[ExI] Fwd: Brainport

[Bryan Bishop]

---------- Forwarded message ----------
From: Trent Waddington <trent.waddington at gmail.com>
Date: Thu, May 21, 2009 at 12:26 AM
Subject: Re: Brainport
To: Bryan Bishop <kanzure at gmail.com>


On Thu, May 21, 2009 at 11:38 AM, Bryan Bishop <kanzure at gmail.com> wrote:
> Tell me if you find anything new :-).

http://web.gc.cuny.edu/cogsci/private/bach-y-rita-tongue.pdf

Most detailed paper I've found.  And that's pretty sad.

The electrode array consisted of a 7x7 arrangement
of 0.89-mm diameter, flat-topped, stainless-steel elec-
trode pins, each surrounded by a 2.36-mm diameter
air-gap insulator.  A flat stainless-steel plate, coplanar
with the electrode pins, served as the return current
path.  The electrodes were arranged on a square grid
with 2.54-mm interelectrode spacing.

 A 16-channel electrotactile waveform generator
(VideoTact-4, Unitech Research Inc., Madison, WI) and
accompanying scripting software were used to specify
and control the stiumulus waveform, patten, and trial
events.  Active or 'on' electrodes (according to the
particular pattern) delivered bursts of positive, function-
ally monophasic, cpacitively coupled (zero net DC)
current pulses to the tongue.  The current was identical
fror all electrodes on the array.  Inactive or 'off' electrodes
were effectively open circuits.  Each active electrode
received bursts of three 25-us pulses, where the pulse
onsets were separated by 5 ms and the burst onsets by 20
ms.  Electrode activation was staggered by 102 us, so that
each electrode in the array could be pulsed once before
the next pulse in each burst.  Subjects could freely adjust
the stiumulation current during the experiment.
--

The software mentioned:

  http://www.4thtdev.com/videotac.html

Ya, that's worrying.

Trent



-- 
- Bryan
http://heybryan.org/
1 512 203 0507