Abstract
Determining the synaptic connection structure of neuronal networks is critical for understanding the organization and function of the nervous system. Multi-neuron recordings such as multi-channel optical recordings (Cohen and Lesher 1986, Nakashima et al. 1992) and multi-unit extracellular recordings (Gerstein et al. 1983, Novak and Wheeler 1986, Wilson and McNaughton 1993) have been developed and shown to be useful in understanding the structure and function of neuronal networks. However, they do not provide any direct information about synaptic connectivity. Cross-correlation analysis of two action potential trains (Perkel et al. 1967a, 1967b; Gerstein and Aertsen 1985; Surmeier and Weinberg 1985; Melssen and Epping 1987; Palm et al. 1988; Aertsen et al. 1989; Yang and Shamma 1990) or three action potential trains (Perkel et al. 1975) has been widely used for this purpose. However, they pose some difficulties.
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