An adult cochlear-implant user reports that speech sounds audible but unclear. Thresholds confirm sounds are detected, but you want objective evidence about whether spectral contrasts are resolved. You present a continuous stimulus that changes vowel partway through and look for an acoustic change complex.
Findings
A second onset-like response is time-locked to the mid-stimulus vowel change — an acoustic change complex.
Diagnostic question
What does the present acoustic change complex demonstrate here?