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Brain's 'Visual Dictionary' Enables Skilled
Skilled readers can recognize words at lightning fast speed when they read because the word has been placed in a sort of visual dictionary, say Georgetown University Medical Center (GUMC) neuroscientists. The visual dictionary idea rebuts the theory that our brain “sounds out” words each time we see them.
“One camp of neuroscientists believes that we access both the phonology and the visual perception of a word as we read them and that the area or areas of the brain that do one, also do the other, but our study proves this isn’t the case,” says the study’s lead investigator, Laurie Glezer, Ph.D., a postdoctoral research fellow. She works in the Laboratory for Computational Cognitive Neuroscience at GUMC, led by Maximilian Riesenhuber, Ph.D., who is a co-author.
“What we found is that once we’ve learned a word, it is placed in a purely visual dictionary in the brain. Having a purely visual representation allows for the fast and efficient word recognition we see in skilled readers,” she says. “This study is the first demonstration of that concept.”
Glezer and her co-authors tested word recognition in 12 volunteers using fMRI. They were able to see that words that are different, but sound the same (like “hare” and “hair”) activate different neurons, akin to accessing different entries in a dictionary’s catalogue. “If the sounds of the word had influence in this part of the brain we would expect to see that they activate the same or similar neurons, but this was not the case; ‘hair’ and ‘hare’ looked just as different as ‘hair’ and ‘soup’. This suggests that all we use is the visual information of a word and not the sounds.”
“When we see a word for the first time, it requires some time to read and sound it out, but after perhaps just one presentation of the word, you can recognize it without sounding it out,” she says. “This occurs because our brain first uses phonology to encode the word and match the sound with the written word. Once we do that and encounter the word a few more times, we no longer need the phonology at first, just the visual input to identify the word.”
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