From: Anders Sandberg (asa@nada.kth.se)
Date: Fri Jan 29 1999 - 08:38:42 MST
This week: neural interfaces, a new anti-aging treatment, a pinch of
terraforming, Herakleitean pre-geometry, quantum smart matter, the
smallness of the web, finding communities from mail and reading the
classics. No, I don't have time to sleep.
Neural interfaces for regenerated nerve stimulation and
recording
Printed spiral coils for neuroprosthetic transcranial
telemetry applications
Gene therapy to block aging-related loss of muscle function
Terraforming Mars: A review of Research
Self-Referential Noise and the Synthesis of Three-Dimensional Space
Quantum Smart Matter
Testing the Small World Hypothesis on the Web
Beehive: A System for Cooperative Filtering and Sharing of
Information
Other reading
Neural interfaces for regenerated nerve stimulation and recording
P. Dario, P. Garzella, M. Toro, S. Micera, M. Alavi, U. Meyer,
E. Valderrama, L. Sebastiani, B. Ghelarducci, C. Mazzoni and
P. Pastacaldi IEEE Trans Rehabil Eng 6:4 353--63 1998
I was cheered by this article, since it shows that the INTER project
is still up and running; apparently they are working instead of
updating their website :-) What they have done is to microfabricate a
silicon die with microelectrodes on through-holes, put this inside a
polymer guidance channel, cut the sciatic nerve of rabbits and
inserted the ends into the channel. The severed nerves regenerated
through the holes and regained electrical functionality. By
stimulating the microelectrodes they could produce a visible leg/foot
contraction, and they could also record signals from the nerve. It
looks like a good step in the direction of neural interfaces.
A study of printed spiral coils for neuroprosthetic transcranial
telemetry applications
M. R. Shah, R. P. Phillips and R. A. Normann
IEEE Trans Biomed Eng, 45:7 867--76, July 1998
The trouble with the classic cyberpunk neural interface is that it is
a connector that breaks the skin; this is bad from an infection and
mechanics standpoint. A neater solution would be to have wireless
transmission, and this is used in many applications. However, most of
the systems use a rigid wire coil and this makes things tricky if you
want to put it inside the skull for a neurointerface (especially the
visual neurointerface University of Utah is working on). Shah and the
others have worked with copper on a polyimide surface, which is
flexible and hence can be placed so it follows the convoluted brains
surface. The prosthesis design would consist of a chip in the middle
of the plastic surface, surrounded by the telemetry coil and sending
thin spikes into the cortex to act as an electrode array. Looks
interesting, even if I have the impression they are rather far yet
from an useful complete system.
Viral mediated expression of insulin-like growth factor I blocks the
aging-related loss of skeletal muscle function
E. R. Barton-Davis, D. I. Shoturma, A. Musaro, N. Rosenthal and
H. L. Sweeney Proc Natl Acad Sci U S A, 95:26 15603--7, Dec 22 1998
As earlier mentioned on the extropians list. By injecting a
recombinant adeno-associated virus making the infected cells express
insuline-like growth factor I (IGF-I) they increased the muscle mass
and strength of young adult mice, as well as preventing most of the
aging-related loss of strength. IGF-I doesn't work that well when
injected directly (as well as having side effects in the rest of the
body), but if it is released locally the results are apparently good;
using this viral vector the enhancement was apparently local to only
the muscles (anterior muscle compartment of the right hind limb) where
the vector had been injected, it didn't affect the other side. This
result is good news not just for life extension and enhancement, but
also repair after wounds.
Terraforming Mars: A review of Research
by Martyn J. Fogg
http://www.users.globalnet.co.uk/~mfogg/paper1.htm
(at the Terraforming Information Pages)
A short review of the main concepts that have been discussed in the
mars terraforming literature. Discusses the demands for ecopoiesis
(getting a biosphere of any kind "up and running") and turning Mars
more terrestrial; the general conclusion seenms to be that it will
never become an Earth II, but quite possibly a lifebearing planet on
its own. As in all terraforming discussions, the main question is how
much carbon dioxide there is available on Mars and in what form, we
really need to know more about it to say what means could suffice to
release it and start a runaway greenhouse effect to make it more
life-compatible. The conclusion seems to be that we need a human
colony (or firm robotic presence) to find out the necessary data.
Self-Referential Noise and the Synthesis of Three-Dimensional Space
Reginald T. Cahill and Christopher M. Klinger
http://xxx.lanl.gov/abs/gr-qc/9812083
Another attempt at getting a 3+1 dimensional spacetime out of random
graphs; I must admit that I have a fondness for this kind of thinking,
even if it so far has not been very successful. This paper in many
ways reminds me of Greg Egan's novel _Distress_, in that they want to
have a bootstrap model of reality that bootstraps logic itself in a
self-consistent way. The authors try to build a model without even
assuming objects or axioms, just processes (they call it a Heraclitean
Process System). The idea is that if the universe is in a state of
self-organized criticality on all levels, then the axioms underlying
all this can simply be lost and replaced with universality. You get
quantum "noise" due to the irremovable non-local randomness due to
Gödel/Chaitin-like effects in arithmetic. However, while I find the
philosophical section fun, the actual model they experiment with to
bootstrap physics feels rather ad hoc. It produces "spacetimes" that
I'm not convinced look like ours despite the authors'
arguments. However, it is a fun approach to the question of the deep
ontology of physics and could perhaps be read as a kind of Eganesque
entertainment.
Quantum Smart Matter
Proceedings of the Workshop on Physics and Computation 1996
Eds T. Toffoli et al, 147--152
http://www.parc.xerox.com/istl/groups/iea/www/quantumMEMS.html
It is a natural extension of the idea of smart matter (i.e. matter
with internal sensors and actuators) to think of quantum smart matter
- they act on the quantum scale. Quantum smart matter might have very
interesting properties (as if smart matter hadn't). Using quantum
interference the probability of undesirable behaviors could be damped,
and quantum parallelism might enable subtle control over local
potentials enabling all sorts of fun things: active caumoflage,
materials changing lattice structure to suit demands, active quantum
springs, adjust the propagation of phonons or the specific heat, as
well as modifying mechanical and optical properties. Dispersed smart
matter might control reaction rates in solutions. Makes nanotech look
like just the first step towards truly deep control over matter. Lots
of fun possibilities, although they are rather theoretical at the
moment as we don't have good quantum computers, nanotech or the
control theory tools to handle the kind of bottom-up control smart
matter suggests.
Testing the Small World Hypothesis on the Web
Lada Adamic, http://www.parc.xerox.com/istl/groups/iea/www/SmallWorld.html
Small world graphs are graphs where nodes are highly clustered but
there are a few paths making the distance between any two nodes rather
short. Examples include collaboration graphs of actors ("Six degrees
of separation from Kevin Bacon") and mathematicians (Erdös numbers),
the nervous system of C Elegans and power grids. This article shows
that the WWW exhibits a similar structure, and suggests a search
engine exploiting this - use the already found members of a particular
sought cluster to find the other members of the cluster. It also has
some marketing applications, and can say a bit on the differences in
organization between different groups (in the article pro-choice
people, pro-life people and UFOlogists).
Beehive: A System for Cooperative Filtering and Sharing of Information
Bernardo A. Huberman and Michael Kaminsky
http://www.parc.xerox.com/istl/groups/iea/www/beehive.html
Another fun Xerox paper. The idea is to semi-automatically build lists
of membership in informal communities from an analysis of mailing
habits (who sends mail to who; implemented as a script looking at mail
headers) and then use it to make it simple to disseminate information
to other members by simply dropping it onto an icon for the community
("coworkers", "transhumanists", "family" etc).
Other reading:
Right now I'm reading up on the classics, stuff that I think a
transhumanist scientist should have read:
Probability Theory: the Logic of Science bt E. T. Jaynes
Fulltext (but missing certain pieces) at
http://omega.albany.edu:8008/JaynesBook
Bayesian statistics, quite nicely written in places (and hard in
others). The discussions of inference and the "robot" might be of
interest to people into PCR and the questions about what kinds of
minds can exist.
The Evolution of Cooperation by Robert Axelrod
Very interesting discussions about the prisoners' dilemma and how
cooperation might emerge, be encouraged or sabotaged. A bit dated in
some places, as evolutionary game theory have moved on with more
extensive simulations, but still essential reading.
Information, Randomness and Incompleteness (Series in Computer Science
: Volume 8) by G. J. Chaitin
Fun, mind-stretching papers about algorithmic information theory: how
much information is there in a string of bits? What is randomness? Is
arithmetic random? How does this relate to life? People who loved
_Gödel, Escher, Bach_ will likely enjoy this, even if it is presented
in an infinitely dryer form than Hofstadter did. The introduction
chapter and some of the papers are quite readable for a layman, I
think, while the later theoretical chapters are rather technical. But
it is nice to see somebody so comitted to the beauty of LISP :-)
The Two cultures by C.P. Snow
C.P. Snow's classical and controversial Rede lecture about the split
between the scientists and liberal arts people. Still as actual today
as then, even if the situation has become even more complex. Hopefully
we transhumanists can form a viable synthesis.
-- ----------------------------------------------------------------------- Anders Sandberg Towards Ascension! asa@nada.kth.se http://www.nada.kth.se/~asa/ GCS/M/S/O d++ -p+ c++++ !l u+ e++ m++ s+/+ n--- h+/* f+ g+ w++ t+ r+ !y
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