Abstract
Can spatial frequency differences between local and global forms account for differences in the way different levels of structure are analyzed? We examined this question by having subjects identify local or global forms of hierarchical stimuli that had beencontrast balanced. Contrast balancing eliminates low spatial frequencies, so that both local and global forms must be identified on the basis of high spatial frequency information. Response times (RTs) to global (but not local) forms were slowed for contrast-balanced stimuli, suggesting that low spatial frequencies mediate the global RT advantage typically found. In contrast, interference between local and global forms was little affected by contrast balancing or by shifts of attention between local and global forms, suggesting that it does not result from inhibitory interactions between spatial frequency channels or from temporal precedence of low versus high spatial frequency information. Finally, shifts of attention between local and global forms were also little affected by contrast balancing, suggesting that they were not based on spatial frequency.
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This research was supported by the Medical Research Council of the Veterans Administration and by National Institute of Neurological Disorders and Stroke Grant NS27902 to M. R. L.
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Lamb, M.R., Yund, E.W. The role of spatial frequency in the processing of hierarchically organized stimuli. Perception & Psychophysics 54, 773–784 (1993). https://doi.org/10.3758/BF03211802
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DOI: https://doi.org/10.3758/BF03211802