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Medientyp:
E-Artikel
Titel:
Place specificity of multiple auditory steady-state responses
Beteiligte:
Herdman, Anthony T.;
Picton, Terence W.;
Stapells, David R.
Erschienen:
Acoustical Society of America (ASA), 2002
Erschienen in:
The Journal of the Acoustical Society of America, 112 (2002) 4, Seite 1569-1582
Sprache:
Englisch
DOI:
10.1121/1.1506367
ISSN:
0001-4966;
1520-8524
Entstehung:
Hochschulschrift:
Anmerkungen:
Beschreibung:
<jats:p>Auditory steady-state responses (ASSRs) were elicited by simultaneously presenting multiple AM (amplitude-modulated) tones with carrier frequencies of 500, 1000, 2000, and 4000 Hz and modulation frequencies of 77, 85, 93, and 102 Hz, respectively. Responses were also evoked by separately presenting single 500- or 2000-Hz AM tones. The objectives of this study were (i) to determine the cochlear place specificity of single and multiple ASSRs using high-pass noise masking and derived-band responses, and (ii) to determine if there were any differences between single- and multiple-stimulus conditions. For all carrier frequencies, derived-band ASSRs for 1-octave-wide derived bands ranging in center frequency from 0.25 to 8 kHz had maximum amplitudes within a 12 octave of the carrier frequency. For simultaneously presented AM tones of 500, 1000, 2000, and 4000 Hz, bandwidths for the function of derived-band ASSR amplitude by derived-band center frequency were 476, 737, 1177, and 3039 Hz, respectively. There were no significant differences when compared to bandwidths of 486 and 1371 for ASSRs to AM tones of 500 or 2000 Hz presented separately. Results indicate that ASSRs to moderately intense stimuli (60 dB SPL) reflect activation of reasonably narrow cochlear regions, regardless of presenting AM tones simultaneously or separately.</jats:p>