Area LIP of the parietal cortex is related to saccades, to visual attention, and additional related cognitive processes, and contains neurons that show persistent activity in memory-guided saccades. The talk will focus on comparisons of the neuronal activity (1) during memory-saccades towards versus opposite the target's direction (prosaccades and antisaccades), and (2) during memory-saccades comprising unguided choice versus guided-choice. We will consider computational problems and other implications arising from the results.