Figures for Chapter 15 Special issues for children Dillon (2001) Hearing Aids

Figure 15.1 A Huggie Aid TM attached to a BTE hearing aid. Aid retention Source: Dillon (2001): Hearing Aids

Figure 15.2 Cross section of a hollow-concha earmold. Hollow-concha earmold Source: Dillon (2001): Hearing Aids

Figure 15.3 Typical length of the ear canal as a function of age (Keefe et al, 1994). Solid line is a smooth curve fitted to the data and dashed line shows the average length of the adult ear canal (Keefe et al., 1994; Salvinelli et al., 1991). Ear canal length Source: Dillon (2001): Hearing Aids

Figure 15.4 The increase in SPL generated by a hearing aid in an average child's ear relative to that in an average adult's ear. Children are aged from 1 to 48 months, as indicated for each curve. RECD relative to adults Source: Dillon (2001): Hearing Aids

Too loud Loud Just right ? Too soft Figure 15.5 Verbal and pictorial loudness categories used for evaluation of loudness comfort and discomfort while wearing hearing aids. Loudness discomfort rating scale Source: Dillon (2001): Hearing Aids

Development of expressive and receptive language Hearing aids are fitted early and well Hearing aids are consistently used Hearing aids continue to operate properly Child receives stimulating auditory input Parents have good understanding and are highly motivated Figure 15.6 Goals of the hearing habilitation process, culminating in maximal development of language. Habilitation goals Source: Dillon (2001): Hearing Aids