Pelli and Tillman's results show that letter-by-letter decoding, or phonics, is the dominant reading process, accounting for 62 percent of reading speed. However, both holistic word recognition (16 percent) and whole-language processes (22 percent) do contribute substantially to reading speed. Remarkably, the results show that the contributions of these three processes to reading speed are additive. The contribution of each process to reading speed is the same whether the other processes are working or not.
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