Language is infinitely productive because syntax defines dependencies between grammatical categories of words and constituents, so there is interchangeability of these words and constituents within syntactic structures. Previous laboratory-based studies of language learning have shown that complex language structures like hierarchical center…

Primary school enrolment in low-income countries has increased in recent years. The quality of education is, however, still a cause for concern. Better measurement of early reading progress has been suggested as a means of improving education quality. Benchmarks based on the number of 'words per minute' (WPM) students are able to read correctly…