STDP Synapses

1. We're going to do some exploration of plastic synapses. Get lab5.py or the text version .
2. Run it and print out the output spikes.
3. Now, at step 3 in the code, comment in the projection, but make sure to comment out the projection above.
4. What changing the comment does is switch from a static synapse to a plastic one. Notice how the second spike from the output neurons is faster. The weight has increased.
5. Explore parameters on the spike_pair rule like tau_plus and A_plus. Look at the pyNN documentation on http://neuralensemble.org/docs/PyNN/ .
6. Explore parameters on the multiplicative weight dependence like w_min and w_max.
7. Can you replace multiplicative weight depence with additive weight dependence.
8. Can you print out the synapse weight?
9. Lower the weight.
10. Can you get the weight to go down (you can use an extra spike source on the output neuron)?