Search results for "Audi"

The brainstem efferent acoustic chiasm in pigmented and albino rats

2015

Abstract The present study examined whether structural peculiarities in the brain-efferent pathway to the organ of Corti may underlie functional differences in hearing between pigmented and albino individuals of the same mammalian species. Pigmented Brown-Norway rats and albino Wistar rats received unilateral injections of an aqueous solution of the retrograde neuronal tracer Fluorogold (FG) into the scala tympani of the cochlea to identify olivocochlear neurons (OCN) in the brainstem superior olivary complex. After five days, brains were perfusion-fixed and brainstem sections were cut and analyzed with respect to retrogradely labeled neurons. Intrinsic neurons of the lateral system were lo…

Both attention and prediction are necessary for adaptive neuronal tuning in sensory processing

2014

International audience; The brain as a proactive system processes sensory information under the top-down influence of attention and prediction. However, the relation between attention and prediction remains undetermined given the conflation of these two mechanisms in the literature. To evaluate whether attention and prediction are dependent of each other, and if so, how these two top-down mechanisms may interact in sensory processing, we orthogonally manipulated attention and prediction in a target detection task. Participants were instructed to pay attention to one of two interleaved stimulus streams of predictable/unpredictable tone frequency. We found that attention and prediction intera…

Narraciones escritas en niños con Trastorno Específico del Lenguaje (TEL)

2012

El presente estudio examinó las narraciones escritas, así como la influencia de las variables lingüísticas sobre la competencia narrativa de los niños con Trastorno Específico del Lenguaje (TEL). Veinticinco niños con TEL y 25 niños con desarrollo normal del lenguaje, equilibrados en edad e inteligencia, realizaron una tarea de narración escrita. Los resultados indican que ambos grupos difieren en la producción de narraciones. Los niños con TEL no solo escribieron historias más cortas, sino también de menor organización y coherencia. Además cometieron significativamente más errores de ortografía natural y de sintaxis. Los análisis de regresión jerárquica mostraron que diferentes medidas lin…

Reading Disabilities in children with Specific Language Impairment

2019

El presente estudio examinó el rendimiento en lectura de los niños con Trastorno Específico del Lenguaje (TEL). Treinta niños con TEL y 32 niños con desarrollo normal del lenguaje, equilibrados en género, edad cronológica e inteligencia, fueron evaluados mediante el PROLEC-R. Los resultados de los ANOVAs indicaron que ambos grupos difieren en el rendimiento en lectura. Como grupo, los niños con TEL tuvieron significativamente un rendimiento inferior, tanto en la exactitud como en el tiempo de la lectura de palabras y pseudopalabras, por lo que tenían una menos eficacia de lectura. En la misma línea, el rendimiento de los niños con TEL en comprensión literal e inferencial también fue inferio…

Auditory distance perception in an acoustic pipe

2008

In a study of auditory distance perception, we investigated the effects of exaggeration the acoustic cue of reverberation where the intensity of sound did not vary noticeably. The set of stimuli was obtained by moving a sound source inside a 10.2-m long pipe having a 0.3-m diameter. Twelve subjects were asked to listen to a speech sound while keeping their head inside the pipe and then to estimate the egocentric distance from the sound source using a magnitude production procedure. The procedure was repeated eighteen times using six different positions of the sound source. Results show that the point at which perceived distance equals physical distance is located approximately 3.5 m away fr…

Music and Action

2013

Music performance includes planning, initiation, execution, monitoring, and correction of actions. This makes music performance a valuable tool for the study of human action and its neural correlates. This chapter reports action-related processes evoked by the perception of actions, and processes of error correction during music performance. Neuroscientific studies showed that, during the perception of action, neural systems are active that are also active during the performance of such actions. This supports the "common coding principle" stating that the late stages of perception and the early stages of action share a common representational format (such as the same neural code). Studies o…

Hyperbilirubinemia, Auditory Neuropathy and Prelingually Deafness: Evidence Linking

2013

Distinct neural responses to chord violations: a multiple source analysis study.

2011

The human brain is constantly predicting the auditory environment by representing sequential similarities and extracting temporal regularities. It has been proposed that simple auditory regularities are extracted at lower stations of the auditory cortex and more complex ones at other brain regions, such as the prefrontal cortex. Deviations from auditory regularities elicit a family of early negative electric potentials distributed over the frontal regions of the scalp. In this study, we wished to disentangle the brain processes associated with sequential vs. hierarchical auditory regularities in a musical context by studying the event-related potentials (ERPs), the behavioral responses to v…

The impact of a concurrent motor task on auditory and visual temporal discrimination tasks

2016

Previous studies have shown the presence of an interference effect on temporal perception when participants are required to simultaneously execute a nontemporal task. Such interference likely has an attentional source. In the present work, a temporal discrimination task was performed alone or together with a self-paced finger-tapping task used as concurrent, nontemporal task. Temporal durations were presented in either the visual or the auditory modality, and two standard durations (500 and 1, 500 ms) were used. For each experimental condition, the participant’s threshold was estimated and analyzed. The mean Weber fraction was higher in the visual than in the auditory modality, but only for…

The "ticktock" of our internal clock: direct brain evidence of subjective accents in isochronous sequences.

2003

The phenomenon commonly known as subjective accenting refers to the fact that identical sound events within purely isochronous sequences are perceived as unequal. Although subjective accenting has been extensively explored using behavioral methods, no physiological evidence has ever been provided for it. In the present study, we tested the notion that these perceived irregularities are related to the dynamic deployment of attention. We disrupted listeners' expectancies in different positions of auditory equitone sequences and measured their responses through brain event-related potentials (ERPs). Significant differences in a late parietal (P3-like) ERP component were found between the resp…