Acoustic Reflex and Exchange Rate for White Noise Short Stimuli

1986 ◽  
pp. 613-620
Author(s):  
G. Rossi
Keyword(s):  
Exchange Rate ◽  
White Noise ◽  
Acoustic Reflex

Relationships between acoustic reflex patterns elicited by unfiltered white noise and narrow band white noise stimuli of different duration but of the same intensity

1985 ◽  
Vol 99 (9) ◽  
pp. 857-863 ◽  
Author(s):  
Giovanni Rossi ◽  
Paolo Solero ◽  
M. Rolando
Keyword(s):  
White Noise ◽  
Narrow Band ◽  
Acoustic Signals ◽  
The Other ◽  
Acoustic Reflex ◽  
Other Hand ◽  
Recruitment Time

AbstractFor the purpose of this study, acoustic signals were generated by an Amplaid MK VI. An Amplaid 702 impedence meter was connected to its averaging section and to its computer. The stimuli were bursts of unfiltered white noise (UWN) and of narrow band white noise (NBWN; 30 db./oct/slope; central frequencies 1,000, 2,000, 4,000 Hz.) lasting 3–1,000 msec, at intensity of 105 db. SPL p.e. The following parameters were evaluated: stapedius contraction latency, amplitude, duration and recruitment time. It was found that latency was independent of the spectrum of the stimulus and its duration. Amplitude and recruitment time, on the other hand, were related to spectrum and duration, while duration of contraction was directly related to the duration of the stimulus only.

Predicting Hearing Loss from the Acoustic Reflex

1974 ◽  
Vol 39 (1) ◽  
pp. 11-22 ◽  
Author(s):  
James Jerger ◽  
Phillip Burney ◽  
Larry Mauldin ◽  
Betsy Crump
Keyword(s):  
Hearing Loss ◽  
Young Children ◽  
White Noise ◽  
Sensorineural Hearing Loss ◽  
Sensorineural Hearing ◽  
Acoustic Reflex ◽  
Pure Tones

Acoustic reflex thresholds for pure tones and white noise were used to predict severity of audiometric loss in 1043 ears with sensorineural hearing loss. Both severity and slope of loss were predicted in an additional 113 ears. Prediction was usually quite accurate. Serious errors occurred in only 4% of cases. These findings have important implications for the auditory evaluation of babies and young children.

A Contribution to the Physiology of the Perilymph Part III: On the Origin of Noise-Induced Hearing Loss

1974 ◽  
Vol 83 (3) ◽  
pp. 406-412 ◽  
Author(s):  
Ernst-August Schnieder
Keyword(s):  
Blood Flow ◽  
Hearing Loss ◽  
Exchange Rate ◽  
White Noise ◽  
Oxygen Supply ◽  
Prolonged Exposure ◽  
Organ Of Corti ◽  
Sensory Cells ◽  
Cochlear Blood Flow ◽  
Critical Intensity

After exposure to white noise (SPL > 90 dB) the cochlear half life (τ) is increased by 100%. After exposure to white noise (90 dB<SPL<105 dB) the concentration of lactate in the perilymph increases significantly, while the blood level remains constant. Both results are capable of supporting the hypothesis that exposure to noise of a critical intensity (which appears to lie beween 90 and 100 dB) reduces cochlear blood flow. This reduction in turn diminishes the exchange rate of perilymph and reduces the oxygen supply to the sensory cells. The subsequent hypoxidosis of the organ of Corti may cause metabolic breakdown in, and on prolonged exposure, degeneration of the sensory cells. Both results are further capable of supporting the hypothesis outlined in Part I, that perilymph is the medium of transport to and from the cells of the organ of Corti.

Clinical Acoustic Reflex Threshold Measurements in Infants

1977 ◽  
Vol 42 (4) ◽  
pp. 514-519 ◽  
Author(s):  
Dennis A. Abahazi ◽  
Herbert J. Greenberg
Keyword(s):  
White Noise ◽  
Acoustic Impedance ◽  
Acoustic Reflex ◽  
Auditory Thresholds ◽  
Low Pass ◽  
Reflex Threshold ◽  
Pure Tones ◽  
One Year ◽  
Acoustic Reflex Threshold ◽  
High Pass

Acoustic reflex thresholds elicited using clinical acoustic impedance techniques were obtained on normal infants between one month and one year of age. Reflex activating signals of 500, 1000, 2000 Hz, low-pass, high-pass, and white noise were used. Less intensity was required to elicit the acoustic reflex to the noise than to the pure tones, with the 500-Hz tone requiring the greatest intensity. Inference of auditory thresholds from the acoustic reflex indicated the presence of normal hearing in the infant group.

`White-Noise' in Imperfect Markets: The Case of the Frac/Dollar Exchange Rate

1977 ◽  
Vol 32 (3) ◽  
pp. 761 ◽  
Author(s):  
Dennis E. Logue ◽  
Richard James Sweeney
Keyword(s):  
Exchange Rate ◽  
White Noise ◽  
Imperfect Markets ◽  
Dollar Exchange Rate
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