In 1980, Rudolf Groner initiated an interdisciplinary network called "European Group of Scientists active in Eye Movement Research".
This group includes scientists who use eye movement registration as a research tool and develop models based on oculomotor data obtained from a wide spectrum of phenomena, ranging from the neurophysiological to the perceptual and the cognitive level.
[3] From 1970 to 1990 Rudolf Groner's research interests focused on the mathematical modeling of complex cognitive activities by elementary modules.
[4] These modules consist of basic perceptual and attentional processes, and the visual information input is measured by parameters of eye fixations.
The distribution of time spent during problem solving and the probability of erroneous solutions could be predicted by one and the same model that assumes minimal short term memory load which, however, must be compensated by extensive visual scanning of available information from the environment.