Kresimir Josic, Math at University of Houston The impact of patterned activity in networks of neurons in the central nervous system has been the source of much controversy. With the development of multielectrode recording and optical stimulation techniques experimental neuroscientists are in a position to address this question experimentally by controlling the pattern of inputs to a single cell, or groups of neurons. Since the number of possible spatiotemporal patterns that can be presented is enormous, it is impossible to examine the impact of all of them. The spiking activity of groups of cells is therefore characterized using different statistics. The goal of this project is to generate non-stationary point processes (spike trains) with predetermined characteristics and try to understand how they determine the output characteristics of a neuronal network.