31 research outputs found
Witthoft, Winawer, Eagleman 2015: Learned Pairings in Synesthesia
No full text<p>This repository contains all the data and code to recreate the analyses in Witthoft, Winawer, and Eagleman (2015). Prevalence of Learned Grapheme-Color Pairings in a Large Online Sample of Synesthesia. PLoS One.</p>
Experience and perception
Get PDFThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 2007.Includes bibliographical references (leaves 114-123).To what extent can experience shape perception? In what ways does perception vary across people or even within the same person at different times? This thesis presents three lines of research examining the role of experience on perception. The first section presents evidence from synesthesia suggesting that learning can influence letter-synesthesia pairings and that associative learning can affect relatively early visual processing. The second section examines the role of linguistic categorization in color judgments, finding that language can play an online role even in a relatively simple color discrimination task. The final section examines how perception adjusts over relatively short time scales using face adaptation. The adaptation experiments show that adaptation to faces can improve recognition performance on famous faces. The results further demonstrate that these effects can be obtained without extensive training and that contrary to proposals from experiments using face spaces, that identity based adaptation effects can be found on trajectories which do not pass through the average face.by Nathan Witthoft.Ph.D
Russian Blues
No full textMaterials associated with the publication:
Winawer J, Witthoft N, Frank M , Wu L, Wade A, Boroditsky L. (2007) The Russian Blues reveal effects of language on color discrimination. Proceedings of the National Academy of Science, 104:7780-7785. https://dx.doi.org/10.1073/pnas.070164410
Identification of the ventral occipital visual field maps in the human brain
No full textData and code supplement to manuscript, 'Identification of the ventral occipital visual field maps in the human brain
Identification of the ventral occipital visual field maps in the human brain [version 1; referees: 2 approved, 1 approved with reservations]
No full textThe 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 position of 4th visual field map, ‘hV4’, is identified with less consistency in the neuroimaging literature. Using magnetic resonance imaging data, we describe landmarks to help identify the position and borders of ‘hV4’. The data consist of anatomical images, visualized as cortical meshes to highlight the sulcal and gyral patterns, and functional data obtained from retinotopic mapping experiments, visualized as eccentricity and angle maps on the cortical surface. Several features of the functional and anatomical data can be found across nearly all subjects and are helpful for identifying the location and extent of the hV4 map. The medial border of hV4 is shared with the posterior, ventral portion of V3, and is marked by a retinotopic representation of the upper vertical meridian. The anterior border of hV4 is shared with the VO-1 map, and falls on a retinotopic representation of the peripheral visual field, usually coincident with the posterior transverse collateral sulcus. The ventro-lateral edge of the map typically falls on the inferior occipital gyrus, where functional MRI artifacts often obscure the retinotopic data. Finally, we demonstrate the continuity of retinotopic parameters between hV4 and its neighbors; hV4 and V3v contain iso-eccentricity lines in register, whereas hV4 and VO-1 contain iso-polar angle lines in register. Together, the multiple constraints allow for a consistent identification of the hV4 map across most human subjects
Deos the Bairn Not Raed Ervey Lteter by Istlef, but the Wrod as a Wlohe?
No full textIn this issue of Neuron, Glezer et al. find higher sensitivity to changes in real words than pseudowords in the left visual word form area (VWFA). Here we discuss the implications of their findings and the constraints they impose on neural coding in the lVWFA
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Transfer of gender aftereffects in face silhouettes reveal face-specific mechanisms
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