Hu C, Yeh S-L, 2004, "Effects of cue informativeness and spatial focus on object-based and space-based selection" Perception 33 ECVP Abstract Supplement
Effects of cue informativeness and spatial focus on object-based and space-based selection
C Hu, S-L Yeh
Goldsmith and Yeari (2003 Journal of Experimental Psychology: Human Perception and Performance 29 897 - 918) obtained object-based effects only under conditions of spread attention, while we found cue informativeness is necessary for object-based selection (Yeh and Lin, 2004 Journal of Vision 4 in press, abstract A38). In this study we further examined which factor, cue informativeness or spatial focus, is critical. The double-rectangle spatial-cueing paradigm was used by manipulating the cue validity (informative/non-informative) and the spread of attention (spread/focusing). When an uninformative peripheral cue was used in a detection task and attention was forced to spread widely, the same-object effect was obtained, along with an inhibitory space-based effect (experiment 1). With an informative peripheral cue and focal attention constrained on fixation, the same-object effect remained, but the space-based effect turned into facilitation (experiment 2). When the target was to be discriminated (square/circle) rather than a simple detection of the square, focusing attention on the fixation prevented the occurrence of the same-object effect, but a facilitatory space-based effect was still obtained (experiment 3). These results suggest that both cue informativeness and spread of attention affect the object-based selection. Dissociation and interdependence of space-based and object-based selection were revealed by differences in task demand (detection vs discrimination) and cue validity.
[Supported by the National Science Council of Taiwan, NSC92-2413-H-002-026 and NSC93-2752-H-002-008-PAE.]
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