Figure 14.

Frequency tagging used to study feature-based attention. Top panel: schematic illustration of moving-bar stimuli. The horizontal and vertical bars oscillated at slightly different frequencies. Occlusion cues were used to cause one set of bars to be seen in front of the other set. Lower panel: The stimulus to which attention was directed resulted in a higher amplitude response at the second but not the fourth harmonic. Figure composed from Pei et al. (2002).