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Further evidence supporting the view that the PPC is involved in sensorimotor transformations comes from studies that elucidate the dynamic evolution of PPC activity during the task , changing in nature from sensory to cognitive to motor with the evolution of the task . For more information about Northrop Grumman , click here . Because neurons that signal illusory contours are only a subset of the cells that signal contrast edges , orientation-dependent adaptation aftereffects should transfer from contrast-defined to illusory contours , but not in the reverse direction , and the discrimination of orientation should be less accurate for illusory contours than for contrast-defined contours . In several of the sections that follow , we will present various join queries on the system catalogs that display information we need to extend the system . Recall that when the diamonds carry near disparity , they float freely in front of the background , and the illusory triangle tends to be seen as figure .