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In typography, a bouma (/ˈboʊmə/ BOH-mə) is the shape of a cluster of letters, often a whole word. It is a reduction of "Bouma-shape", which was probably first used in Paul Saenger's 1997 book Space between Words: The Origins of Silent Reading, although Saenger himself attributes it to Insup & Maurice Martin Taylor. Its origin is in reference to hypotheses by the prominent vision researcher Herman Bouma, who studied the shapes and confusability of letters and letter strings.[1]
Some typographers believe that, when reading, people can recognize words by deciphering boumas, not just individual letters, or that the shape of the word is related to readability and/or legibility. The claim is that this is a natural strategy for increasing reading efficiency. However, considerable study and experimentation by cognitive psychologists led to their general acceptance of a different, and largely contradictory, theory by the end of the 1980s: parallel letterwise recognition.[2] Since 2000, parallel letterwise recognition has been more evangelized to typographers by Microsoft's Dr Kevin Larson, via conference presentations and a widely read article.[3] Nonetheless, ongoing research (starting from 2009) often supports the bouma model of reading.[4]
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