Age-related changes in regional brain activation during phonological decoding and printed word recognition
P G Simos1, J I Breier, J M Fletcher
1Vivian L. Smith Center for Neurologic Research, Department of Neurosurgery, The University of Texas-Houston Medical School, 77030, USA. psimos@uth.tmc.edu
Developmental Neuropsychology
|September 4, 2001
Summary
Brain activation during reading changes with age. Adults show distinct patterns in occipital, temporal, and frontal regions, while children exhibit less specialized activation, suggesting developmental changes in reading networks.
Area of Science:
- Neuroscience
- Cognitive Science
- Developmental Psychology
Background:
- Reading is a complex cognitive process involving multiple brain regions.
- Understanding age-related changes in brain activation during reading is crucial for identifying developmental trajectories and potential reading difficulties.
- Previous research has identified key brain areas involved in reading, but the developmental trajectory of their activation patterns is less understood.
Purpose of the Study:
- To investigate age-related differences in spatiotemporal brain activation profiles during printed word recognition and phonological decoding.
- To compare brain activation patterns in children and adults without reading problems.
- To elucidate how the specialization of cortical regions and their interactions evolve with age during reading.
Main Methods:
- Magnetic Source Imaging (MSI) was employed to examine brain activity.
- The study included 27 adults and 22 children with no history of reading problems.
- Participants performed tasks involving printed word recognition and phonological decoding (pseudoword reading).
Main Results:
- Adults demonstrated a distinct temporal sequence of activation: occipital, followed by left-predominant basal temporal, and finally left temporoparietal and inferior frontal regions.
- Children showed less temporal distinction between basal and temporoparietal activation.
- Children exhibited weaker left inferior frontal gyrus activation and lacked the consistent hemispheric asymmetry in basal temporal activation observed in adults.
Conclusions:
- The degree of cortical specialization for reading and the pattern of regional interactions change with age.
- Developmental changes in reading networks involve shifts in the timing and lateralization of brain activation.
- These findings provide insights into the neural basis of reading development and maturation.
