Developmental trajectory of neural specialization for letter and number visual processing

Joonkoo Park, Berry van den Berg, Crystal Chiang, Marty G Woldorff, Elizabeth M Brannon

Research output: Contribution to journalArticleAcademicpeer-review

12 Citations (Scopus)
105 Downloads (Pure)

Abstract

Adult neuroimaging studies have demonstrated dissociable neural activation patterns in the visual cortex in response to letters (Latin alphabet) and numbers (Arabic numerals), which suggest a strong experiential influence of reading and mathematics on the human visual system. Here, developmental trajectories in the event-related potential (ERP) patterns evoked by visual processing of letters, numbers, and false fonts were examined in four different age groups (7-, 10-, 15-year-olds, and young adults). The 15-year-olds and adults showed greater neural sensitivity to letters over numbers in the left visual cortex and the reverse pattern in the right visual cortex, extending previous findings in adults to teenagers. In marked contrast, 7- and 10-year-olds did not show this dissociable neural pattern. Furthermore, the contrast of familiar stimuli (letters or numbers) versus unfamiliar ones (false fonts) showed stark ERP differences between the younger (7- and 10-year-olds) and the older (15-year-olds and adults) participants. These results suggest that both coarse (familiar versus unfamiliar) and fine (letters versus numbers) tuning for letters and numbers continue throughout childhood and early adolescence, demonstrating a profound impact of uniquely human cultural inventions on visual cognition and its development.

Original languageEnglish
Article numbere12578
Number of pages14
JournalDevelopmental Science
Volume23
Issue number3
Early online date5-Jul-2017
DOIs
Publication statusPublished - May-2018

Keywords

  • Journal Article
  • LANGUAGE
  • SYSTEM
  • WORD FORM AREA
  • OCCIPITAL CORTEX
  • CHILDREN LEARN
  • ATTENTION
  • DYNAMICS
  • LATERALIZATION
  • ACTIVATION
  • EXPERTISE

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