Statistical method for determination of interspike interval probability density function

Assuming homogenity of the underlying statistics, interspike interval probability density functions recorded from behaving macaque monkeys are determined with a special statistical fitting method. The nature of the problem needed robust statistics approach, the results were validated with the Kolmogorov-Smirnov test. The results suggest that there is no single/universal interspike interval probability density function, but many, and the underlying statistics is definitely not Poissonian.