Tim Kerby wrote:
>
> Its not the brain that is slow.  It is retinal persistence that causes
> images to merge.  I recently made a light listner converting light to
> sound.  The ear can hear 50Hz mains hum for example and much above.  I have
> a 50Hz monitor and it flickers if I do not directly view it.  Does the
> retina respond slower in the center?
>

Yes.  Center (fovea) is mostly cone cells, color vision, high acuity,
lower sensitivity, lower critical flicker fusion freq.
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Paul Mathews, consulting engineer
AEngineering Co.

email: optoeng@whidbey.com
non-contact sensing and optoelectronics specialists