Experiments were performed on cats under chloralose and flaxedil. Evokedunit discharges recorded in contralateral somato-sensory cortex to noxiousstimulating superficial peroneal nerve (P-ED) were analysed quantitativelywith micro-computer using the method of stochastic point process for signalanalysis in order to study the effects of electro-acupuncture(EA)and morphineon non-time-lock response(N-TLR) and time-lock response (TLR) of nociceptiveunit discharges. N-TLR was shown by interspike interval mean function(ISIMF).TLR was shown by normalized cross-covariance function (NCCVF) reflectingthe relationship between stimulation and response. The results were testedstatistically.