Universität zu Köln

Niessen, Eva ORCID: 0000-0002-2801-0986, Fink, Gereon R. ORCID: 0000-0002-8230-1856, Schweitzer, Lisa, Kluender, Nora and Weiss, Peter H. ORCID: 0000-0002-5230-9080 (2015). Implicit interactions between number and space in digit-color synesthesia. Cortex, 64. S. 225 - 235. PARIS: ELSEVIER MASSON, CORPORATION OFFICE. ISSN 1973-8102

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Abstract

In digit-color synesthesia, a variant of grapheme-color synesthesia, digits trigger an additional color percept. Recent work on number processing in synesthesia suggests that colors can implicitly elicit numerical representations in digit-color synesthetes implying that synesthesia is bidirectional. Furthermore, morphometric investigations revealed structural differences in the parietal cortex of grapheme-color synesthetes, i.e., in the brain region where interactions between number and space occur in non-synesthetic subjects. Based upon these previous findings, we here examined whether implicitly evoked numerical representations interact with spatial representations in synesthesia in such a way that even a non-numerical, visuo-spatial task (here: line bisection) is modulated, i.e., whether synesthetes exhibit a systematic bisection bias for colored lines. Thirteen digit-color synesthetes were asked to bisect two sets of lines which were colored in their individual synesthetic colors associated with a small or a large digit, respectively. For all colored line stimuli combined, digit-color synesthetes showed - like control subjects (n = 13, matched for age, gender, IQ and handedness) - a pseudo-neglect when bisecting colored lines. Measuring the color-induced change of the bisection bias (i.e., comparing the biases when bisecting lines colored according to a small number us those lines corresponding to a large number) revealed that only digit-color synesthetes were significantly influenced by line color. The results provide further evidence for the bidirectional nature of synesthesia and support the concept of a mental number line. In addition, they extend previous reports on bidirectionality in synesthesia by showing that even non-numerical, visuo-spatial performance can be modulated by implicit bidirectional processes. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Niessen, Eva UNSPECIFIED orcid.org/0000-0002-2801-0986 UNSPECIFIED Fink, Gereon R. UNSPECIFIED orcid.org/0000-0002-8230-1856 UNSPECIFIED Schweitzer, Lisa UNSPECIFIED UNSPECIFIED UNSPECIFIED Kluender, Nora UNSPECIFIED UNSPECIFIED UNSPECIFIED Weiss, Peter H. UNSPECIFIED orcid.org/0000-0002-5230-9080 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-406734
DOI:	10.1016/j.cortex.2014.11.001
Journal or Publication Title:	Cortex
Volume:	64
Page Range:	S. 225 - 235
Date:	2015
Publisher:	ELSEVIER MASSON, CORPORATION OFFICE
Place of Publication:	PARIS
ISSN:	1973-8102
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LINE BISECTION JUDGMENTS; RIGHT PARIETAL CORTEX; BIDIRECTIONAL SYNESTHESIA; NEURONAL CORRELATE; NEURAL BASIS; HUMAN BRAIN; SYNAESTHESIA; MAGNITUDE; FMRI; REPRESENTATIONS Multiple languages Behavioral Sciences; Neurosciences; Psychology, Experimental Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/40673