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When intelligence loses its impact: neural efficiency during reasoning in a familiar area
Roland H Grabner1, Elsbeth Stern, Aljoscha C Neubauer
1Department of Psychology, University of Graz, Universitätsplatz 2, A-8010 Graz, Austria.
Summary
Higher intelligence correlates with less brain activity during cognitive tasks, suggesting neural efficiency. However, extensive experience can equalize cortical activation between individuals with different IQs, even for complex tasks.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neuroimaging
Background:
- Previous research indicates a negative correlation between intelligence and cortical activity during cognitive tasks.
- This phenomenon is often explained by the neural efficiency hypothesis, where higher intelligence requires fewer neural resources.
- Individual differences in cognitive abilities and their neural underpinnings are a key area of research.
Purpose of the Study:
- To investigate the relationship between intelligence (IQ) and cortical activation in experienced individuals.
- To explore whether long-term experience can modulate the neural efficiency observed in intelligence-related tasks.
- To examine cortical activation patterns during both familiar and novel cognitive tasks.
Main Methods:
- Utilized electroencephalogram (EEG) to measure event-related desynchronization (ERD) as an indicator of cortical activation.
- Recruited 31 experienced taxi drivers with varying IQs, assessed using Raven's advanced progressive matrices test.
- Assigned participants to perform a familiar task (navigating known city routes) and a novel task (memorizing artificial map routes).
Main Results:
- A median split of participants based on IQ revealed that individuals with lower IQs exhibited higher cortical activation during the novel task compared to those with higher IQs.
- No significant difference in cortical activation was observed between lower and higher IQ groups during the familiar task.
- This suggests that task familiarity and long-term experience play a crucial role in modulating neural activity.
Conclusions:
- Long-term experience can compensate for differences in intellectual ability at the level of cortical activation.
- The neural efficiency hypothesis may not fully apply when individuals possess extensive experience in a task domain.
- Findings highlight the interplay between innate cognitive abilities and acquired expertise in shaping brain function.