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@ARTICLE{Niessen:185616,
      author       = {Niessen, Eva and Fink, G. R. and Schweitzer, L. and
                      Kluender, N. and Weiss-Blankenhorn, Peter},
      title        = {{I}mplicit interactions between number and space
                      indigit-color synesthesia.},
      journal      = {Cortex},
      volume       = {64},
      issn         = {0010-9452},
      address      = {Paris},
      publisher    = {Elsevier Masson},
      reportid     = {FZJ-2014-07042},
      pages        = {225 – 234},
      year         = {2015},
      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 vs 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.},
      cin          = {INM-3},
      ddc          = {570},
      cid          = {I:(DE-Juel1)INM-3-20090406},
      pnm          = {572 - (Dys-)function and Plasticity (POF3-572)},
      pid          = {G:(DE-HGF)POF3-572},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000351248400021},
      pubmed       = {pmid:25498947},
      doi          = {10.1016/j.cortex.2014.11.001},
      url          = {https://juser.fz-juelich.de/record/185616},
}