Table 3.
Average (SD) vowel space area in mels squared and vowel space dispersion in mels for infant-directed (ID) and adult-directed (AD) speech to participants with hearing impairment fitted with cochlear implants (HI-CI, Study1) or hearing aids (HI-HA, Study 2), their chronological-age matches with normal hearing (NH-CAM), and their hearing-experience matches with normal hearing (NH-HEM).
| Variable | Hearing status | AD | ID |
|---|---|---|---|
| Study 1 | |||
| Area | HI-CI | 54878 (32496) | 82922 (41161) |
| NH-CAM | 63672 (31090) | 79326 (35213) | |
| NH-HEM | 52730 (23493) | 79213 (36981) | |
| All | 57094 (28769) | 80487 (36707) | |
| Dispersion | HI-CI | 330 (31) | 336 (35) |
| NH-CAM | 322 (33) | 333 (34) | |
| NH-HEM | 309 (32) | 342 (32) | |
| All | 337 (33) | 320 (32) | |
| Study 2 | |||
| Area | HI-HA | 45159 (19952) | 62913 (21529) |
| NH-CAM | 58609 (14510) | 61842 (14207) | |
| NH-HEM | 48914 (13235) | 74872 (43906) | |
| All | 50894 (16264) | 66542 (28277) | |
| Dispersion | HI-HA | 307 (23) | 349 (43) |
| NH-CAM | 329 (19) | 315 (18) | |
| NH-HEM | 310 (22) | 347 (31) | |
| All | 315 (23) | 337 (34) | |