Universität zu Köln

Chen, Siyi, Weidner, Ralph ORCID: 0000-0002-4502-0166, Zeng, Hang, Fink, Gereon R. ORCID: 0000-0002-8230-1856, Mueller, Hermann J. and Conci, Markus (2021). Feedback from lateral occipital cortex to V1/V2 triggers object completion: Evidence from functional magnetic resonance imaging and dynamic causal modeling. Hum. Brain Mapp., 42 (17). S. 5581 - 5595. HOBOKEN: WILEY. ISSN 1097-0193

Full text not available from this repository.

Abstract

Illusory figures demonstrate the visual system's ability to integrate disparate parts into coherent wholes. We probed this object integration process by either presenting an integrated diamond shape or a comparable ungrouped configuration that did not render a complete object. Two tasks were used that either required localization of a target dot (relative to the presented configuration) or discrimination of the dot's luminance. The results showed that only when the configuration was task relevant (in the localization task), performance benefited from the presentation of an integrated object. Concurrent functional magnetic resonance imaging was performed and analyzed using dynamic causal modeling to investigate the (causal) relationship between regions that are associated with illusory figure completion. We found object-specific feedback connections between the lateral occipital cortex (LOC) and early visual cortex (V1/V2). These modulatory connections persisted across task demands and hemispheres. Our results thus provide direct evidence that interactions between mid-level and early visual processing regions engage in illusory figure perception. These data suggest that LOC first integrates inputs from multiple neurons in lower-level cortices, generating a global shape representation while more fine-graded object details are then determined via feedback to early visual areas, independently of the current task demands.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Chen, Siyi UNSPECIFIED UNSPECIFIED UNSPECIFIED Weidner, Ralph UNSPECIFIED orcid.org/0000-0002-4502-0166 UNSPECIFIED Zeng, Hang UNSPECIFIED UNSPECIFIED UNSPECIFIED Fink, Gereon R. UNSPECIFIED orcid.org/0000-0002-8230-1856 UNSPECIFIED Mueller, Hermann J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Conci, Markus UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-591294
DOI:	10.1002/hbm.25637
Journal or Publication Title:	Hum. Brain Mapp.
Volume:	42
Number:	17
Page Range:	S. 5581 - 5595
Date:	2021
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1097-0193
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LINE BISECTION JUDGMENTS; MULLER-LYER-ILLUSION; HUMAN VISUAL-CORTEX; ILLUSORY CONTOURS; PERCEPTION; BRAIN; SHAPE; FMRI; ACTIVATION; ATTENTION Multiple languages Neurosciences; Neuroimaging; Radiology, Nuclear Medicine & Medical Imaging Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59129