Patrick Cavanagh and Mark Wexler:
Build a system mounted on a stereophonic earphone frame. Use gold cup
electrodes with electrode paste (the paste must be replaced every hour
because of uncomfortable drying). For horizontal saccades, place the
electrodes at the internal and external canthi of one eye. For vertical
saccades, place one electrode just above the upper eyebrow and the other on
the skin over the orbicularis muscle on a vertical line through the pupil in
the primary position. Connect the two electrodes into a differential
amplifier RC circuit, grounding (earthing) through a third electrode in the
middle of the forehead. Power this preamplifier with a battery and feed the
output to a radio transmitter or long tether to a primary amplifier and
recording device (this makes the head mount light and eliminates shock
hazards).
Michael C. Barris, Ph.D.
154 Center Street
Fredonia, New York 14063, USA
716-673-9094
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----- Original Message -----
From: "Patrick Cavanagh" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, September 21, 2011 3:24 PM
Subject: [EM_LIST] EOG saccade detector
EOG saccade detector
We'd like to build or buy a light-weight, portable EOG system that
subjects can wear while walking. The goal is to quickly (in less than
5 ms) detect saccade onset, rather than measure precise eye
position.
More fundamentally, we're looking for basic EOG know-how. What kind of
electrodes and amplifiers should we use? Where do we put the
electrodes? Should we filter? Do we need to buy expensive and heavy
bio-amplifiers, or is there anything cheap and light-weight out there?
Does anyone have any experience with the OpenEEG designs
(http://openeeg.sourceforge.net/doc/modeeg/modeeg.html,
http://www.olimex.com/gadgets/index.html)?
Commercial devices that we have tested all do data logging with
considerable delays before data transfer.
We promise to post a digest of all EOG wisdom!
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Patrick Cavanagh and Mark Wexler
Laboratoire Psychologie de la Perception
Université Paris Descartes
Centre Biomédical des Saints Pères
45 rue des Sts Pères
75006 Paris
France
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