void IF2Group::integrate_nonlinear_nmda_synapses() { // decay of ampa and gaba channel, i.e. multiply by exp(-dt/tau) auryn_vector_float_scale(scale_ampa,g_ampa); auryn_vector_float_scale(scale_gaba,g_gaba); // compute dg_nmda = (g_ampa-g_nmda)*dt/tau_nmda and add to g_nmda AurynFloat mul_nmda = dt/tau_nmda; auryn_vector_float_saxpy(mul_nmda,g_ampa,g_nmda); auryn_vector_float_saxpy(-mul_nmda,g_nmda,g_nmda); // BEGIN implement NMDA voltage dependence auryn_vector_float_copy( mem, nmda_opening); auryn_vector_float_add_constant( nmda_opening , -e_nmda_onset ); auryn_vector_float_scale( nmda_slope, nmda_opening ); for ( AurynState * ptr = auryn_vector_float_ptr( nmda_opening , 0 ) ; ptr != auryn_vector_float_ptr( nmda_opening , get_post_size()-1 )+1 ; ++ptr ) { AurynFloat x = *ptr; AurynFloat x2 = x*x; AurynFloat r = x2/(1.0+x2); if (x>0) *ptr = r; // rectification else *ptr = 0; // cout << *ptr << endl; } // END implement NMDA voltage dependence // excitatory auryn_vector_float_copy(g_nmda,t_exc); auryn_vector_float_scale(-A_nmda,t_exc); auryn_vector_float_mul(t_exc,nmda_opening); auryn_vector_float_saxpy(-A_ampa,g_ampa,t_exc); auryn_vector_float_mul(t_exc,mem); // inhibitory auryn_vector_float_copy(mem,t_inh); auryn_vector_float_add_constant(t_inh,-e_rev); auryn_vector_float_mul(t_inh,g_gaba); }
void TIFGroup::init() { e_rest = -60e-3; e_rev = -80e-3; thr = -50e-3; tau_ampa = 5e-3; tau_gaba = 10e-3; tau_mem = 20e-3; set_refractory_period(5e-3); calculate_scale_constants(); ref = auryn_vector_ushort_alloc (get_vector_size()); bg_current = get_state_vector("bg_current"); t_g_ampa = auryn_vector_float_ptr ( g_ampa , 0 ); t_g_gaba = auryn_vector_float_ptr ( g_gaba , 0 ); t_bg_cur = auryn_vector_float_ptr ( bg_current , 0 ); t_mem = auryn_vector_float_ptr ( mem , 0 ); t_ref = auryn_vector_ushort_ptr ( ref , 0 ); clear(); }