Summary: Minicolumn has been widely accepted not only as the basic structural element of the cortex anatomically, but also as the fundamental functional unit physiologically. And, it is believed by many theorists that the minicolumn may function as a Potts spine, only takes on finite discrete states. But its feasibility is unclear. In order to provide a biophysical evidence for the Potts assumption, a model is proposed to analyze the dynamics of minicolumn. With simulation, we found that Potts states may originate from the temporary high synchronization of neuronal subsets. Furthermore, after analyzing the average number of synchronous spiking neurons, we propose a novel and important assumption that, intrinsically-busting neurons may play a critical role in stabilizing the Potts states.