Fig. 5.

Range of bistability is enhanced with facilitating synapses and reduced with depressing synapses. a Low threshold, with ${\beta }_2=0.301$. b High threshold with ${\beta }_2=1.001$. a, bWhite region, all models (with static, facilitating and depressing synapses) are bistable; yellow region, models with static or facilitating synapses are bistable; orange region, only models with facilitating synapses are bistable; black region, no models are bistable