Estimating linear cortical magnification in human primary visual cortex via dynamic programming

Qiu, Anqi; Rosenau, Benjamin J.; Greenberg, Adam S.; Hurdal, Monica K.; Barta, Patrick E.; Yantis, Steven; Miller, Michael I.

doi:10.1016/j.neuroimage.2005.11.049

Cited by 73 publications

(76 citation statements)

References 51 publications

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“…In MT/V5, eccentricities between 1 and 4°are represented along 12 mm cortex, corresponding to a magnification factor of 4 mm per visual degree. In V1, the magnification for those eccentricities would be approximately double according to Larsson and Heeger (2006) and Qiu et al (2006). This fits with the ratio of the surface areas of MT/V5 and V1 (Table 2), as ͌5 equals 2.2.…”

Section: General Features Of the Mt/v5 Clustersupporting

confidence: 73%

The Retinotopic Organization of the Human Middle Temporal Area MT/V5 and Its Cortical Neighbors

Kolster¹,

Peeters²,

Orban³

2010

Journal of Neuroscience

342

411

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Although there is general agreement that the human middle temporal (MT)/V5ϩ complex corresponds to monkey area MT/V5 proper plus a number of neighboring motion-sensitive areas, the identification of human MT/V5 within the complex has proven difficult. Here, we have used functional magnetic resonance imaging and the retinotopic mapping technique, which has very recently disclosed the organization of the visual field maps within the monkey MT/V5 cluster. We observed a retinotopic organization in humans very similar to that documented in monkeys: an MT/V5 cluster that includes areas MT/V5, pMSTv (putative ventral part of the medial superior temporal area), pFST (putative fundus of the superior temporal area), and pV4t (putative V4 transitional zone), and neighbors a more ventral putative human posterior inferior temporal area (phPIT) cluster. The four areas in the MT/V5 cluster and the two areas in the phPIT cluster each represent the complete contralateral hemifield. The complete MT/V5 cluster comprises 70% of the motion localizer activation. Human MT/V5 is located in the region bound by lateral, anterior, and inferior occipital sulci and occupies only one-fifth of the motion complex. It shares the basic functional properties of its monkey homolog: receptive field size relative to other areas, response to moving and static stimuli, as well as sensitivity to three-dimensional structure from motion. Functional properties sharply distinguish the MT/V5 cluster from its immediate neighbors in the phPIT cluster and the LO (lateral occipital) regions. Together with similarities in retinotopic organization and topological neighborhood, the functional properties suggest that MT/V5 in human and macaque cortex are homologous.

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Section: General Features Of the Mt/v5 Clustersupporting

confidence: 73%

The Retinotopic Organization of the Human Middle Temporal Area MT/V5 and Its Cortical Neighbors

Kolster¹,

Peeters²,

Orban³

2010

Journal of Neuroscience

342

411

View full text Add to dashboard Cite

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“…For the ROI localizer session, the stimulus was a flickering (10 Hz) radial checkerboard annulus, presented around fixation and scaled following the linear cortical magnification factor (Qiu et al, 2006). The annulus always had an inner radius of 1°, while the outer radius changed between 3.3°(corresponding to the full width of the Gabor stimuli in the experiment at half maximum contrast) and 5.5°.…”

Section: Roi Localizersmentioning

confidence: 99%

Visual short-term memory: Activity supporting encoding and maintenance in retinotopic visual cortex

et al. 2012

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“…Specifically, for each hemisphere of each subject, cortical surfaces were read into a custom (Qiu et al, 2006) MatLab implementation of the Dijkstra algorithm for computing distances on a convoluted surface (Dijkstra, 1959). We defined pairs of vertices such that each pair contained a vertex along the dorsal boundary of V1 and a corresponding point along the ventral boundary.…”

Section: Retinotopic Mappingmentioning

confidence: 99%

Human Adult Cortical Reorganization and Consequent Visual Distortion

et al. 2007

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Neural and behavioral evidence for cortical reorganization in the adult somatosensory system after loss of sensory input (e.g., amputation) has been well documented. In contrast, evidence for reorganization in the adult visual system is far less clear: neural evidence is the subject of controversy, behavioral evidence is sparse, and studies combining neural and behavioral evidence have not previously been reported. Here, we report converging behavioral and neuroimaging evidence from a stroke patient (B.L.) in support of cortical reorganization in the adult human visual system. B.L.'s stroke spared the primary visual cortex (V1), but destroyed fibers that normally provide input to V1 from the upper left visual field (LVF). As a consequence, B.L. is blind in the upper LVF, and exhibits distorted perception in the lower LVF: stimuli appear vertically elongated, toward and into the blind upper LVF. For example, a square presented in the lower LVF is perceived as a rectangle extending upward. We hypothesized that the perceptual distortion was a consequence of cortical reorganization in V1. Extensive behavioral testing supported our hypothesis, and functional magnetic resonance imaging (fMRI) confirmed V1 reorganization. Together, the behavioral and fMRI data show that loss of input to V1 after a stroke leads to cortical reorganization in the adult human visual system, and provide the first evidence that reorganization of the adult visual system affects visual perception. These findings contribute to our understanding of the human adult brain's capacity to change and has implications for topics ranging from learning to recovery from brain damage.

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Estimating linear cortical magnification in human primary visual cortex via dynamic programming

Cited by 73 publications

References 51 publications

The Retinotopic Organization of the Human Middle Temporal Area MT/V5 and Its Cortical Neighbors

The Retinotopic Organization of the Human Middle Temporal Area MT/V5 and Its Cortical Neighbors

Visual short-term memory: Activity supporting encoding and maintenance in retinotopic visual cortex

Human Adult Cortical Reorganization and Consequent Visual Distortion

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