I'd recommend Intelligence by Jeff Hawkins for some thought-provoking insights 
into high-level perceptual processing in the brain.

Richard

> On 8 May 2014, at 06:59, Enr G <e.glerean....@gmail.com> wrote:
> 
> My two cents as a person in the field:
> 
> the human hearing system is kind of an LTI... only at very low level
> processing. The consistency of measured signal (= perceiving the same
> signal the same way at all time as somebody wrote here) is present in
> the ear canal up to brainstem -> inferior colliculus. But once we go
> to higher neuronal processing of auditory signals things get
> complicated and the same signal can be perceived in many different
> ways (e.g. google for top-down mechanism of auditory attention). The
> (non linear) fourier analysis and interpreting sounds as sinusoid are
> valid at ear canal level, and there are models with filterbanks to
> simulate that. But once we go to conscious perception (=cerebral
> cortex) evidence from animal research seems to point to a more complex
> analysis performed by the neurons: the so called spectro-temporal
> modulation (basically a 2D fourier transform). I.e. envelopes and
> phases are treated in different ways to identify "sound objects". For
> those interested, this is a nice starting point (open access):
> http://www.ploscompbiol.org/article/info%3Adoi%2F10.1371%2Fjournal.pcbi.1003412#pcbi-1003412-g007
> 
> e.
> 
>> On Thu, May 8, 2014 at 8:28 AM, eric <ericzh...@gmail.com> wrote:
>> It would appear to me that the human hearing system is an LTI system.  It 
>> doesn't react in a linear fashion to frequency or loudness, but it perceives 
>> the same signal the same way at all times, disregarding aging, hearing loss, 
>> etc.
>> 
>> On 5/8/2014 1:25:28 AM, Sampo Syreeni <de...@iki.fi>wrote:
>> On 2014-05-08, robert bristow-johnson wrote:
>> 
>>> there was a way that you could do "subtractive dither" in that the
>>> dither that you added before quantizing to a short word could be
>>> subtracted (to regain 4.77 dB) [...]
>> 
>> I have some code for just that, even, and even better ideas. Maybe I
>> even mentioned them somewhere a while back? If not, will fully share
>> given interest. (The code is rather shitty, and even the ideas would
>> benefit from development. But still better than you see implemented
>> anywhere.)
>> 
>> Yet why-oh-why doesn't anybody just pop up their Audacity and a few
>> megabytes of randomness, the way I originally asked? Because the stuff
>> I'm talking about really is kind of interesting and unexpected, once you
>> try it out on your own ears...
>> 
>>> when you loop the noise, is it a "butt-splice"? (i.e. no crossfade.)
>> 
>> Yes. Otherwise the splice might introduce an interpolation artifact
>> which would invalidate the experiment from the start.
>> 
>>> it's news to me that human hearing is LTI.
>> 
>> Yes, well, it ain't. But even conventional psychophysical theory treats
>> it as such. For example, why would we hear frequencies unless the ear
>> was LTI? Fourier analysis, that is sinusoids as something special,
>> doesn't make much sense unless you assume... Well, you know, at least
>> something having to do with linearity and shift-variance... ;)
>> --
>> Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
>> +358-40-3255353, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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