la empresa y su clasificacion

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C

Universidad Fermín Toro
Ciencia Económicas Y Sociales
Escuela De Relaciones
Industriales
Cabudare -Lara

La empresa y su
clasificación
Mapa conceptual

Noralys cordero
CI. 19.433.650

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Destacado

The ability to understand speech in background noise may be partially facilitated by the medial olivocochlear reflex (MOCR), in normal-hearing individuals. The MOCR is elicited by moderate-to-high level sounds and reaches its full strength after ~100 ms, following the onset of an acoustic elicitor. The main effect of the MOCR is to reduce outer hair cell (OHC) gain in response to sound. A reduction in OHC gain may lead to a better signal-to-noise ratio (SNR) at the output of the cochlea. This change in gain may also increase the contrast between high-intensity peaks and low-intensity dips in a speech envelope. This hypothesis is tested by inserting a decrement in an otherwise steady-state signal to simulate the abrupt intensity dips occurring in speech, such as gaps between words and sentences, and voice-onset time. Decrement thresholds were obtained at the onset and the temporal center of a narrowband, low-fluctuating noise pedestal centered on 2-kHz and 4-kHz. With the sluggish start of the MOCR, detection of the decrement at the pedestal onset is assumed to occur while the MOCR is in its latent state. Detection of the decrement at the temporal center of the pedestal is assumed to occur ARO Abstracts 62 Volume 38, 2015 when the MOCR is fully active. Preliminary results indicate that decrement thresholds are lower when the decrement is located at the temporal center of the pedestal compared to a decrement near the onset. This finding is consistent with the hypothesis that eliciting the MOCR improves the post-cochlear contrast between steady-state and decrement portions of the pedestal. Alternative hypotheses, such as neural adaptation and perceptual confusion, may also account for these findings. As part of a larger project, mechanisms behind decrement detection are being evaluated using a computational model of the auditory system.

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la empresa y su clasificacion

1. Universidad Fermín Toro Ciencia Económicas Y Sociales Escuela De Relaciones Industriales Cabudare -Lara La empresa y su clasificación Mapa conceptual Noralys cordero CI. 19.433.650