Unformatted text preview: itself. Randomly assign to each synapse a time in the range [0.4,0.9] msec that accounts for the time it takes for a spike to travel down the axon and reach that synapse. Use the following functions to model the postsynaptic potentials at the synapses Excitatory : Q α √ t exp (-α 2 /t ) exp (-t/τ ) set Q in the range [5,10], set α in the range [1,2] and τ = 20 msec. Inhibitory :-Q α √ t exp (-α 2 /t ) exp (-t/τ ) set Q in the range [30,60], set α in the range [1,1.1] and τ = 20 msec. AHP:-1000 * exp (-t/ 1 . 2) Start with different thresholds (5 mV for excitatory and 10 mV for inhibitory) for each neuron and play with the thresholds so as to stabilize the system to sustained recurrent activity. Plot the spike trains for 250 neurons in the population, as well as the total number of spikes generated in the system over the past 100 msec. 1...
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- Spring '08
- Algorithms, Chemical synapse, 80%, 100 pts, Computational Neuroscience Spring