scholarly journals Association of Auditory Steady State Responses with Perception of Temporal Modulations and Speech in Noise

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Venugopal Manju ◽  
Kizhakke Kodiyath Gopika ◽  
Pitchai Muthu Arivudai Nambi
Keyword(s):  
Steady State ◽  
Speech Perception ◽  
Amplitude Modulation ◽  
Modulation Depth ◽  
Normal Hearing ◽  
Positive Correlation ◽  
Behavioral Method ◽  
Modulation Detection ◽  
Auditory Steady State Responses ◽  
40 Hz

Amplitude modulations in the speech convey important acoustic information for speech perception. Auditory steady state response (ASSR) is thought to be physiological correlate of amplitude modulation perception. Limited research is available exploring association between ASSR and modulation detection ability as well as speech perception. Correlation of modulation detection thresholds (MDT) and speech perception in noise with ASSR was investigated in twofold experiments. 30 normal hearing individuals and 11 normal hearing individuals within age range of 18–24 years participated in experiments 1 and 2, respectively. MDTs were measured using ASSR and behavioral method at 60 Hz, 80 Hz, and 120 Hz modulation frequencies in the first experiment. ASSR threshold was obtained by estimating the minimum modulation depth required to elicit ASSR (ASSR-MDT). There was a positive correlation between behavioral MDT and ASSR-MDT at all modulation frequencies. In the second experiment, ASSR for amplitude modulation (AM) sweeps at four different frequency ranges (30–40 Hz, 40–50 Hz, 50–60 Hz, and 60–70 Hz) was recorded. Speech recognition threshold in noise (SRTn) was estimated using staircase procedure. There was a positive correlation between amplitude of ASSR for AM sweep with frequency range of 30–40 Hz and SRTn. Results of the current study suggest that ASSR provides substantial information about temporal modulation and speech perception.

The Effects of Monotic and Dichotic Interference Tones on 40 Hz Auditory Steady-State Responses in Normal-Hearing Adults

2008 ◽  
Vol 19 (02) ◽  
pp. 101-119 ◽  
Author(s):  
Shaum P. Bhagat
Keyword(s):  
Steady State ◽  
Modulation Depth ◽  
Normal Hearing ◽  
Probe Tone ◽  
Dichotic Stimulation ◽  
Frequency Specificity ◽  
Steady State Responses ◽  
Auditory Steady State Responses ◽  
State Responses ◽  
40 Hz

Auditory steady-state responses (ASSRs) recorded with simultaneous presentation of multiple tones modulated from 77–105 Hz exhibit frequency specificity and can be acquired with monotic or dichotic stimulation. This study examined the frequency specificity and dichotic characteristics of 40 Hz ASSRs recorded with amplitude-modulated (AM) probe tones and unmodulated (UM) or AM interfering tones in 27 normal-hearing adults. The effects on ASSR amplitudes of monotically or dichotically presented interfering tones of various frequency, modulation depth, and modulation rate were studied. Significant decreases in ASSR amplitudes occurred when the UM interfering tone was monotic, higher in frequency, and approximately within an octave of the probe tone. ASSR amplitudes were also reduced when the AM interfering tone was monotic and modulated at a lower depth and was an octave above the probe tone. Probe and interfering AM tones modulated at different rates produced similar reductions in amplitude for ASSRs acquired with monotic and dichotic stimulation. The findings of this study contribute to clarifying the carrier and temporal envelope interactions between tonal stimuli. Description of the effects of these stimulus parameters on 40 Hz ASSRs can benefit clinical applications of this technique, including evaluating auditory function in adults not capable of participating in behavioral audiometric tests. Las respuestas auditivas de estado estable (ASSR) registradas con una presentación simultánea de múltiples tonos modulados desde 77 a 105 Hz, exhiben especificidad frecuencial y puede ser adquiridas con estimulación monótica o dicótica. Este estudio examinó la especificidad frecuencial y las características dicóticas de las ASSR de 40 Hz registradas con sondas de prueba de amplitud modulada (AM) y con tonos de interferencia no modulados (UM), en 27 sujetos adultos normoyentes. Se estudiaron los efectos sobre las amplitudes de las ASSR producto de tonos de interferencia presentados en forma monótica o dicótica, caracterizados por diferentes frecuencias, profundidades de modulación y tasa de modulación. Ocurrieron reducciones significativas en la amplitud de las ASSR cuando el tono de interferencia UM era monótico, de frecuencia mayor, y aproximadamente dentro de una octava del tono de prueba. Las amplitudes de las ASSR también se redujeron cuando el tono de interferencia de AM era monótico y modulado a una profundidad menor y a una octava por encima del tono de prueba. Los tonos de prueba y de interferencia con AM, modulados a diferentes tasas, produjeron reducciones similares en la amplitud de las ASSR, cuando se lograban con estimulación monótica o dicótica. Los hallazgos de este estudio contribuyen a aclarar las interacciones con la envolvente temporal y la del portador, entre estímulos tonales. La descripción de los efectos de estos parámetros del estímulo sobre las ASSR de 40 Hz pueden beneficiar la aplicación clínica de esta técnica, incluyendo la evaluación de funciones auditivas en adultos no capaces de participar en pruebas audiométricas conductuales.

Confirmation of previous results of the occlusion effect through auditory steady-state responses in normal-hearing adults

2016 ◽  
Vol 22 (4) ◽  
pp. 231
Author(s):  
Alioth Guerrero-Aranda ◽  
Eleina Mijares-Nodarse ◽  
Heivet Hernandez-Perez ◽  
Alejandro Torres-Fortuny
Keyword(s):  
Steady State ◽  
Normal Hearing ◽  
Steady State Responses ◽  
Auditory Steady State Responses ◽  
Occlusion Effect ◽  
State Responses

Multiple Auditory Steady-State Responses to Bone-Conduction Stimuli in Adults with Normal Hearing

2005 ◽  
Vol 16 (03) ◽  
pp. 172-183 ◽  
Author(s):  
Susan A. Small ◽  
David R. Stapells
Keyword(s):  
Steady State ◽  
Bone Conduction ◽  
Normal Hearing ◽  
Phase Delay ◽  
Research System ◽  
Steady State Responses ◽  
Auditory Steady State Responses ◽  
State Responses ◽  
Single Versus ◽  
Air Conduction

ASSR thresholds to bone-conduction stimuli were determined in 10 adults with normal hearing using mastoid placement of the bone oscillator. ASSRs to 0–50 dB HL bone-conduction stimuli and to 30–60 dB HL air-conduction stimuli were compared. The effect of alternating stimulus polarity on air- and bone-conduction ASSRs was also investigated. Stimuli were bone- and air-conduction amplitude-modulated tones (500–4000 Hz carrier frequencies, modulated at 77–101 Hz). ASSRs were recorded using the Rotman MASTER research system. Mean (1SD) bone-conduction ASSR thresholds were 22(11), 26(13), 18(8), and 18(11) dB HL for 500, 1000, 2000, and 4000 Hz, respectively. Except for a steeper slope at 500 Hz, ASSR intensity-amplitude functions for binaural bone- and air-conduction stimuli showed the same slopes; intensity-phase-delay functions were steeper at 1000 Hz for ASSRs to bone-conduction stimuli. ASSR amplitudes and phases did not differ for single- versus alternated-stimulus polarities for both bone- and air-conduction stimuli. The steeper amplitude slope for ASSRs to 500 Hz stimuli may reflect a nonauditory contribution to the ASSR.

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