Multichannel Systems MC_Rack Manual - Manual (Page 138)

MC_Rack Manual
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In case of rate detection, the logical state becomes TRUE from the detection point of the last
event that is needed to fulfill the rate condition till the end of the event duration. If the rate of
detected events stays above the rate threshold, the logical state will remain TRUE as long as the
rate condition is fulfilled. In the example below, a window of 200 ms and a rate of five events
per window is set as condition. The logical state becomes TRUE upon detection of the fifth spike
within 200 ms, and stays TRUE because the event rate remains above threshold.
As shown above the status of the TTL output bit will remain HIGH as long as the logical state,
or the combination of logical states of all selected electrode channels, fulfils the condition defined
by the user, including the AND / OR function.
Note: More complicated operations are possible when using custom software to control the DSP.
Real-time Feedback Display Window
The Real-time Feedback tool automatically opens a display window, which will show the raw data
or data filtered by the digital hardware filter of the real-time feedback tool, the spike detection
level and the TTL feedback signal. The starting point of the trigger is marked by the small triangle
above. The duration of the trigger is indicated. You can change the color of all traces with a right
click onto the trace, as usual.
If one electrode is used for more than one logical block, the detected events and resulting
TTL pulses for all applicable logical blocks will be indicated in the data window of that electrode.
Turn on the “display labels” function with a right mouse click to see which trace belongs to which
digital output bit. See red trace for D0 and green trace for D1 in image below.
If two or more electrodes are combined with the condition OR, detected events on any of the
combined electrodes will be indicated in each electrode data display. See dashed line in image
below: An event is detected on the lower electrode only, but is indicated with a red triangle in
both electrodes’ displays, as these electrodes are combined with the condition OR.