Connectivity precedes function in the development of the visual word form area.
Level 3 - non-randomized controlled study
Prospective longitudinal observational neuroimaging cohort study (graded by design analogy for non-clinical neuroscience).
PubMed 27500407 · doi:10.1038/nn.4354
What was done
Children were scanned with diffusion and functional MRI longitudinally at age 5 (before learning to read) and again at age 8 (after learning to read) to test whether baseline extrinsic connectivity patterns predict the future functional location of the visual word form area (VWFA).
What was found
The abstract reports no numerical metrics, effect sizes, or p-values. It qualitatively states that functional VWFA responses emerged between age 5 and 8 and that an individual's VWFA location at age 8 was predicted by age 5 connectivity fingerprints, whereas functional responses at age 5 were not predictive.
Why it matters
The study supports the hypothesis that pre-existing anatomical connectivity precedes and scaffolds functional cortical specialization during development.
Limits
The abstract reports no sample size, demographic details, longitudinal retention rate, or statistical metrics of predictive accuracy. As an observational neuroimaging study, direct causal mechanisms cannot be definitively established.
Cited by
- supports In preverbal infants who cannot yet read, the visual word form area already possesses structural and functional connectivity patterns that predispose it to later process written words.