Search results for " sound"

Física por un tubo. Mide la velocidad del sonido en el aire y diviértete con los tubos sonoros

2011

En este trabajo damos las claves para diseñar un conjunto de tubos sonoros de PVC que permiten realizar una ejecución musical en grupo con la participación de un gran número de personas sin cultura musical previa. Proponemos además la utilización de los tubos para el estudio cuantitativo de los fenómenos físicos involucrados en la generación del sonido con instrumentos de viento. Se describe la utilización de los tubos sonoros, en combinación con un ordenador y un programa de análisis de sonido, para el análisis de ondas estacionarias y la determinación de la velocidad de propagación del sonido en el aire mediante distintos procedimientos.

Perceived differences between natural and convolution reverberation types in 5.0 surround sound

2011

This Graduate Thesis investigates the perceived differences between natural and convolution reverberation in surround sound. Two spaces with distinct reverberation times were used for this study. Initially three musical excerpts from three instruments (Cello, Oboe, and Piano) were recorded in a dry studio environment. Then the Impulse Response (IR) of the spaces was captured using two methods: balloon burst and sine sweep. The dry excerpts were then recorded in the spaces to capture the natural reverberation pattern while the IRs were convolved with them to create the artificial reverberation excerpts. A listening test was then conducted using six perceptual scales to rate these 18 excerpts…

Neural generators of the frequency-following response elicited to stimuli of low and high frequency: A magnetoencephalographic (MEG) study.

2021

The frequency-following response (FFR) to periodic complex sounds has gained recent interest in auditory cognitive neuroscience as it captures with great fidelity the tracking accuracy of the periodic sound features in the ascending auditory system. Seminal studies suggested the FFR as a correlate of subcortical sound encoding, yet recent studies aiming to locate its sources challenged this assumption, demonstrating that FFR receives some contribution from the auditory cortex. Based on frequency-specific phase-locking capabilities along the auditory hierarchy, we hypothesized that FFRs to higher frequencies would receive less cortical contribution than those to lower frequencies, hence supp…

Más allá de los genes; más allá de la piel. Sobre la razonabilidad argumentativa del constructivismo biológico y sus posibles implicaciones ético-jur…

2021

Trabajo de Fin de Máster en Investigación en Lógica y Filosofía de la Ciencia, curso 2020-2021

Association between low-frequency ultrasound and hip fractures - comparison with DXA-based BMD

2013

Background New methods for diagnosing osteoporosis and evaluating fracture risk are being developed. We aim to study the association between low-frequency (LF) axial transmission ultrasound and hip fracture risk in a population-based sample of older women. Methods The study population consisted of 490 community-dwelling women (78–82 years). Ultrasound velocity (VLF) at mid-tibia was measured in 2006 using a low-frequency scanning axial transmission device. Bone mineral density (BMD) at proximal femur measured using dual-energy x-ray absorptiometry (DXA) was used as the reference method. The fracture history of the participants was collected from December 1997 until the end of 2010. Lifestyl…

Should Reinke edema be considered a contributing factor to post-extubation failure?

2015

We read with interest the recently published review in Critical Care about post-extubation laryngeal edema and stridor by Pluijms et al. [1]. The review considers in detail the risk factors for post-extubation respiratory failure and describes a post-extubation algorithm for its prevention and reduction. We recently published a case report describing the occurrence of post-extubation stridor leading to post-extubation respiratory failure in a woman with a previously undiagnosed Reinke edema (RE) [2]. RE is a progressive laryngeal soft-tissue swelling. The condition typically manifests in female gender as hoarseness and as a gradually deepening voice in patients with a history of smoking, vo…

Refractory Death Rattle: Deep Aspiration Facilitates the Effects of Antisecretory Agents

2011

Anticholinergic drugs, including atropine, hyoscine butylbromide, and scopolamine, have been shown to be equally effective in the treatment of death rattle. However, anticholinergic drugs may only be effective in reducing the production of further secretions, rather than eliminating the existing ones. A case is described in which a preventive procedure was undertaken to carefully eliminate secretions before starting anticholinergic drugs. Airway aspiration under light anesthesia removed secretions before starting anticholinergic drugs. Low doses of propofol were given intravenously to make a laryngoscopy feasible, allowing the complete aspiration of large amounts of tracheal secretions. No …

O069. Menstrual cycle affects cortical excitability differently in females with migraine and in healthy controls: a new perspective by cross modal so…

2015

The sound-induced flash illusions (SIFI) represent a valid tool to explore multimodal perception and are critically dependent on visual and acoustic cortical excitability [1, 2]. In a previous study [3], we observed a significant reduction of illusions in migraine patients with respect to healthy controls, probably due to a condition of visual cortex hyperexcitability. Aim of the present study was to evaluate SIFI perceptions in healthy women and patients with menstrual migraine and to describe the effects of cyclical change of steroid hormones and cortical responsiveness.

Separating mismatch negativity (MMN) from obligatory brain responses for speech and non-speech sounds in school-aged children

2010

Auditory Training in Deaf Children

2010

Deaf children are, earlier than in the past, identified and can benefit of new and highperformance devices (as cochlear implants or digital hearing aids). However, a great variability in their spoken language skills is observed (12) and first attributable to the well-known effect of the age of auditory rehabilitation (15, 16, 17, 18, 19, 20, 21, 22). The second assessment concerns the way speech disorders are treated: new technologies are not linked to any change in the way speech therapy is delivered, particularly in the field of auditory training. Auditory training constitutes an important part of the speech therapy addressed to the deaf children and must start as soon as possible. The go…