[Background impulse activity of cat pericruciate cortex neurons]

Background spike activity of 66 neurons was recorded extracellularly in the pericruciate cortex of narcotized cats. As a rule it is represented by an irregular spike sequences and occasionally by a burst of two-five spikes. In 77.3 per cent of units the mean frequency of the background activity varied from 0.6 to 20 imp/s, in the other it reached sometimes 100 imp/s. Types of interspike interval histograms are analyzed.