Functional Clustering Drives Encoding Improvement in a
... electrophysiological recording. Pink shading marks time of stimulus. The electrical transients bounding the stimulus period are clipped. Colored dots mark individual action potentials, which are magnified in the boxes at bottom. doi:10.1371/journal.pbio.1001236.g001 ...
... electrophysiological recording. Pink shading marks time of stimulus. The electrical transients bounding the stimulus period are clipped. Colored dots mark individual action potentials, which are magnified in the boxes at bottom. doi:10.1371/journal.pbio.1001236.g001 ...
Organization of Visual Areas in Macaque and
... neighboring regions are often subtle, even when evaluated with the most sensitive anatomical and physiological techniques available. (ii) Internal heterogeneity. Many (perhaps most) visual areas are internally heterogeneous. This heterogeneity may be manifested by modularity (repetitive organization ...
... neighboring regions are often subtle, even when evaluated with the most sensitive anatomical and physiological techniques available. (ii) Internal heterogeneity. Many (perhaps most) visual areas are internally heterogeneous. This heterogeneity may be manifested by modularity (repetitive organization ...
Scene perception: inferior temporal cortex neurons encode the
... respond in complex scenes with multiple objects present, and used five stimuli simultaneously presented with one at the fovea and four in the surrounding parafovea so that quantitative and controlled data could be obtained. The stimuli were arranged as shown in Fig. 1, and the eyes were held still on ...
... respond in complex scenes with multiple objects present, and used five stimuli simultaneously presented with one at the fovea and four in the surrounding parafovea so that quantitative and controlled data could be obtained. The stimuli were arranged as shown in Fig. 1, and the eyes were held still on ...
Representation of Acoustic Communication Signals
... The overall rhythmic structure of a song is evident in the power spectral density of the AM signal (see Fig. 1B, C, right panels). Gaps within a syllable result in more prominent higher-frequency spectral components (Fig. 1C, arrow). Distribution of natural A M signals. To restrict attention to carr ...
... The overall rhythmic structure of a song is evident in the power spectral density of the AM signal (see Fig. 1B, C, right panels). Gaps within a syllable result in more prominent higher-frequency spectral components (Fig. 1C, arrow). Distribution of natural A M signals. To restrict attention to carr ...
Contributions of temporal-parietal junction to the human
... Extensive lateral parietal lobe lesions produced no decrement in the P3, even from electrodes placed directly over lesioned cortex. Apparently, substantial areas of lateral parietal cortex are not critical for generation of the auditory P3. In contrast, the P3a and P3b were abolished over both parie ...
... Extensive lateral parietal lobe lesions produced no decrement in the P3, even from electrodes placed directly over lesioned cortex. Apparently, substantial areas of lateral parietal cortex are not critical for generation of the auditory P3. In contrast, the P3a and P3b were abolished over both parie ...
Pioneers of cortical plasticity: six classic papers by Wiesel and Hubel
... cortices were recorded from 2.5– 4.5 months later. In these animals, most active cells could be driven through both eyes, and some with simple and complex receptive field properties were found. However, many cells lacked a defined orientation preference, and roughly one-quarter of the active cells w ...
... cortices were recorded from 2.5– 4.5 months later. In these animals, most active cells could be driven through both eyes, and some with simple and complex receptive field properties were found. However, many cells lacked a defined orientation preference, and roughly one-quarter of the active cells w ...
Motion perception: Seeing and deciding
... We conducted electrophysiological experiments in two macaque monkeys, obtaining similar results in the two animals. LIP was identified by the characteristic visual and saccaderelated activity of its neurons, and by its location on the lateral bank of the intraparietal sulcus. Single-unit activity of ...
... We conducted electrophysiological experiments in two macaque monkeys, obtaining similar results in the two animals. LIP was identified by the characteristic visual and saccaderelated activity of its neurons, and by its location on the lateral bank of the intraparietal sulcus. Single-unit activity of ...
Self-Organization and Functional Role of Lateral Connections and
... above models replicate the self-organization of a erent structures quite well, they are based on the simpli cation that the neuronal response properties are primarily determined by the organization of a erent synapses. Lateral interactions between neurons are approximated by simple mathematical func ...
... above models replicate the self-organization of a erent structures quite well, they are based on the simpli cation that the neuronal response properties are primarily determined by the organization of a erent synapses. Lateral interactions between neurons are approximated by simple mathematical func ...
Been There, Seen That: A Neural Mechanism for Performing
... This definition helps to exclude saccades that result in short fixation durations during which the animal is clearly aware that the item he is fixating is not the reward loaded target. Fixations with durations of ⬎500 ms were completely informative; if the monkey was looking at a potential target an ...
... This definition helps to exclude saccades that result in short fixation durations during which the animal is clearly aware that the item he is fixating is not the reward loaded target. Fixations with durations of ⬎500 ms were completely informative; if the monkey was looking at a potential target an ...
file
... different numbers of neurons included in different ‘multi-unit’ responses recorded in this study, response amplitude was normalized using the number of spikes evoked at each site to an isolated tone. The normalized RRTF was defined as the average number of spikes evoked for each of the last five ton ...
... different numbers of neurons included in different ‘multi-unit’ responses recorded in this study, response amplitude was normalized using the number of spikes evoked at each site to an isolated tone. The normalized RRTF was defined as the average number of spikes evoked for each of the last five ton ...
A Feedback Model of Visual Attention
... account of the neurophysiological data associated with attention (Frith, 2001; Kastner and Ungerleider, 2000). This theory proposes that visual stimuli compete to be represented by cortical activity. Competition may occur at each stage along the visual information processing pathway. The outcome of ...
... account of the neurophysiological data associated with attention (Frith, 2001; Kastner and Ungerleider, 2000). This theory proposes that visual stimuli compete to be represented by cortical activity. Competition may occur at each stage along the visual information processing pathway. The outcome of ...
Homeostatic plasticity mechanisms in mouse V1
... of vision in one eye for several days while the other eye is allowed to see causes a rapid reduction of visual responses to the deprived eye (measured, of course, with good optics in both eyes) [7]. This manipulation is referred to as monocular deprivation (MD), and the change in response is referre ...
... of vision in one eye for several days while the other eye is allowed to see causes a rapid reduction of visual responses to the deprived eye (measured, of course, with good optics in both eyes) [7]. This manipulation is referred to as monocular deprivation (MD), and the change in response is referre ...
Topographic Maps are Fundamental to Sensory
... for neurons in the retina, but more generally for neurons within cortical and subcortical sensory structures [6]. When receptive fields are small, the comparison is between very limited parts of a receptor surface, but neurons with large receptive fields make more global comparisons. It is easy to s ...
... for neurons in the retina, but more generally for neurons within cortical and subcortical sensory structures [6]. When receptive fields are small, the comparison is between very limited parts of a receptor surface, but neurons with large receptive fields make more global comparisons. It is easy to s ...
The Representation of Complex Images in Spatial Frequency
... The organization of cat primary visual cortex has been well mapped using simple stimuli such as sinusoidal gratings, revealing superimposed maps of orientation and spatial frequency preferences. However, it is not yet understood how complex images are represented across these maps. In this study, we ...
... The organization of cat primary visual cortex has been well mapped using simple stimuli such as sinusoidal gratings, revealing superimposed maps of orientation and spatial frequency preferences. However, it is not yet understood how complex images are represented across these maps. In this study, we ...
A Computer Simulation of Olfactory Cortex with Functional
... the weights obtained during this training, the model was trained on a new nonoverlapping (Le. different input fibers activated) stimulus B. Both stimulus A and stimulus B alone activated roughly 25% of the cortical pyramidal neurons with 25% overlap between the two responses. Following the second tr ...
... the weights obtained during this training, the model was trained on a new nonoverlapping (Le. different input fibers activated) stimulus B. Both stimulus A and stimulus B alone activated roughly 25% of the cortical pyramidal neurons with 25% overlap between the two responses. Following the second tr ...
The role of neuronal synchronization in selective attention
... change had occurred. This finding suggests that the processing or the signalling of a sensory change is more efficient when it is handled by an area that is engaged in enhanced gamma-band synchronization [6]. Importantly, the influence of local synchronization of behavioural responses was spatiall ...
... change had occurred. This finding suggests that the processing or the signalling of a sensory change is more efficient when it is handled by an area that is engaged in enhanced gamma-band synchronization [6]. Importantly, the influence of local synchronization of behavioural responses was spatiall ...
Neuroimaging of cognitive functions in human parietal cortex Jody C
... include visual areas V7 and/or V3A; posterior IPS; and anterior IPS) are activated by both saccades and attention [22]. One of these areas may be the homologue of monkey LIP [23••], which is also strongly driven by saccades and attention [10]. The most likely candidate region lies in the mid-posteri ...
... include visual areas V7 and/or V3A; posterior IPS; and anterior IPS) are activated by both saccades and attention [22]. One of these areas may be the homologue of monkey LIP [23••], which is also strongly driven by saccades and attention [10]. The most likely candidate region lies in the mid-posteri ...
Surface-view connectivity patterns of area 18 in cats
... There is also a general acceptance that each different method of subdividing cortex has its own strengths and weaknesses, and that the most reliable approach is to use multiple criteria and converging evidence from different procedures. In cats, visual cortex has been divided using several criteria ...
... There is also a general acceptance that each different method of subdividing cortex has its own strengths and weaknesses, and that the most reliable approach is to use multiple criteria and converging evidence from different procedures. In cats, visual cortex has been divided using several criteria ...
Organization of Visual Areas in Macaque and Human Cerebral
... across multiple approaches, and replicated by multiple laboratories. The diversity among partitioning schemes signifies that a consensus has been achieved for only a minority of the visual areas illustrated in Figure 2. Several well-defined areas (V1, V2, V4, and MT) are shown by individualized colo ...
... across multiple approaches, and replicated by multiple laboratories. The diversity among partitioning schemes signifies that a consensus has been achieved for only a minority of the visual areas illustrated in Figure 2. Several well-defined areas (V1, V2, V4, and MT) are shown by individualized colo ...
How Reliably Does a Neuron in the Visual Motion Pathway of fhe Fly
... 1366 Reliability of a fly motion-sensitive neuron on the relationship between the amplitude of the noise and that of the stimulus-induced response component ('SIRC'). In a normal behavioural situation the animal's own actions and reactions have immediate consequences on its sensory input. Therefore ...
... 1366 Reliability of a fly motion-sensitive neuron on the relationship between the amplitude of the noise and that of the stimulus-induced response component ('SIRC'). In a normal behavioural situation the animal's own actions and reactions have immediate consequences on its sensory input. Therefore ...
Escape behavior and neuronal responses to looming stimuli in the
... consisted of a 5·cm black square, which approached over a distance of 70·cm at a constant speed of 20·cm·s–1 (Fig.·1B). Thus, for the crab’s eye the stimulus had an apparent size subtending an angle of 4° at its stationary initial position and expanded until covering the entire screen (77° width, 62 ...
... consisted of a 5·cm black square, which approached over a distance of 70·cm at a constant speed of 20·cm·s–1 (Fig.·1B). Thus, for the crab’s eye the stimulus had an apparent size subtending an angle of 4° at its stationary initial position and expanded until covering the entire screen (77° width, 62 ...
Neural Basis of Prosopagnosia: An fMRI Study
... to control stimuli in the right hemisphere of a normal subject (B,G) activated two areas: the anterior part of the collateral sulcus and and in three prosopagnosic patients (C–E,H–J). As in Figure 1, data fusiform gyrus (FFA, in blue) and the inferior occipital gyrus and are represented in a flatten ...
... to control stimuli in the right hemisphere of a normal subject (B,G) activated two areas: the anterior part of the collateral sulcus and and in three prosopagnosic patients (C–E,H–J). As in Figure 1, data fusiform gyrus (FFA, in blue) and the inferior occipital gyrus and are represented in a flatten ...
Retinotopic Organization and Functional Subdivisions of the Human
... The subjects’ heads were surrounded by foam to reduce head movements; subject S2 also used a bite bar. Data analysis. The first four volumes in each run were discarded. To compensate for subject head movement and scanner drift, the remaining volumes were registered (Woods et al., 1998) to the fifth ...
... The subjects’ heads were surrounded by foam to reduce head movements; subject S2 also used a bite bar. Data analysis. The first four volumes in each run were discarded. To compensate for subject head movement and scanner drift, the remaining volumes were registered (Woods et al., 1998) to the fifth ...
Oriented Axon Projections in Primary Visual Cortex of the Monkey
... primates. Another source for patterned input related to orientation tuning is the extensive lateral circuitry found in layers 2/3 and 4B (Rockland and Lund, 1983). These intralaminar projections could capture the spatial geometry of a line stimulus by recapitulating retinotopy, specifically by distr ...
... primates. Another source for patterned input related to orientation tuning is the extensive lateral circuitry found in layers 2/3 and 4B (Rockland and Lund, 1983). These intralaminar projections could capture the spatial geometry of a line stimulus by recapitulating retinotopy, specifically by distr ...