2 edition of effects of intense noise and masking on pure-tone detection in Rhesus monkeys (Macaca mulatta) found in the catalog.
effects of intense noise and masking on pure-tone detection in Rhesus monkeys (Macaca mulatta)
Randy Lloyd Tubbs
Written in English
|Statement||by Randy Lloyd Tubbs|
|The Physical Object|
|Pagination||117 leaves :|
|Number of Pages||117|
The absolute threshold of hearing is the minimum sound level of a pure tone that an average ear with normal hearing can hear with no other sound present. The absolute threshold relates to the sound that can just be heard by the organism. The threshold of hearing is generally reported as the RMS sound pressure of 20 μPa (micropascals) = 2×10 −5 pascal (Pa). booth. Behavioral pure-tone testing was con-ducted with a Virtual audiometer. In the frequency range below 8 kHz, TDHP ear-phones in MX/AR cushions were used. Koss Pro/4X Plus earphones, modified as described in Fausti et al (), were used for frequencies at and above 8 kHz. Tympanometry and con-tralateral acoustic reflexes were.
BACK TO BACK to NOISE page. Developing a new Healdsburg Noise Ordinance. Noise Glossary. Noise Glossary "A Weighting" = [Expressed as dB(A)] You can measure the sound pressure level with various "weighting filters" whose characteristics approximate the sensitivity of the ear at various frequencies and levels based on the Fletcher . In animal models, this synaptopathy is associated with a reduction in the amplitude of wave I of the auditory brainstem response (ABR). The goal of this study was to determine whether higher lifetime noise exposure histories in young people with clinically normal pure-tone thresholds are associated with lower ABR wave I by:
The reflex is triggered by loud sounds; it also reduces the extent of upward spread of masking from intense low-frequency sounds (see hearing lecture 3). Damage to the middle ear causes a Conductive Hearing Loss which can usually be corrected by a hearing aid. In a conductive hearing loss, absolute thresholds are elevated. Full text of "DTIC ADA Symposium: Noise-Induced Hearing Loss Held in Beaune, France on May " See other formats.
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Masking Rules If the difference between the AC threshold of TE and AC or BC threshold of NTE is 40 dB or greater (or 60 dB or greater for insert phones), you need to mask for AIR conduction.
If the air-bone gap is greater than 10dB in the TE, you need to mask for Bone conduction. For normal hearing monkeys, tone detection thresholds were lower in SAM noise than in SN, probably due to the subject's ability to hear the tone in SAM noise at times when the SNR is more favorable (Dylla et al., ).
Fig. 7 shows the effects of noise exposure on this masking by: 3. A fundamental function of the auditory system is to detect important sounds in the presence of other competing environmental sounds. This paper describes behavioral performance in a tone detection task by nonhuman primates (Macaca mulatta) and the modification of the performance by continuous background noise and by sinusoidally amplitude modulating signals or by: A fundamental function of the auditory system is to detect important sounds in the presence of other competing environmental sounds.
This paper describes behavioral performance in a tone detection task by nonhuman primates (Macaca mulatta) and the modification of the performance by continuous background noise and by sinusoidally amplitude modulating Cited by: Noise health effects are the physical and psychological health consequences of regular exposure to consistent elevated sound ed workplace or environmental noise can cause hearing impairment, tinnitus, hypertension, ischemic heart disease, annoyance, and sleep disturbance.
Changes in the immune system and birth defects have been also attributed to noise exposure. A previous study of the detection of signals in noise found that when tones or noise were amplitude-modulated, the noise was a less effective masker, and.
Am J Otolaryn8ol ", Temporary Hearing Loss from Exposure to Moderately Intense Tones in Rhesus Monkeys BRENDA L.
LONSBURY-MARTIN, PH.D.* AND GLEN K. MARTIN, PH.D.* The amount and duration of temporary threshold shift produced by exposure to moder- ately loud sounds were quantitatively examined in rhesus monkeys using a simple, be Cited by: 6.
Four patas monkeys were trained using operant reinforcement techniques to perform forward masking PTCs at frequencies of Hz, 2, 4, and 8 kHz, at 10 dB SL.
Steady and pulsed-tone thresholds were also measured from 63 Hz to 40 kHz in half-octave by: Weindruch, Richard()'Tympanometry in rhesus monkeys: Effects of aging and caloric restriction',International Journal of Audiology, — To.
For pure tone air conduction testing mask when there is a difference of 40 dB or greater between the bone conduction threshold in the better ear and the air conduction threshold in the poorer ear During pure tone bone conduction testing, mask when there is a difference of 10 dB or greater between the BC threshold of the better ear and the AC.
In adult listeners, the signal-to-noise ratio at masked threshold remains constant with increases in masker level over a wide range of stimulus conditions. This relationship was examined in 7-month-old infants by obtaining masked thresholds for and 4-kHz tones presented in four levels of continuous masking by: 9.
comparison of tone burst auditory brainstem response (ABR) latencies elicited with and without notched noise masking Objective: The air conduction click is currently the most widespread stimulus used to estimate the pure tone audiogram as part of auditory brainstem response (ABR) testing.
The click is. reproducible-noise detection task in this study is analogous to more traditional tone-in-noise masking experiments in which the noise is created randomly and without replacement on each trial e.g., Dolan, When the number of repro-ducible masker waveforms exce subjects do not “learn” individual masker waveforms Pfafﬂin, Noise-induced hearing loss - Acoustic trauma - Monkeys - TTS - PTS - Octave-band noise.
Studies of noise-related hearing loss have been characterized by two distinct ap- proaches: epidemiological surveys of workers in noisy factories, and laboratory studies on man and animals. alert rhesus monkey was explored for neuronal responses to pure and harmonic complex tones and noise.
The monkeys had been previously trained to recognize the similarity between harmonic complex tones with and without fundamentals. Because this sug- gested that they could perceive the pitch of the lacking funda. Third, reliable and sensitive diagnostic metrics are needed to identify synaptopathy and other types of peripheral and central pathology associated with noise exposure.
The pure tone audiogram and other classic audiologic assessment tools are generally insensitive to the presence of synaptopathy in : Jane A. Burton, Michelle D. Valero, Troy A. Hackett, Ramnarayan Ramachandran. dihydrostreptomycin-sulfate (DHSM) to investigate the effects of selective outer hair cell (OHC) lesions on psychophysical tuning curves (PTC).
Four patas monkeys were trained using operant reinforcement techniques to perform forward masking PTCs at frequencies of Hz, 2, 4, and 8 kHz, at 10 dB SL. White noise and narrow band noise were used as a masker when pure tone was the test stimulus, and pure tones were used as masking stimulus when testing with white noise.
Young, I. Effects of pure-tone masking on low-pass- and high-pass- filtered noise. Journal of the Acoustical Society of America,45(5), TABLE OF CONTENTS Session 1 Introduction and Masking Effects of Noise Chairman: Henning von Gierke (USA) Page A Preview of the Congress Content, W. Dixon Ward (USA) 3 Systems of Noise Measurement, Karl S.
Pearsons (USA) 7 The Effects of Noise on the Hearing of Speech, John C. Webster (USA) 25 Reception of Distorted Speech, Jerry V. Tobias, F. McFadden’s early research was on the basic processes of human hearing – how one sound can mask another, how humans localize sounds in three-dimensional space, the effects of intense sounds and drugs on the auditory system, and so on – but later he developed an interest in certain sex differences and hormonal effects on the auditory Occupation: Professor Emeritus.
47 tiple pure tone noise generation and propagation since the s. Towards 48 predicting MPT noise, Morfey and Fisher  calculated the non-dimensional 49 \time of ight" of a wave spiraling around a duct in terms of the axial dis tance upstream of the fan, as well as the nonlinear attenuation of a regular 51 sawtooth waveform.
McAlpine and Fisher  proposed both time .Effects of Stimulus Phase on the Latency of the Auditory Brainstem Response Michael P. Gorga Jan R. Kaminski Kathryn L. Beauchaine Abstract Auditory brainstem responses were measured in five normal-hearing subjects, using single-cycle sinusoids at octave frequencies ranging from to Hz.
These sinusoids, gated.Rhesus monkeys to examine the long term effects of everyday an_ industrial i noise on blood pressure.
Results from the first set of animals indicate that? daily exposure to such noise produced sustained elevations in blood pressure. Due to the complexity of this type of study_ mere work is clearly needed toFile Size: 15MB.