Trends in Cognitive Sciences
The visual word form area: expertise for reading in the fusiform gyrus
Section snippets
Perceptual expertise underlying visual word recognition
Literate adults possess a special form of visual expertise that allows their visual system to process words efficiently. Within less than 250 ms of viewing a written word, the visual system extracts the information needed to identify its linguistic significance, despite wide variations in print, script, font, size and retinal position. Several lines of cognitive evidence indicate that the perceptual mechanisms that support word recognition rest on a critical process that groups the letters of a
Spatial localization
Numerous neuroimaging studies have provided converging evidence in support of a central finding: Perception of visual words and pseudowords reliably activates the left fusiform gyrus to a greater degree than other highly similar control stimuli. Although early neuroimaging efforts produced various estimates for the localization of visual word form activity (for a review, see [7]), more recent experiments demonstrate reliable activation for words, versus stimuli that control for visual
Response properties of the VWFA
Now that this region can be reliably identified and repeatedly probed under different experimental contrasts, it is possible to address questions concerning the nature of the associated cognitive operations by investigating the response properties of this region. Such research has demonstrated several fundamental characteristics of the response properties of the VWFA that are relevant for establishing its operational role in visual word perception.
Origins of the VWFA specialization
Taken together, the response properties of the VWFA are largely consistent with a proposed level of perceptual processing in word recognition that constructs an abstract representation of letters sequenced into word forms [28]. But how did this area of the visual system evolve to have response properties that show specific sensitivity to invariant and abstract properties of a class of stimuli that never existed before the relatively recent invention of alphabetic writing systems? In addressing
Conclusions and future directions
We started this article with a paradox: how can reading – a recent cultural invention – rely on a cerebral substrate that is tuned to the abstract properties of a class of stimuli that did not exist for most of human evolution? The hypothesis of a progressive specialization of the left VWFA over the course of reading acquisition avoids problems inherent to the notion of a ready-made ‘word recognition module’. The similarity between reading and other forms of acquired visual expertise emphasizes
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