Independent and additive repetition priming of motion direction and color in visual search |
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Authors: | Árni Kristjánsson |
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Institution: | 1.Department of Psychology,University of Iceland,Reykjavík,Iceland |
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Abstract: | Priming of visual search for Gabor patch stimuli, varying in color and local drift direction, was investigated. The task relevance
of each feature varied between the different experimental conditions compared. When the target defining dimension was color,
a large effect of color repetition was seen as well as a smaller effect of the repetition of motion direction. The opposite
priming pattern was seen when motion direction defined the target—the effect of motion direction repetition was this time
larger than for color repetition. Finally, when neither was task relevant, and the target defining dimension was the spatial
frequency of the Gabor patch, priming was seen for repetition of both color and motion direction, but the effects were smaller
than in the previous two conditions. These results show that features do not necessarily have to be task relevant for priming
to occur. There is little interaction between priming following repetition of color and motion, these two features show independent
and additive priming effects, most likely reflecting that the two features are processed at separate processing sites in the
nervous system, consistent with previous findings from neuropsychology & neurophysiology. The implications of the findings
for theoretical accounts of priming in visual search are discussed.
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