November 2002
Volume 2, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   November 2002
Brain activity involved in singleton search mode: an fMRI study
Author Affiliations
  • Toshihide Imaruoka
    Osaka U., Japan
  • Satoru Miyauchi
    Communications Research Lab., Japan
Journal of Vision November 2002, Vol.2, 533. doi:10.1167/2.7.533
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      Toshihide Imaruoka, Satoru Miyauchi; Brain activity involved in singleton search mode: an fMRI study. Journal of Vision 2002;2(7):533. doi: 10.1167/2.7.533.

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Abstract

Visual attention is controlled in two distinct, well-known systems: the top-down selection system and the bottom-up selection system. Though numerous studies have addressed these two selection systems, the difference in neuronal mechanism between them is still unclear. Especially, because the bottom-up selection system normally requires less effort and induces less brain activity than the top-down selection system does, it is difficult to detect the neural mechanism for the bottom-up system compared to that for the top-down system.

In the present study, we used a visual search task, involving two conditions: a feature search condition that would induce top-down selection and a singleton search condition that would induce bottom-up selection, first introduced by Bacon and Egeth (1994). In the first psychological experiment, the task-difficulty and the search-efficiency in each condition were matched to equate the amount of effort required for each condition. Subsequently, we measured brain activity for the two conditions. As a result, in addition to extended activation in frontal and parietal areas: bilateral FEF, bilateral ventral premotor areas, ACC, bilateral parietal areas, and bilateral visual cortices, for both conditions, a direct comparison between the singleton search condition and the feature search condition revealed that the area around the bilateral intraparietal sulci were more involved in the singleton search mode.

Imaruoka, T., Miyauchi, S.(2002). Brain activity involved in singleton search mode: an fMRI study [Abstract]. Journal of Vision, 2( 7): 533, 533a, http://journalofvision.org/2/7/533/, doi:10.1167/2.7.533. [CrossRef]
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