David Roberts’s research while affiliated with Independent Researcher and other places

The shorter a word, the more likely it is to be lexically ambiguous. In the toneless standard orthography of Kabiye, a language of Togo, numerous monosyllabic heterophonic homographs (tonal minimal pairs) and homophonic homographs occur in the imperative and six associated conjugations. This paper presents the complete catalogue of these verbs, and then examines them in natural contexts. It goes on to propose a morphographic spelling in which elided root-final labial consonants are written as superscript silent letters to help the reader identify the lexeme. This spelling is tested against a diacritic tonographic alternative in an oral reading experiment. The results show that those who learnt the morphographic spelling gained more in reading accuracy than those who learnt the tonographic spelling.

The experiment reported here tests the Lexical Orthography Hypothesis, that is, the notion that the output of the lexical phonology is the most promising phonological depth for an exhaustive representation of tone by means of diacritics in the orthography of a tone language. We conducted a controlled classroom experiment with 97 secondary school pupils learning written Kabiye, a Gur language of northern Togo. After testing their baseline skills in writing the standard orthography, the pupils participated in an eleven-hour transition course spread over three weeks in four parallel groups: Deep (an experimental orthography representing the input of the lexical phonology), Lexical (representing the output of the lexical phonology), Phonemic (representing a level between the output of the lexical phonology and the output of the post-lexical phonology), and a control group. On the final day of the experiment, we tested their acquired skills in a dictation exercise. The results show that the Lexical group outperforms the other groups in three of the error types associated with adding diacritics, although they performed less well on the error type associated with writing long vowels. This initial evidence supporting the Lexical Orthography Hypothesis needs confirmation with reading and writing experiments on a variety of other tone languages.

Some orthographies represent tone phonemically by means of diacritics; others favor zero marking. Neither solution is entirely satisfactory. The former leads to graphic overload; the latter to a profusion of homographs; both may reduce fluency. But there is a ‘third way’: to highlight the grammar rather than the tone system itself. To test this approach, we developed two experimental strategies for Kabiye: a grammar orthography and a tone orthography. Both are modifications of the standard orthography that does not mark tone. We tested these in a quantitative experiment involving literate L1 speakers that included dictation and spontaneous writing. Writers of the grammar orthography perform faster and more accurately than writers of the tone orthography, suggesting that they have an awareness of the morphological and syntactic structure of their language that may exceed their awareness of its phonology. This suggests that languages with grammatical tone might benefit from grammatical markers in the orthography. Keywords: tone; grammar; orthography; African languages; quantitative experiment