| Abstract: | Ss judged whether 2 successive line segments had the same orientation. The pairs were lateralized, and the location on the screen and the distance between the segments in a pair were varied. When stimuli were relatively close to the center of the screen, Ss evaluated segments that were relatively far apart more quickly when they were presented in the left visual field and tended to judge segments that were close together more quickly when they were presented in the right visual field. In contrast, when the line segments were moved into the periphery, the previous pattern of results was reversed. In addition, results in a second block of trials depended on how attention had been set in the 1st set of trials. The observed hemispheric differences were due to attentional effects, not stable physiological properties of the brain. Previously observed hemispheric differences in spatial frequency analysis could reflect attentional biases. (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
