Classes of unitary evoked responses at the vertebrate neuromuscular junction

Unitary evoked quantal responses at the frog and mouse neuromuscular junctions were found to have preferred latencies. Focal recordings indicate reproducibility of both conduction time and synaptic delay of the clustered responses. Clusters of responses with similar time courses which often occurred together in series of 100 responses were detected using a microcomputer program. These results demonstrate that the probability of release is not uniform along the length of the terminal.