josé juan barajas de prat clinica barajas, universidad de la laguna, fundación dr. barajas santa...
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José Juan Barajas de Prat
Clinica Barajas, Universidad de La Laguna, Fundación Dr. Barajas
SANTA CRUZ DE TENERIFE - CANARY ISLANDS - SPAIN
Universidad de La Laguna
IAPA 2010 Symposium 19-22 September, Krakow, Poland
Loudness and Auditory Steady State Responses
CATEGORICAL CATEGORICAL LOUDNESS SCALINGLOUDNESS SCALING
AUDITORY BRAINSTEMAUDITORY BRAINSTEM RESPONSESRESPONSES
Serpanos (1997)
Relationship between Loudness Relationship between Loudness Intensity Functions and the Click-Intensity Functions and the Click-
ABR Wave V LatencyABR Wave V Latency
Frequency SpecificFrequency Specific
Fast Fast
Objective Objective
AUDITORY STEADY-STATEAUDITORY STEADY-STATE
RESPONSESRESPONSES
Acoustic Stimuli: AM Tones.5, 1, 2 & 4 Khz.70 dB nHL - Threshold
ASSRs RECORDING ASSRs RECORDING PROCEDUREPROCEDURE
Amplifier: Low Cut: 20 HzHigh Cut: 300 HzGain: 100 000Notch: On
Electrode Arrangement: Non-inverted: CzInverted:1MGround: forehead
Impedance < 5k
CONTOUR TESTCONTOUR TESTLOUDNESS CATEGORIES
7. 7. Uncomfortably LoudUncomfortably Loud
6. Loud, but O.K.6. Loud, but O.K.
5. Comfortable, but Slightly Loud5. Comfortable, but Slightly Loud
4. Comfortable4. Comfortable
3. Comfortable, but Slightly Soft3. Comfortable, but Slightly Soft
2. Soft2. Soft
1. Very Soft1. Very Soft
Cox, Robyn M.; Alexander, Genevieve C.; Taylor, Izel M.; Gray, Ginger A. Cox, Robyn M.; Alexander, Genevieve C.; Taylor, Izel M.; Gray, Ginger A. The The Contour Test of Loudness PerceptionContour Test of Loudness Perception. Ear & Hearing: Volumen 18(5) . Ear & Hearing: Volumen 18(5) October 1997 pp388-400.October 1997 pp388-400.
ASSR Recordings Loudness Growth Function
500 Hz
1000 Hz
2000 Hz
4000 Hz
Intensity (dB HL)
Lo
ud
nes
s C
ateg
ory
Loudness Growth Loudness Growth FunctionFunction
Am
pli
tud
e (n
V)
Intensity (dB HL)
ASSR Amplitude-Intensity ASSR Amplitude-Intensity functionfunction
Am
pli
tud
e (n
V)
Intensity (dB HL)
ASSR Amplitude-Intensity ASSR Amplitude-Intensity functionfunction
500 Hz
Am
pli
tud
e (u
V)
Intensity (dB HL)
ASSR Amplitude-Intensity ASSR Amplitude-Intensity functionfunction
500 Hz
1000 Hz
Am
pli
tud
e (n
V)
Intensity (dB HL)
ASSR Amplitude-Intensity ASSR Amplitude-Intensity functionfunction
1000 Hz
500 Hz
1000 Hz
2000 Hz
Am
pli
tud
e (n
V)
Intensity (dB HL)
ASSR Amplitude-Intensity ASSR Amplitude-Intensity functionfunction
500 Hz
1000 Hz
2000 Hz
4000 Hz
Linear regression Linear regression analysisanalysis
.5 kHz.5 kHz 1 kHz1 kHz 2 kHz2 kHz 4 kHz4 kHz TotalTotal
Y InterceptY Intercept 1.86 1.53 1.41 1.42 1.55
SlopeSlope 12.26 32.13 28.07 27.46 24.9
Correlation Correlation coefficient (R)coefficient (R)
0.47** 0.45** 0.52** 0.68** 0.49**
Standard error Standard error
of estimateof estimate
1.54 1.47 1.52 1.39 1.48
** P < 0.0001** P < 0.0001
Loudness (fo) = 1.55 + 24.9 * Amplitude
PREDICTION OF LOUDNESS GROWTH FUNCTION FROM THE ASSR
Predicted Loudness (fo) = B0 + B1 * Intensity + B2 * Amplitude
Y = 0.75X0.4
Zenker Castro, Franz, Juan Barajas de Prat, Jose and Larumbe Zabala, Eneko (2008). Loudness and auditory steady-state responses in normal-hearing subjects. International Journal of Audiology, 47:5, 269 — 275.
Unconfortable Loudness Level
Unconfortable Loudness Level Objective estimation
Kiessling, Audiology, 1980 Thornton, Scand Audiol, 1989
Acoustic Reflex Auditory Brainstem Response
ULLs Measurement Procedure
500 Hz 3 kHz
Acoustical Spectrum
Electrical Waveform
500 Hz 3 kHz
ULL = 90 dB HL
ULL = 90 dB HL
ULL 500 Hz
Right ear
Left ear
ASSR Recordings
500 Hz Amplitud-Intensity function (n = 8)
3 kHz Amplitud-Intensity function (n = 8)
Inter subject average amplitude-intensity function (n = 8)
Conclusions
• High intersubject variabilty in the amplitude-intensity function was found.
• ULL prediction based solely on individual ASSR amplitude-intensity function proved to be problematic.
THANK YOUTHANK YOU
Universidad de La Laguna
Loudness and Loudness and Auditory Steady State Auditory Steady State
ResponsesResponsesJosé Juan Barajas de Prat
Clinica Barajas, Universidad de La Laguna, Fundación Dr. Barajas
SANTA CRUZ DE TENERIFE - CANARY ISLANDS - SPAIN