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Different phenomena are found in the phase characteristics between pre-synapse neuronal activities and post-synapse activities, that is observed from human EEG, appeared in the states of its spacial mode and the instantaneous alternations of phase states. It is assumed that there would be a mutual interaction by the internal mechanism between two neurons, passing through the only one synapse. We put forward a model, in which the event is caused by making the synaptic connection temporally and spontaneous1y, that is the trigger of the mutual interaction on phase states with transmitting a signal from the post-synapse to pre-synapse. Two potential barriers are described on the synapse, with being supposed that the opening and emitting mechanism for transmitters a1so exists in the post-synapse. If the energy is 1ocally induced, the control factors related to the activities of synaptic vesiculars are released, this factor acts on the barriers and the causality over neuronal activities are spontaneously emerged.