< [[neurali:annarchy]] =====Sinapsi predefinite ANNarchy====== http://annarchy.readthedocs.io/en/latest/_modules/ANNarchy/models/Synapses.html [[neurali:spiking_model_annarchy#spiking_synapse|DefaultSpikingSynapse]], STP, STDP, Hebb, Oja, IBCM Sono di tipo rate-coded: * DefaultSpikingSynapse * Hebb * Oja * IBCM ====Default==== http://annarchy.readthedocs.io/en/latest/_modules/ANNarchy/core/Projection.html > By default, the synapse only ensures linear synaptic transmission: > > * For rate-coded populations: ``psp = w * pre.r`` > * For spiking populations: ``g_target += w` =====STP===== sinapsi di tipo **spinking model** con potenziamento e depressione a breve termine, implementata usando il modelllo di Tsodyks, Markram et al. ^ par ^ valore ^ descrizione ^ | tau_rec | 100.0 | depression time constant (ms) | | tau_facil | 0.01 | facilitation time constant (ms) | | U | 0.5 | use parameter | time constant of the post-synaptic current, nel modello del neurone... ^ var ^ descrizione ^ equazione ^ | x | recovery variable | dx/dt = (1 - x)/tau_rec | | u | facilitation variable | du/dt = (U - u)/tau_facil | ^ vocabolario ^ valore ^ | pre_spike | g_target += w * u * x | | | x *= (1 - u) | | | u += U * (1 - u)| =====STDP ===== Spike-Timing Dependent Plasticity ^ par ^ valore ^ descrizione ^ | tau_plus | 20.0 | time constant of the pre-synaptic trace (ms) | | tau_minus | 20.0 | time constant of the pre-synaptic trace (ms) | | A_plus | 0.01 | increase of the pre-synaptic trace after a spike | | A_minus | 0.01 | decrease of the post-synaptic trace after a spike | | w_min | 0.0 | minimal value of the weight w | | w_max | 1.0 | maximal value of the weight w | ^ var ^ descrizione ^ equazione ^ | x | pre-synaptic trace | tau_plus * dx/dt = -x | | y | post-synaptic trace | tau_minus * dy/dt = -y | ^ Vocabolario eventi ^ valore ^ | pre_spike | g_target += w | | | x += A_plus * w_max | | | w = clip(w + y, w_min , w_max) | | post_spike | y -= A_minus * w_max | | | w = clip(w + x, w_min , w_max) |