The invention is a
system (1) that simulates a
decision process in a
mammalian brain with respect to a motion characteristic relating to a visually observed
body posture of a body by means of a simulated visual path comprising an interface towards a simulated neuronal structure, the
system includes an interface that converts at least
luminescence information of the observed body into an
optical flow data stream that delivers information relating to the visually observed body and that can be processed in the simulated
neuron structure, the
system being a feed-forward system that can be coupled to the simulated
neuron structure. And from the
visual observation that the decision comprises hierarchically: the simulated visual path and its interface (3, 3L, 3R); a simulated local
motion direction detection
neuron structure (4, 4L, 4R) for detecting the
motion direction by means of a
receptive field; a simulated opposition
motion detection neuron structure (5, 5L, 5R) for detecting opposition motion at least relating to expansion and contraction; a simulated complex
pattern detection neuron structure (6, 6L, 6R) for globally detecting an
optical flow pattern over the entire
visual observation and according to the evolution of the entire
visual observation during the time, the detectable pattern being a prototype pattern; and a simulated motion
pattern detection neuron structure (7, 7LR) for detecting a motion pattern and providing a decision regarding a motion characteristic. According to the invention, the neurons of the simulated motion
pattern detection neuron structure (7, 7LR) comprise a forgetting ability that is a function of the
delay and for each neuron an activity of the neuron.