate the association of visual elements into a unified percept (Figure 25–3). The brain analyzes a visual scene at three levels: low, intermediate, and high (Figure 25–4). At the lowest level, which we consider in the next chapter, visual attributes such as local contrast, ori ...
Neuropsychologia, 47, 1621-6
... design. Specifically, participants pointed to visual targets projected onto the glabrous (palm) or hairy (back) side of their actual left hand or onto the palm or back of the fake left hand. The four hand-skin conditions, real-glabrous, real-hairy, fake-glabrous, and fake-hairy, were presented in eig ...
... design. Specifically, participants pointed to visual targets projected onto the glabrous (palm) or hairy (back) side of their actual left hand or onto the palm or back of the fake left hand. The four hand-skin conditions, real-glabrous, real-hairy, fake-glabrous, and fake-hairy, were presented in eig ...
A Dynamic Field Theory of Visual Recognition in Infant Looking... Gregor Schöner Sammy Perone () and John P. Spencer ()
... only difference across simulations was in the distribution of the inputs. Mareschal and colleagues (e.g., Mareschal, French, & Quinn, 2000; French et al., 2004) have extensively examined the role of input distribution in asymmetric categorization and have tested predictions of an autoencoder network ...
... only difference across simulations was in the distribution of the inputs. Mareschal and colleagues (e.g., Mareschal, French, & Quinn, 2000; French et al., 2004) have extensively examined the role of input distribution in asymmetric categorization and have tested predictions of an autoencoder network ...
High-Level Visual Processing: Cognitive Influences
... the object with the memory of other objects or events. Object representations can be stored in working memory and recalled in association with other memories. ...
... the object with the memory of other objects or events. Object representations can be stored in working memory and recalled in association with other memories. ...
A Neurodynamical cortical model of visual attention and
... for all stimulus features: colour, shape, location, etc. This process of feature selection suggests that subjects utilize top–down information (from the feature-based or object memory template) independently of stimulus location in space. The attentional theory of Duncan and Humphreys (1989) propose ...
... for all stimulus features: colour, shape, location, etc. This process of feature selection suggests that subjects utilize top–down information (from the feature-based or object memory template) independently of stimulus location in space. The attentional theory of Duncan and Humphreys (1989) propose ...
Implications on visual apperception: energy, duration
... equilibrium (Qian and Beard, 2005) that make possible to pick up extreme weak different information from the outside world. The sensory systems, which are results of nonlinear biochemical processes of cells, have extreme sensitivity to pick up diverse information from the external world. Blindsight ...
... equilibrium (Qian and Beard, 2005) that make possible to pick up extreme weak different information from the outside world. The sensory systems, which are results of nonlinear biochemical processes of cells, have extreme sensitivity to pick up diverse information from the external world. Blindsight ...
The posterior parietal cortex: Sensorimotor interface for the planning
... a fixed point on the trunk; in Fig. 2 this fixed point is at the right shoulder. We will refer to this representation as ‘body-centered’. As illustrated in Fig. 2, both schemes will arrive at the same motor error (M). However, with either scheme a difficulty arises in assigning a reference frame to ...
... a fixed point on the trunk; in Fig. 2 this fixed point is at the right shoulder. We will refer to this representation as ‘body-centered’. As illustrated in Fig. 2, both schemes will arrive at the same motor error (M). However, with either scheme a difficulty arises in assigning a reference frame to ...
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 ...
Experimental Brain Research 221(1)
... (situated between V6 and MIP within the superior parietal cortex near the junction of the dorsal parieto-occipital sulcus, POS) (Fattori et al. 2001, 2009a; Galletti et al. 2003) and a putative ‘parietal reach region’ (PRR) that straddles the boundary between MIP and V6A (Batista et al. 1999; Buneo ...
... (situated between V6 and MIP within the superior parietal cortex near the junction of the dorsal parieto-occipital sulcus, POS) (Fattori et al. 2001, 2009a; Galletti et al. 2003) and a putative ‘parietal reach region’ (PRR) that straddles the boundary between MIP and V6A (Batista et al. 1999; Buneo ...
Modulation of early cortical processing during divided attention to
... scenarios for attentional suppression under this model (see Predictions section in Materials and methods). The current study therefore examined the topographic distribution of suppressive alpha oscillations to examine whether they fit with the predictions of either model. Another question about the a ...
... scenarios for attentional suppression under this model (see Predictions section in Materials and methods). The current study therefore examined the topographic distribution of suppressive alpha oscillations to examine whether they fit with the predictions of either model. Another question about the a ...
Visual Cortex and Control Processes Stimuli in Opposite Visual
... hemifields did not influence each other within occipital visual cortex in that study, interacting only at the higher level of parietal cortex where some suppression of the response to one hemifield by addition of a concurrent stimulus in the other hemifield was found. Schwartz et al. (2005) therefor ...
... hemifields did not influence each other within occipital visual cortex in that study, interacting only at the higher level of parietal cortex where some suppression of the response to one hemifield by addition of a concurrent stimulus in the other hemifield was found. Schwartz et al. (2005) therefor ...
Visual Memory and Visual Perception Recruit
... takes ten or more minutes) in which a series of items are sequentially presented and participants are instructed to remember each item. In addition to the delay imposed by the length of the encoding phase, there is usually an additional delay on the order of minutes (although this delay can last hou ...
... takes ten or more minutes) in which a series of items are sequentially presented and participants are instructed to remember each item. In addition to the delay imposed by the length of the encoding phase, there is usually an additional delay on the order of minutes (although this delay can last hou ...
Learning in the oculomotor system: from molecules to behavior
... gain can take place within a few hundred saccades [5••] and, therefore, are easily induced within a single experimental session. In the absence of training to reverse adaptation, the changes can last at least 20 h in the dark [6••]. Recent studies of saccadic adaptation illustrate how careful behavi ...
... gain can take place within a few hundred saccades [5••] and, therefore, are easily induced within a single experimental session. In the absence of training to reverse adaptation, the changes can last at least 20 h in the dark [6••]. Recent studies of saccadic adaptation illustrate how careful behavi ...