Developmental trends in right hemispheric participation in reading.

Area of Science:

• Cognitive Neuroscience
• Developmental Psychology
• Neuroscience

Background:

• Cerebral hemisphere processing efficiencies differ between individuals.
• Reading development involves complex cognitive and neural changes.
• Behavioral laterality tasks are used to study brain lateralization.

Purpose of the Study:

• To investigate how cerebral hemisphere processing efficiencies change during reading development.
• To examine the models of hemispheric processing (direct access vs. callosal relay) in children with varying reading experience.
• To understand the dynamic role of the right hemisphere in reading as experience increases.

Main Methods:

• Utilized behavioral laterality tasks, including a lateralized lexical decision task.
• Employed a dual-task paradigm combining oral/silent reading with unimanual finger tapping.
• Compared processing efficiencies between younger and older reading-age children.

Main Results:

• Younger children showed evidence supporting a "direct access" model of hemispheric processing.
• Older children demonstrated a "callosal relay" pattern, suggesting increased interhemispheric communication.
• Right-hand performance was significantly more disrupted than left-hand performance during dual-task finger tapping, indicating right hemisphere involvement.

Conclusions:

• Left hemisphere involvement in reading is stable across development.
• Right hemisphere involvement in reading processing is dynamic and changes with increased reading experience.
• Reading acquisition involves shifts in hemispheric processing strategies.