
Contents
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Letter Perception and Word Reading Letter Perception and Word Reading
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Supraletter Perceptual Units Supraletter Perceptual Units
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The Contribution of Individual Letters to Reading The Contribution of Individual Letters to Reading
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Cerebral Selectivity for the Visual Perception of Letters Cerebral Selectivity for the Visual Perception of Letters
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Selectivity for Letter Strings or Word Forms Selectivity for Letter Strings or Word Forms
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Selectivity for Single Letters Selectivity for Single Letters
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Interaction with Other Cognitive Systems Interaction with Other Cognitive Systems
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Interactions with the Linguistic System Interactions with the Linguistic System
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Sensorimotor Interactions Sensorimotor Interactions
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The Perceptual Specificities of Letters The Perceptual Specificities of Letters
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Spatiotemporal Properties Spatiotemporal Properties
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Co-occurrence Co-occurrence
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Regularity in Orientation Regularity in Orientation
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Regularity in Font Regularity in Font
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Task Demand Task Demand
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Generalization across Cases Generalization across Cases
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Resolution Demand Resolution Demand
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Constraints from a Fixed Letter Set Constraints from a Fixed Letter Set
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Conclusion Conclusion
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References References
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10 10 The Case for Letter Expertise
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Published:November 2009
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Abstract
The perception of single letters is a critical component of reading, as evidenced by deficits in letter perception in individuals with dyslexia. Thus, visual letter recognition is a type of perceptual expertise, but it differs from face-like perceptual expertise in several important ways based on different perceptual and task demands. For example, relative to faces, letters are less visually complex and are recognized at the basic rather than subordinate level. However, as with face-like perceptual expertise, our extensive experience with letters leads to behavioral effects not observed for other objects (e.g. orientation priming) and neural specificity. Letter perception and word perception each recruit selective neural substrates that are left-lateralized, perhaps because of the relationship between letters, words, and language. Letter perception can also recruit motor cortices, depending on writing experience.
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