m8ta
You are not authenticated, login.
text: sort by
tags: modified
type: chronology
{823}
hide / / print
ref: Kruger-2010.05 tags: microelectrode array nichrome 7 years rhesus electrophysiology MEA Kruger oblique inverted date: 01-29-2013 07:54 gmt revision:7 [6] [5] [4] [3] [2] [1] [head]

PMID-20577628[0] Seven years of recording from monkey cortex with a chronically implanted multiple electrode.

  • Seven years!! good recordings the whole time, too. As they say, this is a clinically realistic time period. Have they solved the problem?
  • Used 12.5um Ni-Cr-Al wire insulated with 3um of polymide.
    • Wires were then glued to an 8x8 connector block using conductive epoxy.
    • Glued the bundle together with a solution of plexiglas in dichloroethane.
    • Then introduced the 0.3mm bundle into a j-shaped cannula. This allowed them to approach the gray matter inverted, from below (the white matter).
    • implanted 64 ch array into ventral premotor cortex (arm representation?).
  • No apparent degradation of recording quality over that time.
  • Had some serious problems with the quality of their connector.
    • They recommend: "Rather, the contacts on the head should be made from noble metals and be flat or shallowly hollow, so that they can be easily cleaned, and no male contacts can break."
    • Really need to amplify and multiplex prior connector (imho).
  • Claim that them managed to record from two neurons on one channel for nearly 7 years (ch 54).
  • They cite us, but only to indicate that we recommend slow penetration of the brain. They agree with our results that lowering of individual electrodes is better than all at once.

____References____

[0] Kruger J, Caruana F, Volta RD, Rizzolatti G, Seven years of recording from monkey cortex with a chronically implanted multiple microelectrode.Front Neuroengineering 3 Issue 6 (2010 May 28)

{722}
hide / / print
ref: notes-0 tags: programming excellence norvig 10 years date: 04-07-2009 20:26 gmt revision:0 [head]

Teach yourself programming in 10 years

  • points out that, in order to be excellent at any difficult skill/art, you must practice 10 years or 10,000 hours, and this practice must be focused and deliberate.
    • quote: "have shown it takes about ten years to develop expertise in any of a wide variety of areas, including chess playing, music composition, telegraph operation, painting, piano playing, swimming, tennis, and research in neuropsychology and topology"
    • possibly this is partially due to competition - most other people drop out after 10 years!
    • Or this is due to the fact that, for general purpose behaviors, we are really no better than the present gradient descent & reinforcement learning algorithms which require repeated presentation of patterns and behaviors. Where humans achieve sub-gradient/RL performance is where evolution has supplied us with hardware or 'prior assumptions' to bias for a correct solution / correct solution space. These prior assumptions are (part of) that which the make study brain interesting!
  • "Life is short, [the] craft long, opportunity fleeting, experiment treacherous, judgment difficult." -- Hippocrates.

{442}
hide / / print
ref: bookmark-0 tags: language learning year french brain hack date: 09-03-2007 04:13 gmt revision:2 [1] [0] [head]

http://mirror.mricon.com/french/french.html -- "how i learned french in a year"

  • verbiste : verb conjugator for linux (Gnome)
  • When talking about software, it was FredBrooks in TheMythicalManMonth who said that people will always reinvent the wheel because it is intrinsically easier and more fun to write your own code than it is read someone else's code.