Functional architecture in monkey inferotemporal cortex revealed by
... size of imaged area was adjusted by selecting an appropriate combination of lenses with different focal distances, 35 and 50 mm. The CCD camera was focused on a plane 300 mm below the cortical surface. A trial of recording was initiated by first synchronizing a certain phase of respiration by stoppi ...
... size of imaged area was adjusted by selecting an appropriate combination of lenses with different focal distances, 35 and 50 mm. The CCD camera was focused on a plane 300 mm below the cortical surface. A trial of recording was initiated by first synchronizing a certain phase of respiration by stoppi ...
KISHORE Aswathy - School of Computing
... goal had to dropped due to time constraints and hence more focus shifted to writing up the tasks which had been done till then and also to extend these sub-tasks such that it was not constrained by the time available. ...
... goal had to dropped due to time constraints and hence more focus shifted to writing up the tasks which had been done till then and also to extend these sub-tasks such that it was not constrained by the time available. ...
Brain Research, 178 (1979) 363-380 363 © Elsevier/North
... Of the multi-unit fields, 69 ~ (288) extended into the ipsilateral visual field by 3° or more. The median extent of the ipsilateral border of these fields was 14°. As with receptive field size, there was local clustering of receptive field laterality. That is, the fields on a single penetration and ...
... Of the multi-unit fields, 69 ~ (288) extended into the ipsilateral visual field by 3° or more. The median extent of the ipsilateral border of these fields was 14°. As with receptive field size, there was local clustering of receptive field laterality. That is, the fields on a single penetration and ...
High-Level Visual Processing: Cognitive Influences
... well as the real or implied actions of others that enables us to take action based on visual information. The identification of significant elements in the visual field is thus the nexus between vision and cognition. ...
... well as the real or implied actions of others that enables us to take action based on visual information. The identification of significant elements in the visual field is thus the nexus between vision and cognition. ...
Chapter 29 - krigolson teaching
... patients are presented with only two stimuli, one in each field, they report seeing only the stimulus in the ipsilateral hemifield. They do not have the ability to focus attention in the hemifield contralateral to the lesion, and as a result they may not see everything in that hemifield, even though ...
... patients are presented with only two stimuli, one in each field, they report seeing only the stimulus in the ipsilateral hemifield. They do not have the ability to focus attention in the hemifield contralateral to the lesion, and as a result they may not see everything in that hemifield, even though ...
click here for PDF
... 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-based theories fail to provide totally convincing explanations. Recent work, however, ha ...
... 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-based theories fail to provide totally convincing explanations. Recent work, however, ha ...
new insights into the functions of the superior temporal cortex
... Although the superior temporal cortex in the left cerebral hemisphere of the human has long been known to subserve language processes, its function in the human right hemisphere has remained uncertain. It has been suggested1,2 that lesions of the monkey superior temporal cortex induce behavioural ab ...
... Although the superior temporal cortex in the left cerebral hemisphere of the human has long been known to subserve language processes, its function in the human right hemisphere has remained uncertain. It has been suggested1,2 that lesions of the monkey superior temporal cortex induce behavioural ab ...
Analyzing Neural Responses to Natural Signals: Maximally
... & Bialek, 2000). All of these arguments point to the need for general tools to analyze the neural responses to complex, naturalistic inputs. The stimuli analyzed by sensory neurons are intrinsically high-dimensional, with dimensions D » 102 ¡ 103 . For example, in the case of visual neurons, the inp ...
... & Bialek, 2000). All of these arguments point to the need for general tools to analyze the neural responses to complex, naturalistic inputs. The stimuli analyzed by sensory neurons are intrinsically high-dimensional, with dimensions D » 102 ¡ 103 . For example, in the case of visual neurons, the inp ...
... which, when injured, led to a sensory impairment of language. The patients with such lesions were unable to recognize spoken words, even when they han an intact audition. Wernicke postulated that this area (which was named in his honor), was connected to Broca’s area, thus forming a complex system r ...
Alterations to multisensory and unisensory integration by stimulus
... Fig. 2. The effect of competitive stimulus interactions on unisensory and multisensory responses in an example neuron. A: within the schematics of visual-auditory space (each concentric circle represents 10°), icons denote the locations of visual (V), auditory (A), and cross-modal (VA) stimuli relat ...
... Fig. 2. The effect of competitive stimulus interactions on unisensory and multisensory responses in an example neuron. A: within the schematics of visual-auditory space (each concentric circle represents 10°), icons denote the locations of visual (V), auditory (A), and cross-modal (VA) stimuli relat ...
Contextual modulation of primary visual cortex by auditory signals
... feedforward geniculate inputs activate classical receptive fields, whereas auditory signals activate the non-classical receptive field of V1 neurons, carried by cortical feedback. Top-down auditory signals to V1 may originate directly from auditory cortex, or indirectly via extrastriate cortex or mu ...
... feedforward geniculate inputs activate classical receptive fields, whereas auditory signals activate the non-classical receptive field of V1 neurons, carried by cortical feedback. Top-down auditory signals to V1 may originate directly from auditory cortex, or indirectly via extrastriate cortex or mu ...
Role of Feedforward and Feedback Projections in Figure
... 3. Contextual modulation of classical receptive field responses The feedforward established response property of visual neurons is not fixed. It can be modified by factors such as experience and learning, or, more importantly, by the spatial and temporal context in which a stimulus is presented. The ...
... 3. Contextual modulation of classical receptive field responses The feedforward established response property of visual neurons is not fixed. It can be modified by factors such as experience and learning, or, more importantly, by the spatial and temporal context in which a stimulus is presented. The ...
primary visual cortex and visual awareness
... ‘master map’ or spatial–featural index to bind perceptual information across multiple areas. Interactive models predict that disruption of V1 activity should always impair awareness even if extrastriate activity remains intact. Some versions of this theory might also predict some correlation between ...
... ‘master map’ or spatial–featural index to bind perceptual information across multiple areas. Interactive models predict that disruption of V1 activity should always impair awareness even if extrastriate activity remains intact. Some versions of this theory might also predict some correlation between ...
The Receptive Fields of Inferior Temporal Cortex Neurons in Natural
... sufficient, but especially when two stimuli were on the screen, one or two more saccades were sometimes needed, because sometimes the first saccade was to the nontarget object. The firing rates of a cell as a function of the distance from the effective stimulus were measured during each period in wh ...
... sufficient, but especially when two stimuli were on the screen, one or two more saccades were sometimes needed, because sometimes the first saccade was to the nontarget object. The firing rates of a cell as a function of the distance from the effective stimulus were measured during each period in wh ...
Novel visual stimuli activate a population of neurons
... novel images (typically two face and two non-face). (The images were completely novel in that they had never been seen before by the monkey.) The four familiar stimuli included the S¡, included to make sure that the monkey looked at and processed the stimuli on every trial. It is emphasized that all ...
... novel images (typically two face and two non-face). (The images were completely novel in that they had never been seen before by the monkey.) The four familiar stimuli included the S¡, included to make sure that the monkey looked at and processed the stimuli on every trial. It is emphasized that all ...
5655.full - Journal of Neuroscience
... the fractal with the emotion in the presented video clip and were informed that they would be tested on the association. The association between fractals and emotional stimuli was tested after the learning session. Participants were presented with the fractal stimuli and tested on how quickly and ac ...
... the fractal with the emotion in the presented video clip and were informed that they would be tested on the association. The association between fractals and emotional stimuli was tested after the learning session. Participants were presented with the fractal stimuli and tested on how quickly and ac ...
Vision in Drosophila - University of Queensland
... a clue for researchers investigating the underlying neuroanatomy: Motion vision is more concerned with contrast changes and the delays that describe a moving object than with specific spectral qualities or geometrical arrangements of objects (Figure 1c). Motion vision can be wide-field, as caused by o ...
... a clue for researchers investigating the underlying neuroanatomy: Motion vision is more concerned with contrast changes and the delays that describe a moving object than with specific spectral qualities or geometrical arrangements of objects (Figure 1c). Motion vision can be wide-field, as caused by o ...
Recounting the impact of Hubel and Wiesel
... to demonstrate the flow of current across visual cortex during pattern vision. Human subjects with an electrode over the presumed foveal representation in primary visual cortex fixated on a spot on a screen in front of them and a patterned stimulus was then passed across the fixation point. Kohler a ...
... to demonstrate the flow of current across visual cortex during pattern vision. Human subjects with an electrode over the presumed foveal representation in primary visual cortex fixated on a spot on a screen in front of them and a patterned stimulus was then passed across the fixation point. Kohler a ...
PDF hosted at the Radboud Repository of the Radboud University Nijmegen
... colour, m otion or the orientation of contours, are detected by the visual system in a local and parallel manner. Subsequently, these perceptual com ponents are integrated and bound into organized units to provide the basis for a coherent representation of the respective objects. As already shown b ...
... colour, m otion or the orientation of contours, are detected by the visual system in a local and parallel manner. Subsequently, these perceptual com ponents are integrated and bound into organized units to provide the basis for a coherent representation of the respective objects. As already shown b ...
View PDF - Laboratory of Brain, Hearing and Behavior
... Selection deficits caused by SC inactivation in monkeys and improved peak discrimination by switch-like responses in the OT of owls. (a) Effect of focal SC inactivation on behavioral performance by monkeys in a contrast, oddball task. The task was the same as described in Figure 2a, except that the ...
... Selection deficits caused by SC inactivation in monkeys and improved peak discrimination by switch-like responses in the OT of owls. (a) Effect of focal SC inactivation on behavioral performance by monkeys in a contrast, oddball task. The task was the same as described in Figure 2a, except that the ...
The role of early visual cortex in visual integration: a neural model of
... the number of distractors. This suggests a parallel and ‘preattentive’ mechanism that can be implemented by the early retinotopic visual areas. On the other hand, when both target and distractors are composed of similar elementary features, the amount of time required to distinguish between them inc ...
... the number of distractors. This suggests a parallel and ‘preattentive’ mechanism that can be implemented by the early retinotopic visual areas. On the other hand, when both target and distractors are composed of similar elementary features, the amount of time required to distinguish between them inc ...
Competitive Dynamics in Cortical Responses to Visual Stimuli
... network operated in what we termed normalization mode. If the strength of the inhibition was increased, the network entered an oscillatory mode in which the two pools were alternately active (Fig. 3B). At high inhibitory strength, the network operated in a winner-take-all mode in which only one pool ...
... network operated in what we termed normalization mode. If the strength of the inhibition was increased, the network entered an oscillatory mode in which the two pools were alternately active (Fig. 3B). At high inhibitory strength, the network operated in a winner-take-all mode in which only one pool ...
Mapping Retinotopic Structure in Mouse Visual Cortex with Optical
... placed within area 17, which was determined previously by optical imaging. Using a similar stimulus as described above (five columns, three rows, 35° side length), we recorded the spike response of 22 single cells discriminated by their waveforms (Brainware, Oxford, UK). Instead of randomizing orien ...
... placed within area 17, which was determined previously by optical imaging. Using a similar stimulus as described above (five columns, three rows, 35° side length), we recorded the spike response of 22 single cells discriminated by their waveforms (Brainware, Oxford, UK). Instead of randomizing orien ...
PDF preprint - The Computational Neurobiology Laboratory
... Lewis-Williams, 1998) and scratched on petroglyphs (Patterson, 1992). Hallucinatory images are seen both when falling asleep (Dybowski, 1939), and on waking up (Mavromatis, 1987), following sensory deprivation (Zubek, 1969), after taking ketamine and related anaesthetics (Collier, 1972), after seein ...
... Lewis-Williams, 1998) and scratched on petroglyphs (Patterson, 1992). Hallucinatory images are seen both when falling asleep (Dybowski, 1939), and on waking up (Mavromatis, 1987), following sensory deprivation (Zubek, 1969), after taking ketamine and related anaesthetics (Collier, 1972), after seein ...
Representational Capacity of Face Coding in Monkeys
... recorded cells are shown in Figure 1. Six of the recorded cells showed strongly graded responses like those shown in Figure la. Three cells displayed more weakly graded responses as in Figure 16. Three cells had graded responses that tended to cluster into two or more groups. One such cell is shown ...
... recorded cells are shown in Figure 1. Six of the recorded cells showed strongly graded responses like those shown in Figure la. Three cells displayed more weakly graded responses as in Figure 16. Three cells had graded responses that tended to cluster into two or more groups. One such cell is shown ...
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.