Universität zu Köln

Corradi-Dell'Acqua, Corrado ORCID: 0000-0002-7512-9023, Fink, Gereon R. ORCID: 0000-0002-8230-1856 and Weidner, Ralph ORCID: 0000-0002-4502-0166 (2015). Selecting category specific visual information: Top-down and bottom-up control of object based attention. Conscious. Cogn., 35. S. 330 - 342. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1090-2376

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Abstract

The ability to select, within the complexity of sensory input, the information most relevant for our purposes is influenced by both internal settings (i.e., top-down control) and salient features of external stimuli (i.e., bottom-up control). We here investigated using fMRI the neural underpinning of the interaction of top-down and bottom-up processes, as well as their effects on extrastriate areas processing visual stimuli in a category-selective fashion. We presented photos of bodies or buildings embedded into frequency-matched visual noise to the subjects. Stimulus saliency changed gradually due to an altered degree to which photos stood-out in relation to the surrounding noise (hence generating stronger bottom-up control signals). Top-down settings were manipulated via instruction: participants were asked to attend one stimulus category (i.e., is there a body? or is there a building?). Highly salient stimuli that were inconsistent with participants' attentional top-down template activated the inferior frontal junction and dorsal parietal regions bilaterally. Stimuli consistent with participants' current attentional set additionally activated insular cortex and the parietal operculum. Furthermore, the extrastriate body area (EBA) exhibited increased neural activity when attention was directed to bodies. However, the latter effect was found only when stimuli were presented at intermediate saliency levels, thus suggesting a top-down modulation of this region only in the presence of weak bottom-up signals. Taken together, our results highlight the role of the inferior frontal junction and posterior parietal regions in integrating bottom-up and top-down attentional control signals. (C) 2015 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Corradi-Dell'Acqua, Corrado UNSPECIFIED orcid.org/0000-0002-7512-9023 UNSPECIFIED Fink, Gereon R. UNSPECIFIED orcid.org/0000-0002-8230-1856 UNSPECIFIED Weidner, Ralph UNSPECIFIED orcid.org/0000-0002-4502-0166 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-395296
DOI:	10.1016/j.concog.2015.02.006
Journal or Publication Title:	Conscious. Cogn.
Volume:	35
Page Range:	S. 330 - 342
Date:	2015
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication:	SAN DIEGO
ISSN:	1090-2376
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EXTRASTRIATE BODY AREA; PREFRONTAL CORTEX; STROOP TASK; MODULATION; VOLUNTARY; CONFLICT; IMAGES; SIGNAL; BRAIN Multiple languages Psychology, Experimental Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39529