A body-centred frame of reference drives spatial priming in visual search |
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Authors: | Keira Ball Daniel Smith Amanda Ellison Thomas Schenk |
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Institution: | (1) Department of Psychology, Durham University, Durham, UK;(2) Cognitive Neuroscience Research Unit, Wolfson Research Institute, Durham University, Queen’s Campus, University Boulevard, Stockton on Tees, TS17 6BH Durham, UK |
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Abstract: | Spatial priming in visual search is a well-documented phenomenon. If the target of a visual search is presented at the same
location in subsequent trials, the time taken to find the target at this repeated target location is significantly reduced.
Previous studies did not determine which spatial reference frame is used to code the location. At least two reference frames
can be distinguished: an observer-related frame of reference (egocentric) or a scene-based frame of reference (allocentric).
While past studies suggest that an allocentric reference frame is more effective, we found that an egocentric reference frame
is at least as effective as an allocentric one (Ball et al. Neuropsychologia
47(6):1585–1591, 2009). Our previous study did not identify which specific egocentric reference frame was used for the priming: participants could
have used a retinotopic or a body-centred frame of reference. Here, we disentangled the retinotopic and body-centred reference
frames. In the retinotopic condition, the position of the target stimulus, when repeated, changed with the fixation position,
whereas in the body-centred condition, the position of the target stimulus remained the same relative to the display, and
thus to the body-midline, but was different relative to the fixation position. We used a conjunction search task to assess
the generality of our previous findings. We found that participants relied on body-centred information and not retinotopic
cues. Thus, we provide further evidence that egocentric information, and specifically body-centred information, can persist
for several seconds, and that these effects are not specific to either a feature or a conjunction search paradigm. |
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