Stimuli’s parameters.

Stimuli are generated on a space defined in absolute values (ranging arbitrarily from −1 to 1) and time defined from t = 0 to t = T (in seconds). As such, stimulus parameters are defined in these units. To avoid border effects, the spatio-temporal domain is defined as a 3-dimensional torus (that is the cartesian product of the periodic real spaces ). By convention, a speed of 1 is defined as a motion of one spatial period in one temporal period.