Two spaces after period are better than one, except maybe they aren’t, study finds

INSUBCONTINENT EXCLUSIVE:
Enlarge / Two spaces are better
Well, at least to me
(credit: Nora Karol Photography/Getty Images) In what may be one of the most controversial studies of the year, researchers at Skidmore
College—clearly triggered by a change in the American Psychological Association (APA) style book—sought to quantify the benefits of two
spaces after a period at the end of a sentence
After conducting an eye-tracking experiment with 60 Skidmore students, Rebecca L
Johnson, Becky Bui, and Lindsay L
Schmitt found that two spaces at the end of a period slightly improved the processing of text during reading
The research was trumpeted by some press outlets as a vindication of two-spacers' superiority. For anyone who learned their keyboarding
skills on a typewriter rather than a computer—and for the many who developed their keyboard muscle memory using software packages such as
Mavis Beacon Teaches Typing—the double-space after the period is a deeply ingrained truth
While modern style, based on the fallacy that computer typography makes such double-spaces redundant and Paleolithic, has demanded the
deprecation of the second tap of the space bar after a punctuation full-stop, many have openly resisted this heresy, believing that the
extra space is a courtesy to the reader and enhances the legibility of the text. Previous cognitive science research has been divided on the
issue
Some research has suggested closer spacing of the beginning of a new sentence may allow a reader to capture more characters in their
parafoveal vision—the area of the retina just outside the area of focus, or fovea—and thus start processing the information sooner
(though experimental evidence of that was not very strong)
Other prior research has inferred that an extra space prevents lateral interference in processing text, making it easier for the reader to
identify the word in focus
But no prior research found by Johnson, Bui, and Schmitt actually measured reader performance with each typographic scheme. Read 8 remaining
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