What this means for learners
Apinaye and Bamana share 27 sounds — roughly 47% of Bamana's inventory overlaps with Apinaye. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 31 sounds found only in Bamana represent the greatest pronunciation challenge for Apinaye speakers. The adult brain tends to map unfamiliar sounds onto the closest native equivalent — a process that produces the characteristic "accent" of a second-language speaker. Learning to hear and produce these sounds as distinct requires focused ear training, not just repetition.
Conversely, Apinaye has 22 sounds not used in Bamana. Native Bamana speakers learning Apinaye will face the mirror-image challenge with these sounds.
Phoneme inventories from PHOIBLE. Data reflects one documented inventory per language; some variation exists across dialects and sources.