Horacio G. Rotstein, PhD, assistant professor in the department of mathematical sciences at NJIT, will discuss "The Mechanism of Abrupt Transition from Normal to Epileptic Spiking Activity in Medial Entorhinal Cortex Layer II Stellate Cells" at the Mathematical Biology Seminar Series on Oct. 28 at 4 p.m. in Cullimore Hall Room 611.