lateral occipital complex

doi: 10.1016/j.brainres.2006.10.023 pmid: 17141747 OpenUrl CrossRef PubMed sulcus labeled at center right.) (PDF) What Is Actually Affected by the Scrambling of ... Brain Res 1128 : 130 - 138 . In a second task subjects silently named objects (naming task). While several studies tested this network recently, its relationship to the lateral occipital (LO) cortex known to be involved in visual object perception remains largely unknown. This lobe is responsible for object and face recognition, as well … Occipital lobe: anatomy, characteristics Brain Lobes. PDF Attention increases neural selectivity in the human ... The lateral occipital complex (LOC) is a higher-order region of the ventral visual pathway and is traditionally known as a shape processing center in human vision. The Lateral Occipital Complex (LOC), an area of human cortex critical for shape perception (James et al. (Lat. 1604 Journal of Cognitive Neuroscience Volume 29, Number 9 Related Papers. occipital face area modulates cross Occipital lobe: the rear part of each cerebral hemisphere, situated behind the parietal lobe and above the . The integrity of this complex articulation is dependent on a number of supporting ligaments, of which the tectorial membrane and bilateral alar ligaments are the most important [10]. However, the combined effect, which could be either synergistic or antagonistic, remains unclear. Keywords. Object selective regions depicted on the inflated brain of subject NT. We investigated the role of LOC in music processing with use of positron emission tomography (PET). From the MT+ and LOC localizer scans (volume acquisition time 2 s; Functional anatomy of the lateral occipital complex (LOC). The human lateral occipital complex (LOC) has been implicated in object recognition, but it is unknown whether this region represents low-level image features or perceived object shape. Research output: Contribution to journal › Article › peer-review. The perception of faces involves a large network of cortical areas of the human brain. Lateral Occipital Complex Zoe Kourtzi1,2* and Nancy Kanwisher1,3 The human lateral occipital complex (LOC) has been implicated in object recognition, but it is unknown whether this region represents low-level image features or perceived object shape. The ability of the human visual system to recognize partially occluded objects is a striking feat, which has received extensive psychophysical documentation. Subjects viewed, through a mirror, images that were back-projected onto a screen. the lateral occipital complex (LOC). Attention increases neural selectivity in the human lateral occipital complex Scott O Murray1,3& Ewa Wojciulik1,2 It is well established that attention increases the efficiency of information processing, but the neural mechanisms underlying this improvement are not fully understood. The perception of faces involves a large network of cortical areas of the human brain. Identical objects (tools, animals and letters) were presented for both tasks. The human lateral occipital complex (LOC) is more strongly activated by images of objects compared to scrambled controls, but detailed information at the neuronal level is currently lacking. We find surprisingly adult-like functional specialization of the LOC by 6 months of age: infants exhibit shape selectivity, but not object selectivity, in this region. Alternating blocks of intact and scrambled objects were presented. Emotional salience and working memory (WM) load are known to affect object processing in the ventral stream. Objective: Most of the western music consists of a melody and an accompaniment. Neural evidence for intermediate representations in object recognition. From the MT+ and LOC localizer scans (volume acquisition time 2 s; First, TMS delivered to the lateral-occipital complex (LOC), a visual-form area, affected the naming of objects presented in contralateral but not ipsilateral space, independent of which hemisphere was stimulated. Introduction The human visual cortex contains many areas whose functional characteristics, connectivity, and anatomy have been extensively documented [1]. The second possible mechanism instead involves integration across different levels of the visual hierarchy, with inputs from primary visual cortex converging on cells with larger receptive fields in higher-order regions of visual cortex such as the lateral occipital complex (Hubel and Wiesel, 1962; Spillmann and Werner, 1996). The brain inflation algorithm was created by the Freesurfer and Fsfast software packages developed at MGH, Charlestown, MA. Object Representations in Lateral Occipital Complex Mayu Nishimura, K. Suzanne Scherf, Valentinos Zachariou, Michael J. Tarr, and Marlene Behrmann Abstract Although object perception involves encoding a wide variety ofobjectproperties(e.g.,size,color,viewpoint),someproperties are irrelevant for identifying the object. Here we studied the manifestation of completion effects in the functional magnetic resonance imaging (fMRI) activation of high-order object areas (the lateral occipital complex — LOC). We used functional magnetic resonance imaging and dynamic causal modeling (DCM) to test the effective connectivity among the . The top panel illustrates the lateral view of the brain and the bottom panel the ventral view. In one task, subjects responded when an object repeated (matching task). We previously demonstrated that schizophrenia patients had broader topography and reduced magnitude of activity of LO. We used functional magnetic resonance imaging and dynamic causal modeling (DCM) to test the effective connectivity among the . The lateral occipital complex and its role in object recognition Here we review recent findings that reveal the functional properties of extra-striate regions in the human visual cortex that are involved in the representation and perception of objects. Background Segregation, Lateral Occipital Complex (LOC) 1. The lateral occipital complex (LOC) is a set of areas in the human occipito-temporal cortex responding to objects as opposed to low-level control stimuli. Functional anatomy of the lateral occipital complex (LOC). we used an event-related functional mag-netic resonance imaging adaptation paradigm in which the response to pairs ofsuccessively presented stimuli is lower when … (1995) discovered that the lateral occipital cortex (LO) and the posterior fusiform gyrus (pFs), cortical areas that they termed the Lateral Occipital Complex (LOC), yielded greater fMRI BOLD responses when viewing intact images of familiar objects than when viewing their scrambled versions resembling texture. Each subject participated in one session consisting of 12 functional scans, each comprising 18 epochs (each epoch was 12 s long): four MT+ motion localizer scans, four lateral occipital complex (LOC) object localizers, and finally four shape-from-motion scans. The key to successful localizer scans, four lateral occipital complex (LOC) object localizers, and finally four shape-from-motion scans. Skull @Cranial skeleton (Neurocranium) eCalarvia CC" se) @Frontal, Temporal, Parietal, Occipital @Cranial base @Facial In visual processing, the lateral occipital complex (LOC) is known to participate in foreground and background segregation. Lateral surface of left cerebral hemisphere, viewed from the side. In all experiments, the subjects fixated centrally on a stationary red dot. The lateral occipital complex and its role in object recognition Vision Research , 41 ( 10-11 ) ( 2001 ) , pp. It is operationally defined as the area showing greater activation from the perception of in- fMR signal due to repeated presentation of identicalreported that high-order human visual areas show a images. Using functional magnetic resonance imaging . Cultural differences in the lateral occipital complex while viewing incongruent scenes Lucas J. Jenkins , 1 Yung-Jui Yang , 2 Joshua Goh , 3 Ying-Yi Hong , 2, 4 and Denise C. Park 5 Lucas J. Jenkins We used an event-related functional mag- fNIRS The human lateral occipital complex (LOC) is more strongly activated by images of objects compared to scrambled controls, but detailed information at the neuronal level is currently lacking. The invariant properties of fMR adaptation were studied by presenting the same object in different viewing conditions. localizer scans, four lateral occipital complex (LOC) object localizers, and finally four shape-from-motion scans. The second possible mechanism instead involves integration across different levels of the visual hierarchy, with inputs from primary visual cortex converging on cells with larger receptive fields in higher-order regions of visual cortex such as the lateral occipital complex (Hubel and Wiesel, 1962; Spillmann and Werner, 1996). Simply Psychology of the Brain The brain is separated into four parts (lobes) that are all responsible for different jobs. Functional anatomy of the lateral occipital complex (LOC). Malach et al. Here we studied the manifestation of completion effects in the functional magnetic resonance imaging (fMRI) activation of high-order object areas (the lateral occipital complex — LOC). Altered dynamic coupling of lateral occipital complex during visual perception in schizophrenia. While several studies tested this network recently, its relationship to the lateral occipital (LO) cortex known to be involved in visual object perception remains largely unknown. Subjects viewed, through a mirror, images that were back-projected onto a screen. Journal of Vision, 16, 3. 2003), is comprised of the Lateral Occipital Cortex (LO) and the Posterior Fusiform gyrus (pFs). The top panel illustrates the lateral view of the brain and the bottom panel the ventral view. The melody is referred to as the foreground, with the accompaniment the background. (2007) Task-related laterality effects in the lateral occipital complex. In all experiments, the subjects fixated centrally on a stationary red dot. The brain inflation algorithm was created by the Freesurfer and Fsfast software packages developed at MGH, Charlestown, MA. Several studies have revealed the brain regions in association with recognition of the segregation between foreground and background . 1409 - 1422 Article Download PDF View Record in Scopus Google Scholar Nature, net response to object familiarity. The ability of the human visual system to recognize partially occluded objects is a striking feat, which has received extensive psychophysical documentation. Philippe Olivier Harvey, Junghee Lee, Mark S. Cohen, Stephen A. Engel, David C. Glahn, Keith H. Nuechterlein, Jonathan K. Wynn, Michael F. Green. Overall, these results indicate that the lateral occipital complex plays an important role in human object recognition. The brain inflation algorithm was created by the Freesurfer and Fsfast software packages developed at MGH, Charlestown, MA. View ilovepdf_merged (3).pdf from BIO 807 at Universidad de Zamboanga. The top panel illustrates the lateral view of the brain and the bottom panel the ventral view. The brain inflation algorithm was created by the Freesurfer and Fsfast software packages developed at MGH, Charlestown, MA. The lateral occipital complex (LOC), composed of the lateral occipital cortex (LO) and the posterior fusiform gyrus (pFs), has been implicated as critical for object perception (James, Culham, Humphrey, Milner, & Goodale, 2003). By Irving . Functional anatomy of the lateral occipital complex (LOC). Here we addressed this issue by investigating whether the object-selective lateral occipital (LO) cortex, a key brain region in object and shape processing, is causally involved in bilateral symmetry detection. The human lateral occipital complex (LOC) has been implicated in object recognition, but it is unknown whether this region represents low-level image features or perceived object shape. The lateral occipital complex, which mainly includes the fusiform face area (FFA), the lateral occipital cortex (LOC), and medially adjacent regions, plays an important role in human object . 440, 91-95. occ. Object selective regions depicted on the inflated brain of subject NT. Object recognition; LO1 and LO2 overlapped with the . In the occipital lobe, the lateral occipital sulcus, where present, divides the lateral, or middle occipital gyrus into a superior and an inferior part, which are then continuous in front with the parietal and . Object-selective regions (lateral occipital com-reduction in the fMR signal when presented repetitively plex [LOC]) showed a monotonic signal decrease aswith the same visual stimulus (Martin et al., 1995; Stern This study expands our knowledge of visual development by investigating the functional development of mid-level vision [lateral occipital cortex (LOC)] early in infancy. The lateral occipital complex shows no supporting visual short-term memory for objects. The invariant properties of fMR adaptation were studied by presenting the same object in different viewing conditions. Object-selective regions (lateral occipital complex [LOC]) showed a monotonic signal decrease as repetition frequency increased. Object selective regions depicted on the inflated brain of subject NT. Object selective regions depicted on the inflated brain of subject NT. Lateral occipital sulcus. A challenge to this model posits that the lateral occipital complex is a general site for crude region-based segmentation, based on findings of equivalent hemodynamic activations in the lateral occipital complex to illusory contour and so-called salient region stimuli, a stimulus class that lacks the classic bounding contours of illusory contours. Introduction: There is mounting evidence that visual perception abnormalities in schizophrenia are partly explained by a dysfunction of the lateral occipital complex (LO). The lateral occipital complex (LOC), composed of the lateral occipital cortex (LO) and the posterior fusiform gyrus (pFs), has been implicated as critical for object perception ( James, Culham, Humphrey, Milner, & Goodale, 2003 ). The lateral occipital complex subserves the perceptual persistence of motion-defined groupings Authors Susanne Ferber 1 , G Keith Humphrey , Tutis Vilis Affiliation 1 CIHR Group for Action and Perception, Department of Psychology, University of Western Ontario, London, Ontario, Canada N6A 5C2. Subjects viewed, through a mirror, images that were back-projected onto a screen. The top panel illustrates the lateral view of the brain and the bottom panel the ventral view. the human lateral occipital complex (loc) has been implicated in objectrecognition, but it is unknown whether this region represents low-level imagefeatures or perceived object shape. Object-selective regions (lateral occipital complex [LOC]) showed a monotonic signal decrease as repetition frequency increased. Occipital condyle fractures are important because they may be associated with instability of the occipitoatlantoaxial joint complex. The lateral occipital complex and its role in object recognition Here we review recent findings that reveal the functional properties of extra-striate regions in the human visual cortex that are involved in the representation and perception of objects. ferber@psych.utoronto.ca PMID: 12816886 It is localized as the region that shows greater BOLD activity when viewing intact objects compared to their pixel-scrambled (texturized) versions. 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