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FOCUS III (lesion)
movie (3.5 MB):
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Figure 3 Pattern of activity in an array of 24 by 24 columns.
Only the pattern of activity in excitatory neurons in the array is shown
(216 x 216 neurons). The simulated "lesion" (40% of excitatory synapses are
inactive) covers the area of 6 by 12 columns. The network was activated by
background action potentials applied on inputs of all neurons at t=0. The
activity in the network continues without additional background input. The
mechanism of self-sustained activity relays on neurons in the "lesion" that
do not fire synchronously and are in phase with neurons in the surrounding
area. In the surrounding area neurons fire synchronous bursts followed by
a refractory period caused by AHP. The activity in the "lesion" continues
until neurons in the surrounding area recover from AHP and hence induce recurrent
and synchronous bursts in the network.
Next: Conclusions
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Results 1