Let Your Fingers Do the Seeing Quick – name the five senses. Most people readily list sight, taste, hearing, and smell. And then pause before remembering: touch. Equal loudness contours and audiometry - Test your own hearing Repeat: do not start in the top third of the chart. How to use this web service to measure equal loudness curves. Minimise any background noise: turn off machinery, close windows etc. If your computer has a fan, you may be able to put it under the desk. Plug headphones into your soundcard output and put them on, making sure that they seal well around your ears.
Online Tone Generator - Hearing Test Results: Is your hearing better or worse than average? Results from the Online Hearing Test. Is your hearing better or worse than average? A random sample of 350 results posted in the hearing test comments has been used to compile an age vs frequency graph. It shows the highest frequency at which people of a certain age can hear up to. Hover over points on the graph to see the specific data used. How old memories fade away If you got beat up by a bully on your walk home from school every day, you would probably become very afraid of the spot where you usually met him. However, if the bully moved out of town, you would gradually cease to fear that area. Neuroscientists call this phenomenon “memory extinction”: Conditioned responses fade away as older memories are replaced with new experiences. A new study from MIT reveals a gene that is critical to the process of memory extinction.
dB: What is a decibel? Sound pressure, sound level and dB. Sound is usually measured with microphones and they respond (approximately) proportionally to the sound pressure, p. Now the power in a sound wave, all else equal, goes as the square of the pressure. Work-related musculoskeletal injuries in physiotherapists To avoid injury while lifting, it important to estimate the weight of the load and the lifting environment. The worker has to choose a safe working method and be able to to use tools and equipment to make the work lighter. Lifting Lift the object close to your body to avoid stretching of the muscles and ligaments of the back (decrease the lever arm)Contract your abdominal and back muscles during lifting so the back stays in the same positionStand close to the object and keep your feet apart to maintain balanceLift with both hands and grip the object with your entire hand (not just the fingers) Biomechanical analysis of forces acting on the lumbar spine while performing a lift in two different positions:
Pitch, loudness and timbre. From Physclips In this example, the signal is a sine wave. Its frequency is initially 440 Hz. It then increases over time to 880 Hz and maintains that frequency. Try It: Can You Hear These Sounds Only Young People Hear? How young are your ears? (Photo: Getty Images) Did you know that, as we age, we can no longer hear certain high-pitched noises as well as we did during our youth? The First Mind-Controlled Bionic Leg Steps Into Reality A team of scientists are getting closer to the holy grail of brain-powered prosthetics by developing the first advanced-movement prosthetic leg that communicates with the wearer’s mind. Zac Vawter, 31, lost his leg just above the knee in a 2009 motorcycle accident. But today he’s the “test pilot” for the first bionic leg that can complete tasks like going up stairs or down slopes, all controlled by Vawter’s mind. A study announcing the progress of the limb is published today in The New England Journal of Medicine. (MORE: A Bionic Breakthrough: A Hand that Lets Amputees ‘Feel’) The leg is the brainchild of a collaborative group of engineers, neuroscientists, surgeons, and prosthetists at the Rehabilitation Institute of Chicago, funded with a $8-million grant from the Army.
Scientists Identify Protein Linking Exercise to Brain Health Oct 12, 2013 09:04 AM EDT A protein that is increased by endurance exercise has been isolated and given to non-exercising mice, in which it turned on genes that promote brain health and encourage the growth of new nerves involved in learning and memory, report scientists from Dana-Farber Cancer Institute and Harvard Medical School. Like Us on Facebook The findings, reported in the journal Cell Metabolism, help explain the well-known capacity of endurance exercise to improve cognitive function, particularly in older people. If the protein can be made in a stable form and developed into a drug, it might lead to improved therapies for cognitive decline in older people and slow the toll of neurodegenerative diseases such Alzheimer's and Parkinson's, according to the investigators. "What is exciting is that a natural substance can be given in the bloodstream that can mimic some of the effects of endurance exercise on the brain," said Bruce Spiegelman, PhD, of Dana-Farber and HMS.
Tiny, wireless pacemaker due to be launched in Europe 15 October 2013Last updated at 08:37 ET The device does not require invasive surgery to be implanted A miniaturised, wireless pacemaker that can be inserted into the body without invasive surgery has been given approval for use in the European Union. Developed by US start-up Nanostim, the device is designed to be implanted intravenously directly in the heart. It is less than 10% of the size of a conventional pacemaker and uses a built-in battery. Experts said it was an "exciting development" but at a very early stage. Sleep 'cleans' the brain of toxins The brain uses sleep to wash away the waste toxins built up during a hard day's thinking, researchers have shown. The US team believe the "waste removal system" is one of the fundamental reasons for sleep. Their study, in the journal Science, showed brain cells shrink during sleep to open up the gaps between neurons and allow fluid to wash the brain clean.
Swaddling resurgence 'damaging hips', surgeon warns 28 October 2013Last updated at 22:08 ET By James Gallagher Health and science reporter, BBC News Parents are risking their babies' health because of a surge in the popularity of swaddling, according to an orthopaedic surgeon. The technique involves binding the arms and legs with blankets and is used to help calm a baby and prevent crying. But Prof Nicholas Clarke, of Southampton University Hospital, said swaddling was damaging developing hips. The Royal College of Midwives and other experts advised parents to avoid tightly swaddling a child.