Filters








559 Hits in 6.9 sec

Linking retinotopic fMRI mapping and anatomical probability maps of human occipital areas V1 and V2

A.M. Wohlschläger, K. Specht, C. Lie, H. Mohlberg, A. Wohlschläger, K. Bente, U. Pietrzyk, T. Stöcker, K. Zilles, K. Amunts, G.R. Fink
2005 NeuroImage  
To allow for a comparison, 3D-probability maps for occipital areas V1 and V2 were created from functional data and compared to cytoarchitectonically defined probability maps of V1 and V2.  ...  of 3D-fieldmaps according to [2] creation of probability maps of areas with positive (V1) and negative (V2) field sign as mean images comparison to anatomical probability maps of BA17 and BA18 from  ... 
doi:10.1016/j.neuroimage.2005.01.021 pmid:15862207 fatcat:bosfq5utofd7niqktvmgr5bazq

Topographic organization of V1 projections through the corpus callosum in humans

M. Saenz, I. Fine
2010 NeuroImage  
Visual-callosal connections in humans and macaques are found along the V1/V2 border where the vertical meridian is represented.  ...  These results confirm and add to a previous diffusion MRI study (Dougherty et al., 2005) which identified a dorsal/ventral mapping of human splenial fibers.  ...  Acknowledgments This work was supported by the NEI (61-4892), Dana Innovations in Neuroimaging and The Mathers Foundation. We thank Christof Koch for comments on the manuscript.  ... 
doi:10.1016/j.neuroimage.2010.05.060 pmid:20553894 pmcid:PMC3165168 fatcat:hiwo244lknffxd63h53lwbndji

Identification of the ventral occipital visual field maps in the human brain

Jonathan Winawer, Nathan Witthoft
2017 F1000Research  
The location and topography of the first three visual field maps in the human brain, V1-V3, are well agreed upon and routinely measured across most laboratories.  ...  The ventro-lateral edge of the map typically falls on the inferior occipital gyrus, where functional MRI artifacts often obscure the retinotopic data.  ...  Yes Winawer and Witthoft describe a standard procedure to define human visual area hV4 within retinotopic mapping data obtained using fMRI.  ... 
doi:10.12688/f1000research.12364.1 pmid:29188017 pmcid:PMC5687318 fatcat:gfjv4zs3djdzpbpjz3pozscmlu

Visual Cortex Plasticity Following Peripheral Damage To The Visual System: fMRI Evidence

João Lemos, Daniela Pereira, Miguel Castelo-Branco
2016 Current Neurology and Neuroscience Reports  
This may preclude the use of restorative treatments in these patients. Here, we review and update the body of fMRI evidence on visual cortical plasticity.  ...  Abnormal fMRI response patterns have been occasionally detected in the visually deprived cortex of patients with bilateral retinal diseases.  ...  Work from our lab has measured the cortical thickness of V1, V2 and V3 areas (pre-retinotopically mapped) in 15 LHON carriers.  ... 
doi:10.1007/s11910-016-0691-0 pmid:27542799 fatcat:omrrvyr6ofatncjrsxeffvkqee

Comparative mapping of higher visual areas in monkeys and humans

Guy A. Orban, David Van Essen, Wim Vanduffel
2004 Trends in Cognitive Sciences  
Acknowledgements This work would not have been possible without the technical support or help of R Vogels, K. Nelissen, K. Denys, D.  ...  Review TRENDS in Cognitive Sciences Conserved early visual areas As noted above, the retinotopic organization of early visual areas V1, V2 and V3 is similar in monkeys and humans [18, 25, 31, 34]  ...  Figure 1a shows an f MRI-based charting of early visual areas (V1, V2, V3) and several mid-level visual areas (V4, MT and V3A) of the monkey, defined by their retinotopic organization and displayed on  ... 
doi:10.1016/j.tics.2004.05.009 pmid:15242691 fatcat:cmftglmiorgkbbpxdwtwechutq

New images from human visual cortex

Roger B.H. Tootell, Anders M. Dale, Martin I. Sereno, Rafael Malach
1996 Trends in Neurosciences  
Several human areas are both motion-and direction-selective, and a progression of motionprocessing steps can be inferred from the imaging data.  ...  Human visual areas for recognizing form are less well defined but the evidence again suggests a progression of information-processing steps and areas,beginning posterior to the human middle temporal area  ...  A map of the activity-based human areas V1, V2, V3, ventral posterior (VP), V3A, ventral V4 (V4v), lateral occipital (LO), MT (V5), posterior division of dorsal medial superior temporal area (pMSTd), lateral  ... 
doi:10.1016/s0166-2236(96)10053-9 pmid:8931274 fatcat:jl5anytq2zg7jk5m5te7mva2k4

Spatial attention improves reliability of fMRI retinotopic mapping signals in occipital and parietal cortex

David W. Bressler, Michael A. Silver
2010 NeuroImage  
When subjects attended to the rotating wedge instead of ignoring it, the reliability of retinotopic mapping signals increased by approximately 50% in early visual cortical areas (V1, V2, V3, V3A/B, V4)  ...  and ventral occipital cortex (VO1) and by approximately 75% in lateral occipital (LO1, LO2) and posterior parietal (IPS0, IPS1, IPS2) cortical areas.  ...  This increase in SNR was observed in early visual (V1, V2, V3, V3A/B, V4), lateral occipital (LO1 and LO2; Larsson and Heeger, 2006) , and ventral occipital (VO1; Brewer et al., 2005) cortical areas  ... 
doi:10.1016/j.neuroimage.2010.06.063 pmid:20600961 pmcid:PMC2930091 fatcat:wdjltsevbjf67itow6v6lel6aq

Functional Analysis of V3A and Related Areas in Human Visual Cortex

Roger B. H. Tootell, Janine D. Mendola, Nouchine K. Hadjikhani, Patrick J. Ledden, Arthur. K. Liu, John B. Reppas, Martin I. Sereno, Anders M. Dale
1997 Journal of Neuroscience  
of V1, V2, V3, and VP; and (3) inferred receptive fields are significantly larger in human V3A, compared with those in more posterior areas such as V1.  ...  These data were compared with data from additional human cortical visual areas, including V1, V2, V3/VP, V4v, and MT (V5).  ...  of V1 and V2.  ... 
doi:10.1523/jneurosci.17-18-07060.1997 pmid:9278542 fatcat:espdtu5wwfcbnntj5tzglteffu

Functional imaging of the visual pathways

Brian A. Wandell, Alex R. Wade
2003 Neurologic clinics  
Whereas fMRI produces compelling images of the living human brain, the link between the images and the science sometimes can be tenuous, and there is a suspicion in the neuroscience community that there  ...  An analysis of the method was premature within the first few years of its discovery, but human fMRI is now a decade old and already has generated more data on the human visual system than was collected  ...  For example, areas V1 and V2 contain a map of the visual field.  ... 
doi:10.1016/s0733-8619(03)00003-3 pmid:12916486 fatcat:6ft3tzwhxjfbdffh2226eetzqa

Reciprocal Anatomical Relationship between Primary Sensory and Prefrontal Cortices in the Human Brain

C. Song, D. S. Schwarzkopf, R. Kanai, G. Rees
2011 Journal of Neuroscience  
Together, these findings indicate that an anatomical trade-off exists between primary sensory cortices and anterior prefrontal cortex as a possible general principle of human cortical organization.  ...  contributes to the formation of anatomically and functionally distant cortical regions.  ...  Materials and Methods The gray matter volumes of early visual areas (V1, V2, V3) were measured using standard retinotopic mapping (Sereno et al., 1995) in a group of 30 healthy human participants.  ... 
doi:10.1523/jneurosci.0308-11.2011 pmid:21715612 pmcid:PMC3202235 fatcat:wgx3xckvkfhcreryej32uzmtkq

From retinotopy to recognition: fMRI in human visual cortex

Roger B.H Tootell, Nouchine K Hadjikhani, Janine D Mendola, Sean Marrett, Anders M Dale
1998 Trends in Cognitive Sciences  
Recent advances in functional magnetic resonance imaging (fMRI) have furnished increasingly informative and accurate maps of the retinotopy and functional organization in human visual cortex.  ...  Functional-anatomical correlates of object priming in humans revealed by rapid presentation event-related fMRI Neuron (in press) g Desimone, R. and Duncan, J. (1995) Neural mechanisms of selective visual  ...  Areas V1, V2, V3, VP, V3A and V4v are classically retinotopic areas. Areas V7, V8 and LOC/LOP are 'fringe' retinotopic areas.  ... 
doi:10.1016/s1364-6613(98)01171-1 pmid:21227152 fatcat:7bjmio65gfbkfdg6db6o5mcbk4

Correspondences between retinotopic areas and myelin maps in human visual cortex

Rouhollah O. Abdollahi, Hauke Kolster, Matthew F. Glasser, Emma C. Robinson, Timothy S. Coalson, Donna Dierker, Mark Jenkinson, David C. Van Essen, Guy A. Orban
2014 NeuroImage  
Comparisons between retinotopic areas and maps of estimated cortical myelin content revealed the following correspondences: (i) areas V1, V2, and V3 are heavily myelinated; (ii) the MT cluster is heavily  ...  We generated probabilistic area maps and maximum probability maps (MPMs) for a set of 18 retinotopic areas previously mapped in individual subjects (Georgieva et al., 2009 and Kolster et al., 2010) using  ...  The authors are grateful to H Mohlberg for providing the probability maps of the cytoarchitectonic areas.  ... 
doi:10.1016/j.neuroimage.2014.06.042 pmid:24971513 pmcid:PMC4121090 fatcat:efow47vkhnatbgcjhvtgvve4ea

Spatiotemporal profiles of visual processing with and without primary visual cortex

Andreas A. Ioannides, Vahe Poghosyan, Lichan Liu, George A. Saridis, Marco Tamietto, Marc Op de Beeck, Xavier De Tiège, Lawrence Weiskrantz, Beatrice de Gelder
2012 NeuroImage  
Within each phase, cortical processing begins in V1 and traverses the visual cortical hierarchy. However, the causal role of V1 in starting each of these two phases is unknown.  ...  The activity then spread forward toward higher-level areas and backward toward lower-level areas.  ...  Black lines indicate the borders between areas V1 and V2 estimated in independent fMRI experiments.  ... 
doi:10.1016/j.neuroimage.2012.07.058 pmid:22877580 fatcat:veayee5p4nfo7p5awpuye32kcy

Cross-dataset reproducibility of population receptive field (pRF) estimates and cortical magnification asymmetries [article]

Marc M. Himmelberg, Jan W. Kurzawski, Noah C. Benson, Denis G. Pelli, Marisa Carrasco, Jonathan Winawer
2021 bioRxiv   pre-print
AbstractPopulation receptive field (pRF) models fit to fMRI data are used to non-invasively measure retinotopic maps in human visual cortex, and these maps are a fundamental component of visual neuroscience  ...  Within V1, V2, V3, and hV4, the group-median NYU and HCP vertex-wise polar angle estimates were nearly identical.  ...  We thank Billy Broderick, Serra Favila, Iris Groen, and Eline Kupers for contributing their datasets to this paper.  ... 
doi:10.1101/2021.04.12.439348 fatcat:yput7uukzjcijljl6osh7uxsom

Improved correspondence of fMRI visual field localizer data after macroanatomical alignment [article]

Mishal Qubad, Catherine Victoria Barnes-Scheufler, Michael Schaum, Eva Raspor, Lara Roesler, Benjamin Peters, Rainer Goebel, Andreas Reif, Robert A Bittner
2021 bioRxiv   pre-print
The study of the visual system and its role for human cognition in health and disease with fMRI often requires the use of localizer paradigms to define anatomical regions of interest (ROIs).  ...  Yet, the potential benefits of CBA has not been investigated for visual field localizer paradigms used to map specific parts of the visual field within retinotopically organized early visual areas.  ...  C.V Barnes-Scheufler was supported by a "main doctus" scholarship from The Polytechnic Foundation of Frankfurt am Main. E.  ... 
doi:10.1101/2021.02.26.433066 fatcat:j3hf56md3ffkvgnr56jhnikeb4
« Previous Showing results 1 — 15 out of 559 results