Abstract: . . .  differences in the results, this can only be due to the difference in Page 29 Within and cross dimensions 29 response demands. The results showed a clear difference between the two tasks: the cross- dimensional cost and the intertrial effects were present in the detection non-search task, but were absent in the compound non-search task (see also Theeuwes, Reimann & Mortier, in press). These data are crucial for the localization of these effects. These findings show that these effects do not occur at the perceptual level, but rather at the response selection stage. One might argue that there was no need to actually process the surrounding stimulus in the compound non-search task. Participants had to respond to a line segment presented inside a single . . .
. . .  experimental psychology Page 1 Within and cross dimensions 1 Running Head: WITHIN AND CROSS DIMENSIONS Response Selection modulates Visual Search Within And Across Dimensions. In press Journal of Experimental Psychology : Human Perception and Performance. Karen Mortier Jan Theeuwes Peter Starreveld Vrije Universiteit Amsterdam The Netherlands Address for correspondence: Karen Mortier Department of Cognitive Psychology , Vrije Universiteit Van der Boechorststraat 1 1081 BT Amsterdam The Netherlands Email: k.mortier@psy.vu.nl Page 2 Within and cross dimensions . . .
. . .  compound non-search task. Both tasks had two conditions, a within-dimensional condition and a cross-dimensional condition (see Experiment 1 and 2), which was presented in counterbalanced order. Participants received 50 practice trials before each condition. Each condition comprised 9 experimental blocks, with each block consisting of 40 trials. This resulted in a total of 720 experimental trials. In the detection task, for each condition, there were 180 target-present trials Page 27 Within and cross dimensions 27 and 180 target-absent trials. On the target-present trials, each of the three targets was presented equally often. Within each condition, all types of trials were randomly varied. In the compound task, in each condition, there were 180 . . .
. . .  experimental psychology Page 1 Within and cross dimensions 1 Running Head: WITHIN AND CROSS DIMENSIONS Response Selection modulates Visual Search Within And Across Dimensions. In press Journal of Experimental Psychology : Human Perception and Performance. Karen Mortier Jan Theeuwes Peter Starreveld Vrije Universiteit Amsterdam The Netherlands Address for correspondence: Karen Mortier Department of Cognitive Psychology , Vrije Universiteit Van der Boechorststraat 1 1081 BT Amsterdam The Netherlands Email: k.mortier@psy.vu.nl Page 2 Within and cross dimensions 2 Abstract In feature search tasks, . . .
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