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A longitudinal study of grapheme-color synesthesia in childhood

Date:
November 12, 2013
Source:
Frontiers
Summary:
In the first long-term study on grapheme-color synesthesia, researchers followed 80 children, including 8 synesthetes, to determine when and how associations between graphemes and colors develop.
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Colored letters.
Credit: © AntonioBattista Am2 / Fotolia

What colour is H? Is 4 brighter than 9? For most people these questions might seem baffling, but not for people with grapheme-color synesthesia.

In the first long-term childhood study on grapheme-color synesthesia, researchers followed 80 children to determine when and how associations between graphemes and colors develop. The latest results are published in the open-access journal Frontiers in Human Neuroscience.

Grapheme-color synesthesia is a harmless, alternative form of perception caused by subtle differences in the brain -- possibly, stronger connections between centers for language and color -- that give letters and numbers their phantom colors. It is passed down from parent to child in around 1 to 2% of the population.

In the present study, a group of synesthete children was tested three times between 6 and 10 years old. Each child was presented with 36 graphemes -- the letters A to Z and digits 0 to 9 -- and asked to choose the 'best' of 13 colors for each.

Children with grapheme-color synesthesia had already developed strong associations for around 30% of graphemes at 6 years old. At 7 years old, the same children had associations for around 50% of graphemes, and this increased to 70% of graphemes at 10 years old. The synesthete children were consistent in their choices over this 4-year period. Three children who were synesthetes at ages 6 to 7 were no longer so at 10 years old, indicating that the condition spontaneously disappears in some children as they grow older.

"This repeated testing of child synesthetes in real time allowed us to see for the first time that synesthetic colours emerge slowly during childhood, building up an incremental inventory of colorful letters and numbers," says Dr. Simner, a cognitive neuropsychologist who specializes in synesthesia, from the University of Edinburgh, UK.

The researchers' next challenge is to determine how changes in the intensity of synesthesia -- as strengthening or loss with increasing age -- can be explained from changes in the organization of the brain.


Story Source:

The above story is based on materials provided by Frontiers. Note: Materials may be edited for content and length.


Journal Reference:

  1. Julia Simner and Angela E. Bain. A longitudinal study of grapheme-colour synaesthesia in childhood: 6/7 years to 10/11 years. Frontiers in Psychology, 2013 DOI: 10.3389/fnhum.2013.00603

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Frontiers. "A longitudinal study of grapheme-color synesthesia in childhood." ScienceDaily. ScienceDaily, 12 November 2013. <www.sciencedaily.com/releases/2013/11/131112105028.htm>.
Frontiers. (2013, November 12). A longitudinal study of grapheme-color synesthesia in childhood. ScienceDaily. Retrieved May 26, 2015 from www.sciencedaily.com/releases/2013/11/131112105028.htm
Frontiers. "A longitudinal study of grapheme-color synesthesia in childhood." ScienceDaily. www.sciencedaily.com/releases/2013/11/131112105028.htm (accessed May 26, 2015).

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