Multichannel Systems MC_Rack Manual - Manual (Page 63)

Step by Step Tutorial
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Selection of stimulation electrodes
Click the “Channels” tab to assign the programmed stimulation patterns to individual electrodes,
and to activate the blanking circuit BC, and to operate the “List Mode”.
To apply the stimulation pattern of a specific stimulation channel (Stim. 1, 2 or 3) to one or more
electrodes, select the desired stimulation channel (Stim. 1 to 3) and click the electrodes you want
to apply this paradigm to. To apply the stimulation pattern to all electrodes, click the button “All”
below the grid. Electrodes can be grounded or selected as regular recording electrodes (Not Stim.)
in the same way.
Electrodes selected for stimulation pattern 1 “Stim.1” are colored in blue, for stimulation pattern
2 “Stim. 2” are colored in red, or stimulation pattern 3 “Stim. 3" are colored in yellow. To cancel a
stimulation electrode, please use the radio button “Not Stim.” and click on the selected electrode.
Blanking
The blanking feature to avoid stimulation artifacts can be activated or deactivated via the check
box “Blanking”.
A blanking signal transiently switches off the input stage of the amplifier during the stimulus,
thus avoiding stimulus artifacts on non-stimulating electrodes.
Amplifier saturation is effectively prevented and the recovery time is greatly reduced. During the
blanking period, a flat line is displayed. This blanking period extends a few hundred microseconds
before and after the actual stimulus, currently 600 μs, but might be subject to change. The pre-
and post-time are experimentally optimized and can not be changed by the user.