Poster presented at CNS*98, Santa Barbara, California, July 26-30, 1998. Simultaneous Paired Intracellular and Tetrode Recordings for Evaluating the Performance of Spike Sorting Algorithms M. Wehr, J. S. Pezaris, and M. Sahani Computation and Neural Systems Sloan Center for Theoretical Neurobiology California Institute of Technology, Pasadena, CA 91125, U.S.A. Abbreviated Abstract Sorting an extracellular recording containing signals from more than one neuron into events assigned to distinct sources requires the use of a spike sorting algorithm. Evaluating the performance of such algorithms requires a priori knowledge of the firing times of these sources, such as is available from intracellular recordings. We present here data sets consisting of single and paired intracellular recordings from neurons which were simultaneously being recorded on a tetrode. This data is used to evaluate the linearity of extracellular recordings during overlapped events, and to evaluate our spike sorting algorithm for isolated as well as overlapped events. Fetch postscript of poster (1307 kB gzip compressed) Fetch postscript of proceedings preprint (1347 kB gzip compressed) John Pezaris, Caltech, Mail Code 216-76, Pasadena, CA 91125, john [at] pezaris [dot] com, 4 August 1998.