Universität zu Köln

Volberg, G., Chockley, A. S. and Greenlee, M. W. (2017). Do graphemes attract spatial attention in grapheme-color synesthesia? Neuropsychologia, 99. S. 101 - 112. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1873-3514

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Abstract

Grapheme-color synesthetes perceive concurrent colors for some objectively achromatic graphemes (inducers). Using oscillatory responses in the electroencephalogram, we tested the hypothesis that inducers automatically attract spatial attention and, thus, favor a conscious experience of color. Achromatic inducers and real-colored non-inducers were presented to the left or to the right visual hemifield and orientation judgments were required for subsequently presented Gabor patches. The graphemes were irrelevant for the task so that the related brain response was purely stimulus-driven. Synesthetes (n = 12), but not an equal number of controls, showed an early theta power increase for inducers presented to the right compared to the left hemifield, with sources in left fusiform gyrus. Alpha power asymmetries indicative of shifts of spatial attention were not observed. Together, synesthetes showed an increased responsiveness to inducers in grapheme processing areas. However, contrary to our hypothesis, inducers did not attract spatial attention in synesthetes.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Volberg, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chockley, A. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Greenlee, M. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-232487
DOI:	10.1016/j.neuropsychologia.2017.03.004
Journal or Publication Title:	Neuropsychologia
Volume:	99
Page Range:	S. 101 - 112
Date:	2017
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1873-3514
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NEURAL BASIS; EEG ALPHA; POP-OUT; SYNAESTHESIA; OSCILLATIONS; ACTIVATION; INHIBITION; RESOLUTION; TIME; PERFORMANCE Multiple languages Behavioral Sciences; Neurosciences; Psychology, Experimental Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23248