A longitudinal study by Georgetown University shows that extensive training can rewire the brain, shifting activity from the prefrontal cortex to the temporal cortex—a change that may enable true multitasking.
Study Methodology and Key Findings
The study involved participants completing over 30,000 trials of a visual categorization task involving car images over a period of five to ten weeks. Researchers measured brain activity before and after the training period. According to first author Patrick Cox, PhD, prior expertise studies had only examined brains after learning had occurred, whereas this study tracked changes from before to after training.
Initially, the task activated the prefrontal cortex, the brain region responsible for executive function, which typically processes one task at a time. After extensive practice, brain activity shifted to the temporal cortex, which is involved in memory and object recognition. Senior author Maximilian Riesenhuber, PhD, stated that the neural remodeling bypasses what the researchers describe as a "frontal bottleneck," freeing the prefrontal cortex to process other tasks.
The researchers reported that the more the primary car categorization task was offloaded from the prefrontal cortex, the better participants were able to perform a secondary task simultaneously.
Implications
The findings challenge the long-held theory that humans cannot truly multitask and instead only rapidly switch between tasks. The study provides a neural basis for compulsive behaviors, noting that learned behaviors become less accessible to conscious control as they are automated.
The research team noted potential applications for artificial intelligence development, suggesting that the brain's ability to build on prior learning by offloading skills to different regions is a capability that current AI models lack.
Next Steps and Limitations
The research team plans to investigate the signals that facilitate the movement of learning between brain regions and determine the limits of multitasking. They note that tasks relying on overlapping sensory input, such as texting while driving, will never be safe.
Publication Details
The paper, titled "Extensive Experience Remodels Neural Task Circuitry to Escape the Frontal Bottleneck and Increase Automaticity of Categorization," was published on June 4 in the Journal of Cognitive Neuroscience.