p287fig07.06 The relative durations of persistence that occur due to an adaptation stimulus of the same or orthogonal orientation follow from the properties of the habituative gated dipoles that are embedded in the boundary completion system.<BR>||  Persistence data and simulations.  Change in persistence depends on whether adaptation stimulus has same or orthogonal orientation as test grating (Meyer, Lawson, Cohen 1975).  If adaptation stimulus and test stimulus have the same orientation, they cause cumulative habituation, which causes a stronger reset signal, hence less persistence.  When they are orthogonal, the competition on the ON channel is less, hence more persistence.