DYNAMICS OF ATTENTIONAL SHIFTS WITH HIERARCHICAL STIMULI

  • Priyanka Srivastava
  • Narayanan Srinivasan

Abstract

Visual attention enables selection of a particular perceptual level (global or local) and shiftbetween levels for processing information. An experiment was conducted using the attentionaldwell time paradigm to investigate the shifts of visual attention between objects at differentlevels. Participants were instructed to identify two successive compound stimuli at a prespecifiedlevel (global or local) presented at two different locations with variable SOA.Results showed very little impairment for second target identification when both the targetswere at the global level. Attentional shift was better with both the targets at the same levelcompared to the different levels. The results indicate that global processing could beperformed with very little capacity limitation throughout the visual field with distributedattention. The results also suggest that different mechanisms underlie shifts in attentionbetween different locations and changes in attentional set required by changes in perceptuallevels.
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