Two hypotheses concerning the areas that encode and maintain instruction signals. Hypothesis#1 asserts that both ventral and dorsal visual areas are used during both encoding and maintenance, whereasHypothesis #2 asserts that ventral areas assist during encoding but that the resulting instruction signals are maintained in parietal and possibly precentral regions.PrCs, Precentral sulcus; a, anterior;p, posterior; v, ventral;Fus, fusiform gyrus.