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27

Hearing declines with age and, typically, high frequencies are affected first. Age-related hearing loss (or presbyacusis (Kujawa & Liberman, 2006)) is progressive and starts at the highest frequencies and as a person ages the lower frequencies are affected. The reduction in hearing sensitivity is caused by the loss of hair cells. Hair cells are sensory ...


8

Short answer The exact mechanism behind tinnitus (ringing in the ear) is unknown. Background Of the two theories you pose here, to the best of my knowledge the second one is the most widely accepted. It is a generally accepted phenomenon that whenever neural systems are being deprived of input, they start seeking new input, or even generate it ...


4

The main problem is that Mad Cow disease is not caused by a "normal" pathogen but by a prion, a protein. Traditionally, disease causing agents can be classified into viruses, bacteria, fungi, and parasites. Bacteria, fungi and parasites are all living organisms, alive in the traditional sense. It is, therefore, possible to design drugs that kill them. ...


3

I have only ever heard of one case where RP caused blindness in a newborn. Unfortunately, I am unable to release the name or any details of the patient because of privacy issues and so forth. Usually blindness from RP comes after a few years of life (as you said), making blindness from birth (or even early infancy) very rare. I can tell you, however, ...


2

Of course. As you quoted from Wikipedia: It is commonly associated with tiredness, stress, overwork, lack of stimulation and boredom. Insomniacs, because they can't get a good sleep, are more tired and stressed than the others.


2

Fragile X syndrome is a genetic disorder which is highly related to autism and is considered to be the most common single gene association with autism. Establishing what actually happens in autistic people is difficult because it is hard to quantify someone as being autistic or not - it is common for some people to show some signs of autistic type behaviour ...


2

There is quite a bit of data available from Venezuelan HD families, but they haven't identified the factors themselves. From the abstract of the paper, emphasis mine: Analysis of the 83 kindreds that comprise the Venezuelan HD kindreds demonstrates that residual variability in age of onset has both genetic and environmental components. We created a ...


1

A big challenge is obstacles presented by the blood-brain barrier.



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