TY  - JOUR
PY  - 2019//
TI  - Differential brain mechanisms for processing distracting information in task-relevant and -irrelevant dimensions in visual search
JO  - Human brain mapping
A1  - Wei, Ping
A1  - Yu, Hongbo
A1  - Müller, Hermann J.
A1  - Pollmann, Stefan
A1  - Zhou, Xiaolin
SP  - 110
EP  - 124
VL  - 40
IS  - 1
N2  - A crucial function of our goal-directed behavior is to select task-relevant targets among distractor stimuli, some of which may share properties with the target and thus compete for attentional selection. Here, by applying functional magnetic resonance imaging (fMRI) to a visual search task in which a target was embedded in an array of distractors that were homogeneous or heterogeneous along the task-relevant (orientation or form) and/or task-irrelevant (color) dimensions, we demonstrate that for both (orientation) feature search and (form) conjunction search, the fusiform gyrus is involved in processing the task-irrelevant color information, while the bilateral frontal eye fields (FEF), the cortex along the left intraparietal sulcus (IPS), and the left junction of intraparietal and transverse occipital sulci (IPTO) are involved in processing task-relevant distracting information, especially for target-absent trials. Moreover, in conjunction (but not in feature) search, activity in these frontoparietal regions is affected by stimulus heterogeneity along the task-irrelevant dimension: heterogeneity of the task-irrelevant information increases the activity in these regions only when the task-relevant information is homogeneous, not when it is heterogeneous. These findings suggest that differential neural mechanisms are involved in processing task-relevant and task-irrelevant dimensions of the searched-for objects. In addition, they show that the top-down task set plays a dominant role in determining whether or not task-irrelevant information can affect the processing of the task-relevant dimension in the frontoparietal regions.<br><br>© 2018 Wiley Periodicals, Inc.<p />  <p>Language: en</p>
LA  - en
SN  - 1065-9471
UR  - http://dx.doi.org/10.1002/hbm.24358
ID  - ref1
ER  -