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For example, if priming effects are comparable between the baseline and the spatiotopic condition, but are reduced in the other conditions, then this would count as evidence for spatiotopic priming �C because only in this and in the baseline condition would locational information, in terms #[http://www.selleckchem.com/products/r428.html BGB324 solubility dmso] randurls[1|1|,|CHEM1|]# of exact screen coordinates, be repeated across trials. In contrast, if positional priming is object-centered, then facilitation of target locations and/or inhibition of distractor locations should be equivalent between the baseline and all other conditions. This is because in all conditions, the three search items are ��linked�� within the same triangular configuration (object) and this pattern would be repeated across trials. Materials and Methods The general set-up was identical for Experiments 1 and 2. Participants performed a version of the priming of pop-out visual search task (Maljkovic and Nakayama, 1996). Across trials, the target-defining feature (color) and the response-defining feature (left/right orientation of the notch) were manipulated independently in addition to the location of the target (transition from preceding trial n-1 to current trial n): target-at-target, target-at-distractor, or target-at-neutral location.  Each experiment consisted of two sessions in which the items were presented along the horizontal and vertical displays axes (order of conditions counter balanced across observers) across the consecutive trials. In Experiment 1, cross-trial item displacements followed an invariant (��predictable��) sequence. In Experiment 2, in different sessions, search displays were presented in randomly chosen display regions across the horizontal or, respectively, vertical meridian (see Figure ?Figure22). Horizontal and vertical transitions were introduced to control for (minimize) the effects of visual factors on reference frame selection (Rubin et al., 1996; Laeng et al., 1998; Yeshurun and Carrasco, 1999; Carrasco et al., 2001; Corbett and Carrasco, 2011). For instance, Carrasco et al. (2001) found that detection performance across the visual field is inhomogeneous, with superior performance for targets positioned on the horizontal as  compared to the vertical meridian. It is thus possible that positional priming differs across the horizontal versus vertical hemifields. Participants Fourteen different observers participated in Experiments 1 and 2 (Experiment 1: female: 8; mean of age: 24 years, SD: 1 year; Experiment 2: female: 13; mean of age: 27 years, SD: 8 years). The observers were recruited from the subject panel of the Psychology Department (unit of General and Experimental Psychology /Neuro-Cognitive Psychology). All participants had normal or corrected-to-normal (color) vision and all but one were right-handed.