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Umemoto, A., Drew, T., Ester, E.F. & Awh, E. A bilateral advantage for storage in visual working memory.
Factor analysis by ANOVA confirmed this main effect of display mode, and also revealed several higher order interactions with display geometry, indicating that the bilateral advantage was masked at certain target positions by a crowding-like effect.
Averaging performance across all conditions save display mode (bilateral vs. unilateral) revealed a significant bilateral advantage in the form of a 21% increase in apparent item scanning speed for target detection; in the absence of a target, bilateral displays gave a 5% increase in speed that was not significant.
The bilateral advantage observed in Experiment 1 for numerosities greater than four seems to reflect an advantage of dividing attention between the left and right hemifields as compared to within the same hemifield, as greater numerosities may require greater attention.
In particular, retinal stimulation in the bilateral condition may differ from that in the unilateral condition and that could potentially account for the bilateral advantage observed in Experiment 1.
However, if such a bilateral advantage is a general feature of selective attention, as previous findings seem to suggest [12] [15], we may predict a bilateral field advantage in visual enumeration only when the task requires a certain amount of attentional resources.
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Therefore, the possibility that the bilateral field advantage in visual enumeration actually reflects a horizontal advantage in number processing remains.
The search task of Luck, Hillyard, Mangun and Gazzaniga (1989) was optimised to test for the presence of a bilateral field advantage in the visual search capabilities of normal subjects.
Thus, the bilateral field advantage observed in Experiment 1 cannot be explained by the horizontal alignment of the dots.
These results suggest that a bilateral field advantage can arise when the visual task involves inter-hemispheric integration.
This bilateral field advantage was observed when more than four objects had to be enumerated, suggesting that this bilateral effect occurs when sufficient attentional resources are requisite.
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