(9 resources)

Physics Meets Physiology - How We Hear and How We Can Lose Our Hearing
Schacht, Jochen - University of Michigan
2010-10-09 10:34:20-04:00
Ann Arbor, MI - University of Michigan - 170 Dennison
Duration: 00:52:53

Hearing is our most sensitive sense and a basis for human communication. Our ears can pick up the quiet rustling of leaves, recognize the voices of our loved ones (and not so loved ones), and help us enjoy the spectrum of sounds from a bass drum to a violin. Yet, our ears are also highly vulnerable, and hearing losses of significant severity affect more than 28 million individuals in this country alone. Approximately one-half of such losses are thought to be of hereditary origin. The others are acquired during our life time as the result of a variety of causes, including exposure to work-place or recreational noise, treatment with certain drugs, various diseases and the aging process itself. This lecture introduces the delicate organization of our inner ears, explores the major sources of acquired hearing loss and outlines potential remedies.

Jochen Schacht, Ph.D., is Professor of Otolaryngology, Professor of Biochemistry and Director of the Kresge Hearing Research Institute at the University of Michigan.
Comets and Cappuccinos: How a Coffee Break Helped Change the Way We Understand the Solar System
Consolmagno, Guy - Vatican Observatory
2010-10-16 10:32:37-04:00
Ann Arbor, MI - University of Michigan - 170 Dennison
Duration: 01:01:32

Learn how a cappuccino at the Vatican fifteen years ago inspired a new, efficient way of measuring meteorite densities. Startlingly, comparing these measurements to the densities of asteroids and comets has completely shaken up our understanding of small bodies in the solar system. It's altered our way of understanding the formation of planets, our ideas of defending ourselves from killer asteroids, and our definition of dwarf planets like Pluto.

Br. Guy Consolmagno SJ, is Curator of the Vatican Meteorite Collection, Vatican Observatory, Vatican City State
Cochlear Implants - An Amazing Advancement
El-Kashlan, Hussam - University of Michigan
2010-10-23 10:33:15-04:00
Ann Arbor, MI - University of Michigan - 170 Dennison
Duration: 00:55:16

with Professor Teresa A. Zwolan

Cochlear implants are considered to be one of the most significant technological achievements in the twentieth century for the treatment of deafness. Prior to the introduction of these implants, treatment options for profoundly deaf individuals included visual communication (lipreading or sign language), tactile devices, or reliance on amplification systems that provided limited auditory information. Cochlear implants enable most users to detect and recognize speech sounds across the entire speech spectrum even at very soft levels – a great improvement when compared to the limited information deaf patients receive with traditional hearing aids. This increased ability to understand speech has resulted in striking improvements in spoken language skills, academic and vocational achievements, and quality of life for profoundly deaf individuals. This lecture discusses this amazing technology, including a description of the internal and external components of contemporary devices, outline the surgical procedures to place the electrode array in the inner ear, and present the outcomes obtained with current cochlear implant recipients.

Dr. Hussam El-Kashlan is Professor of Otorhinolaryngology and Teresa A. Zwolan, Ph.D., is Professor of Otolaryngology and Director of the Cochlear Implant Program at the University of Michigan
Maintenance and Repair of Damaged Ears - Challenges for the Biologist and Bioengineer
Raphael, Yehoash - University of Michigan
2010-10-30 10:33:10-04:00
Ann Arbor, MI - University of Michigan - 170 Dennison
Duration: 01:01:55

Mammalian ears evolved to provide exquisite sensitivity for detection and discrimination of sounds. Along the evolutionary path, self-repair ability diminished, such that most injuries become irreparable and lead to permanent hearing loss. Innovative therapies are being developed to restore the inner ear and provide hearing ability to deaf patients. Among the biological options for future therapies are the implantation of stem cells or the induced transformation of non-sensory cells to new sensory (hair) cells. Therapies for nerve regeneration are also being developed to enhance performance with the cochlear implant and to innervate stem cells. Bio-engineering approaches that combine such biological therapies with artificial sources of acoustic stimulation are another area of intense development.

Yehoash Raphael, Ph.D., is the R. Jamison and Betty Williams Professor of Otolaryngology at the University of Michigan
Those Phantom Sounds (Ringing in Your Ears) are Produced by Your Brain - The Neuroscience of Tinnitus
Shore, Susan E - University of Michigan
2010-11-06 10:34:43-04:00
Ann Arbor, MI - University of Michigan - 170 Dennison
Duration: 00:48:53

Tinnitus is a phantom sound (ringing of the ears) that affects quality of life for millions of people around the world and is usually, but not always, associated with hearing impairment. In some cases, insults to the somatosensory system, such as tooth absences or disturbances of the temporo-mandibular joint can also result in tinnitus. Connections between these two sensory systems can explain why tinnitus can be modulated in loudness and pitch by somatic maneuvers such as jaw-clenching and eye movements. Evidence is provided that deafferentation of central auditory structures leads to increased neuron spontaneous firing rates and neural synchrony in the hearing loss regions that signal the phantom sounds. Crossmodal compensations in subcortical structures may contribute to central re-organization of auditory structures by providing aberrant, excitatory connections that result in hyperactivity.

Susan E. Shore, Ph.D., is Research Professor of Otolaryngology and Associate Professor of Molecular and Integrative Physiology, University of Michigan
Meeting the World's Energy Needs with the Fusion Hybrid Reactor
Kammash, Terry - University of Michigan
2010-11-13 10:35:52-04:00
Ann Arbor, MI - University of Michigan - 170 Dennison
Duration: 01:03:24

The World's energy needs by the mid century, when its population is expected to reach 10 billion, is projected to be 10-30 Terrawatts of carbon-free power. The fusion hybrid reactor is uniquely suited to meet these needs since it is self-fueling, can produce abundant power safely, and do this securely for decades.

Terry Kammash is the Stephen S. Attwood Professor Emeritus of Nuclear Engineering And Radiological Sciences
Particle Accelerators or Atom Smashers - the Engines of Discovery
Jones, Lawrence - University of Michigan
2010-12-04 10:20:00-05:00
Ann Arbor, MI - University of Michigan - 170 Dennison
Duration: 01:15:31

Research enabled by particle accelerators has lead to our discoveries and current understanding of nuclei and elementary particles. This talk reviews and explains the operation of these accelerators from the cyclotrons (of the 1930s) to the current colliding beams research facilities, such as the CERN Large Hadron Collider.

Lawrence Jones is Professor Emeritus of Physics at the University of Michigan
An Experiment to Explore the Mysteries of Space: The Alpha Magnetic Spectrometer on the International Space Station
Ting, Samuel - MIT
2010-12-11 10:36:00-04:00
Ann Arbor, MI - University of Michigan - 1800 Chemistry
Duration: 01:01:00

Samuel C. C. Ting is Professor Emeritus of Physics and a Nobel Laureate

Introduction by Professor Lawrence Jones, U-M Physics Department
We Own Frictionless Surfaces: The Physics of Hockey
Orr, Brad - University of Michigan
2010-12-11 13:38:00-05:00
Ann Arbor, MI - University of Michigan - 170 Dennison
Duration: 01:01:00

As an adjunct to the biggest show on ice, learn about the physics of shooting, skating, and checking. Chair of the Physics Department Brad Orr and lecturer David Winn--both recreational hockey players themselves--present a dynamic public lecture about the world’s fastest sport, complete with many visual experiments!