Acoustic Analysis of Persian Vowels in Cochlear Implant Users: A Comparison With Hearing-impaired Children Using Hearing Aid and Normal-hearing Children

About 1 year after implantation, the formants shift closer to those of the NH listeners who tend to have more expanded vowel spaces than hearing-impaired listeners with hearing aids. Probably, this condition is because CI has a subtly positive impact on the place of articulation of vowels.