Extended Data 8. Narrowband filters fail to detect any significant wave phase alignment prior to target onset.

(a) The cross-trial phase alignment computed as in Figure 3, but using a narrowband alpha (8–13 Hz) filter, does not show any significant alignment (gray dashed line) for hits (blue) or misses (gray) prior to target onset (gray region) for either monkey T (top) or monkey W (bottom). (b) The same as in (a), but for a beta (15–30 Hz) narrowband filter.