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Acta Psychologica Sinica    2013, Vol. 45 Issue (2) : 139-148     DOI: 10.3724/SP.J.1041.2013.00139
Working Memory Representation Does Guide Visual Attention: Evidence from Eye Movements
(1 School of Education / The Center for Mind and Brain, Guangzhou University, Guangzhou 510006, China) (2 School of Psychology, South China Normal University, Guangzhou 510631, China)
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Abstract  Whether the working memory representations could guide visual attention to select the matching stimuli in visual search is still controversial. By requiring the participants to perform a visual search task while online keeping some objects in working memory, some researchers have observed a stronger interference from the distractor when it was identical or related to the object held in memory. But other researchers did not observe such attentional guidance effect even using similar procedures. Olivers (2009) examined several possible influencing factors through a series of experiments and finally attributed the discrepancy to the search type whether the search target was varied or not across trials throughout the experiment. However, according to our analysis, there were several factors might confound the results in the critical experiment of Olivers (2009). So here, we used the classic dual task combined with eye movement tracking technology to reexamine and evaluate the effect of the search type on the top-down guiding process of visual attention from working memory representations. Experiment 1 aimed to reexamine the effect of search type on attentional guidance via counterbalancing the perceptual difficulty of the search array in two types of the visual search task. The experimental procedure was similar to that used in the Experiment 5 of Olivers (2009) except making the perceptual difficulty of search array to be equal between visual search tasks. The eye movement data showed that, both in fixed- and varied-target visual search task, the distractor which was identical to the working memory representation was more easily to capture visual attention than the control distractor which was irrelevant to the working memory representations. It is suggested that the attentional guidance would appear no matter which visual search type used. However, we also found that the magnitude of attentional guidance was greater in the fixed-target visual search task than in the varied-target visual search task. Experiment 2 aimed to examine whether search type or working memory load was the real fact which caused the difference of guidance effect between visual search tasks in experiment 1. In the present experiment, we counterbalanced the working memory load between two types of visual search task. Consistent to experiment 1, the results also showed significant attentional guidance in both visual search task, however, the magnitude of the attentional guidance between visual search tasks became equivalent. In conclusion, these results disobeyed the explanation that the visual search type was the determinant factor for whether the attentional guidance has been observed or not in the previous studies, and suggested that the attentional guidance from working memory was to some degree affected by the factors of working memory load.
Keywords working memory representation      attentional guidance      working memory load      visual search type     
Corresponding Authors: ZHANG Bao   
Issue Date: 28 February 2013
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ZHANG Bao;HUANG Sai;QI Lu. Working Memory Representation Does Guide Visual Attention: Evidence from Eye Movements[J]. Acta Psychologica Sinica,2013, 45(2): 139-148.
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