Fig. 6.

Total alpha activity tracks stimulus location when the stimulus remains in view. Location CTFs reconstructed from evoked (A) and total (B) alpha (8–12 Hz) activity during the spatial WM task with a long encoding period (1,000 ms; experiment 2). Despite the stimulus remaining in view from 0 to 1,000 ms, total alpha power tracked stimulus location during this period, demonstrating that total alpha power tracks spatial representations both in the presence and absence of visual input. Evoked alpha power showed reliable but weaker location selectivity during the delay period. White markers along the top of the panels indicate the points at which CTF slope was reliably above chance as determined by a permutation test.