Supporting Online Material for Still no evidence for an ancient language expansion from Africa Michael Cysouw, Dan Dediu and Steven Moran email:
[email protected] Table of contents 1. Materials and Methods 1.1. Data 1.2. Measuring phoneme inventory size 1.3. Geographic distribution of phoneme inventory size 1.4. Correlation with speaker community size 1.5. Distribution over macroareas 1.6. Global clines of phoneme inventory size 1.7. Global clines of other WALS features 1.8. Searching for an origin: analysis of Atkinson’s BIC-based methodology 1.9. Software packages used 2. Supporting Text 2.1. About the term ‘phonemic diversity’ 2.2. Stability of phoneme inventory size 2.3. About the serial founder effect in human evolution and language 3. Tables 4. References 2 1. Materials and Methods 1.1. Data The linguistic parameter that Atkinson (S1) investigates is the size of the phoneme inventory of a language. Although the acoustic variation of possible linguistic utterances is basically continuous in nature, humans discretely categorize this continuous variation into distinctive groups, called phonemes. This discretization is language-specific, i.e. different languages have their own structure of distinctive groups. Empirically it turns out that some languages have more groups (i.e they divide phonetic space into more fine-grained distinctive phonemes), while other distinguish less phonemic clusters of sounds. To investigate variation in phoneme inventory size, it would have been straightforward for Atkinson to use data on the actual number of phonemic distinctions in different languages. Much of what is known about phoneme inventories is based on the UCLA Phonological Segment Inventory Database (UPSID; S2).