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Scientists in the UK have conducted an eye-tracking study on 90 adults to determine if Bionic Reading—a technique that bolds the initial letters of words—can actually improve reading speed and comprehension. The study, published in Royal Society Open Science, revealed some interesting findings.

The researchers found that bolding word beginnings did shift participants' initial gaze toward the start of longer words, but it did not make them read any faster. Bolding the first letters of words also did not reduce the amount of time readers spent on each word or entire sentence. In fact, longer words were read more slowly when bolded, indicating that the technique did not provide a speed advantage.

While participants were able to answer comprehension questions correctly about 95% of the time, there was no reliable evidence that bolding helped with understanding the text. The study did find that some readers preferred the bolded format, but overall, it did not improve reading performance.

Despite some limitations, such as only testing a single font and the specific way Bionic Reading is implemented, the researchers suggest that bolding word beginnings could help skilled readers to more easily identify important words. However, the findings do not suggest that Bionic Reading offers a significant speed or comprehension boost for the average reader.