The development of the SNARC effect: evidence for early verbal coding

Area of Science:

• Cognitive Psychology
• Developmental Psychology
• Numerical Cognition

Background:

• The spatial numerical association of response codes (SNARC) effect in adults is influenced by both spatial and verbal magnitude coding.
• A common assumption is that children initially rely on spatial representations (like a mental number line) before developing verbal coding for magnitude.
• This developmental hypothesis regarding numerical cognition has not been empirically tested.

Purpose of the Study:

• To investigate the developmental trajectory of spatial versus verbal coding in explaining the SNARC effect in children.
• To determine when children begin to use verbal recoding of magnitude information.
• To test the hypothesis that spatial coding precedes verbal coding in numerical representation.

Main Methods:

• A magnitude comparison task was administered to 9- and 11-year-old children.
• The study analyzed the SNARC effect to differentiate between spatial and verbal coding contributions.
• Participants' responses were analyzed to infer their underlying numerical representation strategies.

Main Results:

• Both 9- and 11-year-old children exhibited clear and robust evidence of verbal coding for magnitude.
• The SNARC effect in both age groups was significantly explained by verbal coding mechanisms.
• Contrary to prevailing assumptions, spatial coding did not appear to be the primary driver in these age groups.

Conclusions:

• The capacity for verbal coding of numerical magnitude is present and robust early in formal schooling.
• Developmental models of numerical cognition should account for the early emergence of verbal magnitude representation.
• The findings challenge the notion that children's numerical understanding is initially dominated by spatial representations.