Nigerian Sign LanguagePrint
Western (Lagos), Southern/southeastern (Imo state). Related to American Sign Language (ASL) [ase] and Ghanaian Sign Language [gse]. Influence from spoken English [eng]. Incorporates many local and regional signs, enough that Nigerian Sign Language is now distinct from ASL (2015 E. Asonye). Incorporation of regional signs results in significant dialect differences between western Nigeria (Lagos and vicintiy) vs. southern/southeastern regions, such as three Deaf schools in Imo state (2015 E. Asonye).
Originated in 1960, developing out of Deaf schools established by Deaf American educator Andrew Foster. Some classes in NSL for parents of deaf children (2015 E. Asonye).