Multichannel Systems NeuroExplorer - Manual (Page 107)

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
The computational algorithm works the following way. For each spike of a selected neuron,
NeuroExplorer identifies the images that precede the spike and are within the specified time interval
(between Tmin and Tmax; for example, if Tmin = -0.4 and Ymax = 0, NeuroExplorer will analyze all
the stimuli that were presented up to 400 msec before each spike).
Then, NeuroExplorer calculates the average of the presented stimuli over all the spikes. The result is
a 3-dimensional matrix (with X, Y, and Time dimensions, time axis is divided into bin of the specified
size).
Display option identifies what 2-dimensional view of this matrix is presented:
X vs. Y display shows an average stimulus image for the specified time slice
X vs. Time display shows average X pixels of the stimuli for the specified Y value
Y vs. Time display shows average Y pixels of the stimuli for the specified X value
Reference
Izumi Ohzawa, Gregory C. DeAngelis, and Ralph D. Freeman (1996). Encoding of binocular disparity
by simple cells in the cat's visual cortex. J. Neurophysiol. 75: 1779-1805.
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