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Apr
6
comment Why is Fast Fourier Transform applied to raw EEG data?
@smeeb - (2) Sorry, I can't help there as far as the biology goes. FFTs are used in a lot of applications where the particular frequencies are important, including mass spectrometry where the specific frequencies allow gas components to be identified; machine analysis where the individual frequencies can be used to identify defects in couplings or bearings; and audio processing where it can be used to remove noise, or analyze the harmonics of a violin. Often, there is a great deal of information within the frequency spectrum
Apr
6
comment Why is Fast Fourier Transform applied to raw EEG data?
@smeeb - (1) The FFT creates a single graph of amplitude vs frequency. To actually generate the original time series from the FFT result, you would have to create a sin wave of the right amplitude for each frequency in the answer, and then add them all together. But the FFT result is just a single graph.
Apr
6
answered Why is Fast Fourier Transform applied to raw EEG data?
Mar
31
awarded  Informed
Sep
28
comment What is the point of a runny nose during a cold?
Is this known through some sort of study, or conjecture? I ask because I've heard it said that some symptoms, such as sneezing, are not the body's way of fighting a virus, but instead an effect that the virus has evolved to induce in the body to aid in spreading itself more readily. A runny nose could be similar. I have no idea, but am curious whether anyone really knows the answer.
Jan
13
comment Why can't we call dog breeds different species?
Interesting island experiment, but with intermediate sizes they may eventually all interbreed to produce a single population of mutts. What about introducing only two breeds of dogs - one very large and one very small. If the island has sufficient resources that both can survive, would they effectively develop into different species? Might they evolve in ways that pushed them further apart?
Oct
1
comment Is evolution true as Darwin said?
@mgkrebbs - Great comment about ring species. Here's a nice explanation: pbs.org/wgbh/evolution/library/05/2/l_052_05.html
Sep
17
comment Changing the definition of life?
Drawing a clear line is difficult as you note. But science typically excludes viruses because they don't have the proteins and other parts necessary to reproduce or survive on their own. They contain the genetic code necessary to hijack the functional parts of cells in other organisms, but nothing else. Viruses don't follow chemical directions - they rely on the host cell to do that.
Jul
10
answered Is Hydrogen gas present in biogas, and does it spontaneously ignite?
Jun
9
awarded  Supporter
Oct
7
awarded  Teacher
Oct
7
answered What gaseous substances do humans emit?
Jul
21
awarded  Editor
Jul
21
revised If body temperature is 37°C (98.6°F), why are most people more comfortable at around 21°C (70°F)?
Added link to article on human muscle efficiency
Jul
21
suggested approved edit on If body temperature is 37°C (98.6°F), why are most people more comfortable at around 21°C (70°F)?