A model for the determination of VECP latencies

The time between stimulus event and onset of the visually evoked cortical potential (VECP) reflects the dynamic transmission characteristics of the precortical part of the visual system. A simple mathematical model describing this sub-system with regard to the triggering of luminance VECP is presented. The four functional parameters of the model can be calculated from the measured latency versus stimulus intensity curve of luminance VECP and can provide a quantitative evaluation of the functional state of the precortical visual system for clinical use. Some experiments and first clinical results show the applicability of the model.