scholarly journals Frequency matching of vocalizations to inner-ear sensitivity along an altitudinal gradient in the coqui frog

2009 ◽  
Vol 6 (2) ◽  
pp. 278-281 ◽  
Author(s):  
Sebastiaan W. F. Meenderink ◽  
Mirja Kits ◽  
Peter M. Narins
Keyword(s):  
Body Size ◽  
Inner Ear ◽  
Sea Level ◽  
Otoacoustic Emissions ◽  
Altitudinal Gradient ◽  
Distortion Product Otoacoustic Emissions ◽  
Frequency Range ◽  
Frequency Matching ◽  
Distortion Product ◽  
Sensitivity Change

Acoustic communication involves both the generation and the detection of a signal. In the coqui frog ( Eleutherodactylus coqui ), it is known that the spectral contents of its calls systematically change with altitude above sea level. Here, distortion product otoacoustic emissions are used to assess the frequency range over which the inner ear is sensitive. It is found that both the spectral contents of the calls and the inner-ear sensitivity change in a similar fashion along an altitudinal gradient. As a result, the call frequencies and the auditory tuning are closely matched at all altitudes. We suggest that the animal's body size determines the frequency particulars of the call apparatus and the inner ear.

The relationship between tinnitus pitch and parameters of audiometry and distortion product otoacoustic emissions

2017 ◽  
Vol 131 (11) ◽  
pp. 1017-1025 ◽  
Author(s):  
H Keppler ◽  
S Degeest ◽  
I Dhooge
Keyword(s):  
Hearing Loss ◽  
Otoacoustic Emissions ◽  
Otoacoustic Emission ◽  
Homeostatic Plasticity ◽  
Distortion Product Otoacoustic Emissions ◽  
Chronic Tinnitus ◽  
Distortion Product Otoacoustic Emission ◽  
Frequency Range ◽  
Distortion Product ◽  
The Relationship

AbstractObjectives:Chronic tinnitus is associated with reduced auditory input, which results in changes in the central auditory system. This study aimed to examine the relationship between tinnitus pitch and parameters of audiometry and distortion product otoacoustic emissions. For audiometry, the parameters represented the edge frequency of hearing loss, the frequency of maximum hearing loss and the frequency range of hearing loss. For distortion product otoacoustic emissions, the parameters were the frequency of lowest distortion product otoacoustic emission amplitudes and the frequency range of reduced distortion product otoacoustic emissions.Method:Sixty-seven patients (45 males, 22 females) with subjective chronic tinnitus, aged 18 to 73 years, were included.Results:No correlation was found between tinnitus pitch and parameters of audiometry and distortion product otoacoustic emissions. However, tinnitus pitch fell mostly within the frequency range of hearing loss.Conclusion:The current study seems to confirm the relationship between tinnitus pitch and the frequency range of hearing loss, thus supporting the homeostatic plasticity model.

Otoacoustic emissions in patients with hypotension

2003 ◽  
Vol 117 (4) ◽  
pp. 265-269 ◽  
Author(s):  
Dimitrios G. Balatsouras ◽  
Stavros Korres ◽  
Nikola Simaskos ◽  
Dimitrios Kandiloros ◽  
Eleftherios Ferekidis ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Hearing Loss ◽  
Systolic Blood Pressure ◽  
Otoacoustic Emissions ◽  
Distortion Product Otoacoustic Emissions ◽  
Frequency Range ◽  
Distortion Product ◽  
Cochlear Damage ◽  
Lower Frequency Range ◽  
Age And Sex

The aim of this study was to investigate the relation between hypotension and slowly developing hearing impairment, using otoacoustic emissions. A group of 42 patients was examined, with diastolic blood pressure ≤60 mmHg and systolic blood pressure ≤105 mmHg. The subjects underwent biochemical, cardiological, ENT and audiological examinations. Distortion product otoacoustic emissions (DPOAE) were recorded in the format of DP-gram. The results were compared to the data of 30 normal persons of similar age and sex, examined at the same laboratory. Audiometric results showed that 18 patients had mild or moderate symmetrical hearing loss in one or more frequencies, mainly in the lower frequency range. DPOAE of the patients had reduced amplitude as compared to controls or were even absent, in one or more frequencies. It may be concluded that a hypotensive condition could be a possible factor in the origin of cochlear damage and DPOAE may be useful in monitoring hypotensive patients.

scholarly journals Behavioural tuning in a tropical amphibian along an altitudinal gradient

2017 ◽  
Vol 13 (12) ◽  
pp. 20170317 ◽  
Author(s):  
Sebastiaan W. F. Meenderink ◽  
Patricia M. Quiñones ◽  
Peter M. Narins
Keyword(s):  
Inner Ear ◽  
Sea Level ◽  
Altitudinal Gradient ◽  
Behavioural Response ◽  
Advertisement Call ◽  
Vocal Response ◽  
Vocal Responses ◽  
Response Behaviour ◽  
Altitude Dependence ◽  
Sensitivity Change

Males of the coqui treefrog, Eleutherodactylus coqui , produce a distinct two-note ‘co-qui' advertisement call from sunset to midnight throughout most of the year. Previous work established that both the spectrotemporal aspects of the call and the frequency of highest inner-ear sensitivity change with altitude above sea level. These variations are such that the frequency of the emitted co-note closely matches the frequency to which the inner ear is most sensitive. Given this parallel variation, we expected that the call-evoked behavioural response of male coqui treefrogs would also show an altitude dependence, and hypothesized that males would produce their most robust acoustical territorial response to advertisement calls that match calls from their own altitude. We tested this hypothesis in the field by studying the vocal response behaviour of coquis to playbacks of synthetic, altitude-dependent conspecific calls, and indeed found that the most robust vocal responses were obtained using stimuli closely matching the calls from the same altitude.

scholarly journals Estimation of outer hair cells function in chronic bilateral tinnitus patients with normal hearing using distortion product otoacoustic emissions

2021 ◽  
Author(s):  
Aras Karimiani ◽  
Nematollah Rouhbakhsh ◽  
Farzaneh Zamiri Abdollahi ◽  
Shohreh Jalaie
Keyword(s):  
Hair Cells ◽  
Otoacoustic Emissions ◽  
Normal Hearing ◽  
Outer Hair Cells ◽  
Distortion Product Otoacoustic Emissions ◽  
Control Group ◽  
Distortion Product Otoacoustic Emission ◽  
Frequency Range ◽  
Cochlear Function ◽  
Distortion Product

Background and Aim: It is not clear if the measurement of distortion product otoacoustic emissions (DPOAE) at frequencies above 8 kHz adds any value in determining the differences in the cochlear function between patients with and without tinnitus. This study aimed to compare DPOAE in the frequency range of 0.5−10 kHz in patients with normal hearing with and without tinnitus. Methods: This comparative cross-sectional study was conducted on 20 individuals with tinnitus and normal hearing as a study group (SG) and a control group (CG) of 20 normal-hearing individuals without tinnitus. The DPOAE was measured with F1/F2 = 1.22 and intensities of F1 = 65 dB SPL and F2 =55 dB SPL in the frequency range of 0.5−10 kHz, moreover in the frequency of tinnitus in SG and corresponding frequency in CG. Results: DPOAE level at 10 kHz did not differ significantly between SG and CG (p = 0.491). However, the mean of overall DPOAE level, DPOAE level at the frequency of tinnitus, and F2 values of 2.5, 5, and 6.298 kHz were significantly lower in SG than CG (p < 0.05). Conclusion: Measurement of DPOAE at 10 kHz did not seem to add any value in determining the differences in the cochlear function between patients with and without tinnitus. However, decreased DPOAE levels at 2.5, 5, and 6.298 kHz which were observed among patients who have tinnitus and normal hearing, indicates some outer hair cells damage that was not detectable by conventional audiometry. Keywords: Tinnitus; normal hearing; outer hair cell; distortion product otoacoustic emission

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