Global potential landscape w.r.t the pyramidal neuron activity x1, for different values of DA releasability W34.

The profiles are obtained from the steady state distributions in variable x1 for different values of W34. Here, the lower stable state represents the spontaneous-activity state and the higher stable state represents the sustained-firing state (working memory state) of the system. The system has been depicted by a ball sitting in the potential wells belonging to the different activity states. At low W34, the system (ball) prefers to rest in the well associated with the lower stable state as it is relatively more robust in comparison to its corresponding higher stable state. However, with the increase in W34, the higher stable state gradually becomes more robust relative to the corresponding lower stable state.