Cullington, H.E.

Hacking, C.R.

English

Southampton (e-Prints Soton)

Loudness scaling and the acoustic reflexin adult cochlear implant usersCullington H E and Hacking C R, Institute of Sound and Vibration ResearchUniversity of Southampton, UKEART measurements were attempted on 6 channels for 16 CI patients.  Those with present reflexes took part in loudness scaling procedures on the same channels. To examine the relationship between the electrically-evoked acoustic reflex threshold (EART) and loudness in adult CI usersPrevious research has shown the EART to be a valuable tool for objectively programming the cochlear implant (Battmer et al, 1990; Spivak and Chute, 1994; Van den Borne et al, 1994; Shallop and Ash, 1995; Hodges et al, 1997)Reflex Incidence  EART<ULL63% 93%Strong linear association between EART and loudness perception for most electrodes and most loudness categoriesAimMethodResultsConclusionThe EART provides information for objectively programming a cochlear implant.It rarely exceeds the ULL and is well correlated with loudness perception.Loudness scalingVery softSoftOKLoudVery loudToo loudReflex threshold closest to “loud” category in most casesLoudness category closest to the EART 0510152025V soft Soft OK Loud V loud Too loudLoudness categoryNo. of patientsRelationship between the "soft" level and the EART - apical electrode140150160170180190200210220120 140 160 180 200 220Mean level of the "soft" category (current units)EART (current units)r = 0.875Universityof Southampton

Loudness scaling and the acoustic reflex in adult cochlear implant users

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