<div dir="auto"><div><br><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Thu, Sep 4, 2025, 8:29 AM Adrian Tymes via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Thu, Sep 4, 2025 at 12:59 AM Keith Henson via extropy-chat<br>
<<a href="mailto:extropy-chat@lists.extropy.org" target="_blank" rel="noreferrer">extropy-chat@lists.extropy.org</a>> wrote:<br>
> If it is possible to upload a brain, the same tools should allow the<br>
> reverse.<br>
<br>
Not necessarily. It is quite possible to be able to read a state from<br>
neurons - measuring the electrical and chemical state - without being<br>
able to recreate that state.<br></blockquote></div></div><div dir="auto"><br></div><div dir="auto">While true that it may be technically impossible (for a given technology level) it's shouldn't be logically or physically impossible to do so, given what is currently known about physics.</div><div dir="auto"><br></div><div dir="auto">For example, the universal application of physical laws implies that if a physical arrangement can be occur once, it is possible for it to occur again.</div><div dir="auto"><br></div><div dir="auto">According to current cosmological theories, your exact state as you exist on earth has occurred not only once, but has occurred an infinite number of times across an infinite cosmos. It is even possible to (roughly) calculate how near your closest such doppelganger should be.</div><div dir="auto"><br></div><div dir="auto">This paper estimates 10^10^29 meters:</div><div dir="auto"><a href="https://space.mit.edu/home/tegmark/multiverse.pdf">https://space.mit.edu/home/tegmark/multiverse.pdf</a></div><div dir="auto"><br></div><div dir="auto">So while we lack the ability to read, or write biological neurons today, this limitation should be overcome with a sufficient technology level.</div><div dir="auto"><br></div><div dir="auto">Jason </div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote gmail_quote_container"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
It's like the difference between the skill of literacy, and having the<br>
knowledge and ability to manufacture pens or pencils - or knowing that<br>
the letters are created by depositing pigment on surfaces. (For<br>
instance and slightly analogous, one may have learned to read from<br>
pictures. While one might know how pictures are taken, not having<br>
personally inspected the things that pictures are taken from, one has<br>
not had a way to reverse engineer the process of creating letters.)<br>
<br>
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