Goals dominate primate behavior. Almost all intended behaviors depend on the acquisition of "cognitive sets" endowing us with expectations about classes of stimuli and responses (S-R sets) appropriate to achieve a particular goal in a given context. Selective attention allows to switch between competing cognitive sets by focusing onto the currently relevant S-R sets while disengaging from other interfering S-R sets. The question whether non- human primates provide an appropriate model for human task-switching has not been completely answered. Posterior Parietal Cortex (PPC) has long been...