Background: Right posterior parietal cortex (rPPC) and frontal eye fields (FEF) are known to be involved in processing visuospatial attention. However, the functional involvement of these areas in spatial priming in complex conjunction visual search has yet to be determined. Objective: This study aimed to examine the roles of rPPC and bilateral FEF in conjunction search when spatial ambiguity was reduced by priming the target location. Methods: Participants completed a conjunction search task whereby the target location was random or else repeated from the previous trial. Transcranial magnetic stimulation was delivered to each one of the three sites of interest at a time, and task performance was compared with a sham condition. Results: Spatial priming occurred for all conditions: search times were faster for primed relative to nonprimed trials. When the target appeared at a nonprimed location, stimulation over any of the three sites increased reaction times relative to the sham condition. However, when the target location was repeated, reaction time was only significantly increased by stimulation over the right FEF. Conclusions: rPPC and left FEF are only involved when the target location is random, suggesting that these areas are essential for resolving spatial ambiguity to localize targets. Conversely, right FEF contributes equally to visual search regardless of spatial priming. We propose that right FEF has a role in the integration of bottom up saliency and top down expectancy signals and is the node at which rPPC and/or left FEF is either recruited or not.
Lane, A., Smith, D., Schenk, T., & Ellison, A. (2012). The involvement of posterior parietal cortex and frontal eye fields in spatially primed visual search. Brain Stimulation, 5(1), 11-17. https://doi.org/10.1016/j.brs.2011.01.005
Animal replacement technique, Attention, Transcranial magnetic stimulation, Visuospatial cognition.
Accepted Journal Article
NOTICE: this is the author’s version of a work that was accepted for publication in Brain stimulation. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Brain stimulation, 5/1, January 2012, 10.1016/j.brs.2011.01.005.