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Biosensor Array Galvanic Skin Response (view source)
Revision as of 19:51, 1 May 2011
, 19:51, 1 May 2011→Finger contacts
* Neither thumbtack or nut is ideal as one needs to press against or hold onto. Ideally for the biosensor array, one needs to be able to move freely within the classroom
* Neither thumbtack or nut is ideal as one needs to press against or hold onto. Ideally for the biosensor array, one needs to be able to move freely within the classroom
* Both one and two finger straps generate a good signal if hand is held still. However, movement of the finger like bending causes the contact between the skin and cuff to change which alters the resistance. This registers as a false positive GSR event.
* Both one and two finger straps generate a good signal if hand is held still. However, movement of the finger like bending causes the contact between the skin and cuff to change which alters the resistance. This registers as a false positive GSR event.
* I contacted [http://produceconsumerobot.com/truth/ Sean Montgomery] regarding this problem who gave this [[Biosensor Array Galvanic Skin Response Spurious Input | advice on spurious input]].
* I contacted [http://produceconsumerobot.com/truth/ Sean Montgomery] regarding this problem who gave this [[Biosensor Array Galvanic Skin Response Spurious Input | advice on spurious input]]:
<code>
"The problem you're experiencing is that when you move, you change the amount
of contact between your finger and the electrode, thereby changing the
resistance of the junction... exactly what the GSR is measuring. You can try
to find a part of the body that is less likely to move during your
behaviours of interest. I've gotten decent GSR from the wrist and not much
success from the forehead, but fingers are the best I've found. You
can measure GSR from numerous locations and reject spurious changes that
only occur on one or two of the locations. You can also try to characterize
the waveshape of real GSR responses and reject resistance changes that don't
fit that criteria."
</code>
== Measuring Actual Skin Conductance ==
== Measuring Actual Skin Conductance ==
