Only in Breton 34
What this means for learners
Breton and Mambila share 32 sounds — roughly 48% of Mambila's inventory overlaps with Breton. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 11 sounds found only in Mambila represent the greatest pronunciation challenge for Breton 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, Breton has 34 sounds not used in Mambila. Native Mambila speakers learning Breton 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.