Ian C. Fiebelkorn, Yuri B. Saalmann, Sabine Kastner  Current Biology 

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Rhythmic Sampling within and between Objects despite Sustained Attention at a Cued Location  Ian C. Fiebelkorn, Yuri B. Saalmann, Sabine Kastner  Current Biology  Volume 23, Issue 24, Pages 2553-2558 (December 2013) DOI: 10.1016/j.cub.2013.10.063 Copyright © 2013 Elsevier Ltd Terms and Conditions

Figure 1 The Experimental Design (A) A schematic of a validly cued trial (i.e., the visual target occurred at the cued location). We measured behavioral performance (i.e., detection of a near-threshold visual target) at different cue-to-target intervals. The length of the cue-to-target interval was measured relative to the onset of the cue. (B) The conditions, which were defined by both the cue and the orientation of the two bar-shaped objects. We tracked visual-target detection at a cued location (i.e., under conditions of space-based selection), an uncued location within the same object (i.e., under conditions of object-based selection), and an uncued location within a different object (i.e., in the absence of space- and object-based selection). The same- and different-object locations were equidistant from the cued location. Current Biology 2013 23, 2553-2558DOI: (10.1016/j.cub.2013.10.063) Copyright © 2013 Elsevier Ltd Terms and Conditions

Figure 2 Visual-Target Detection under Conditions of Both Space- and Object-Based Selection Reflects Increased Theta-Band Synchronization (A) Visual-target detection at the cued (black line), same-object (orange line), and different-object (blue line) locations as a function of the cue-to-target interval. (B) Visual-target detection at each location following detrending to isolate periodic effects. (C) A frequency domain representation of the time-series behavioral data shown in (B). The dashed lines represent the cutoff for statistical significance (p < 0.05) after corrections for multiple comparisons. (D) Significant cross-condition phase coherence (p < 0.05) at 8 Hz between the cued and same-object locations. Each participant’s phase difference is plotted on the circle, and the vector points toward the average phase difference. Current Biology 2013 23, 2553-2558DOI: (10.1016/j.cub.2013.10.063) Copyright © 2013 Elsevier Ltd Terms and Conditions

Figure 3 Enhanced Visual-Target Detection under Conditions of Space- and Object-Based Selection (A) Difference between visual-target detection at the cued and different-object locations (black/blue line) and the difference between visual-target detection at the same- and different-object locations (orange/blue line). The bars above the traces represent time points when the effects of space- (black bar) and object-based (orange bar) selection were significantly greater than zero. The effects of space-based selection on visual-target detection were sustained, whereas the effects of object-based selection were only intermittently significant. (B) Frequency domain representation of the time-series data shown in (A). The dashed lines represent the cutoff for statistical significance (p < 0.05) after corrections for multiple comparisons. (C) Significant cross-condition phase coherence (p < 0.05) at 4 Hz between the same- and different-object locations. Each participant’s phase difference is plotted on the circle, and the vector points toward the average phase difference. An antiphase relationship between detection rates at the same- and different-object locations creates periodicity in the effects of object-based selection (at 4 Hz). Current Biology 2013 23, 2553-2558DOI: (10.1016/j.cub.2013.10.063) Copyright © 2013 Elsevier Ltd Terms and Conditions