Molecular link between intelligence and curiosity discovered
Published on September 17, 2009 at 12:51 AM
Scientists from the Samuel Lunenfeld Research Institute of Mount Sinai Hospital in Toronto have discovered a molecular link between intelligence and curiosity, which may lead to the development of drugs to improve learning.
In a paper, published in Neuron, Dr. John Roder, Senior Investigator at the Lunenfeld, and Bechara Saab, Ph.D candidate at the Lunenfeld, studied the interaction of two proteins in a small region of the brain called the dentate gyrus (part of the hippocampus, which plays a role in long-term memory and spatial navigation).
For the study, the neuronal calcium sensor-1 (NCS-1), a protein which is known to affect the memory of worms and is linked to bipolar and schizophrenia in people, was increased by one-and-a-half fold specifically in the dentate gyrus of mouse models. This modest overexpression increased the ability of brain cells to change how they communicate with each other and gave the mice superior memory in complex tasks and a significant increase in exploratory behaviour (curiosity). Because the exploratory behaviour was only altered in safe environments, Dr. Roder and Saab believe they have discovered a region of the brain that generates curiosity and a model for how brain activity leads to curiosity.
The researchers also discovered that both curiosity and spatial memory were impaired when a benign drug blocked the NCS-1 protein from binding to the dopamine type-2 receptors (a major target of anti-psychotics) in the dentate gyrus.
"Now that we know that some of the molecules and brain regions that control learning and memory also control curiosity, we can go back to the lab and design drugs that may improve cognition in humans - that's the potential benefit for the future," explains Saab. "Immediately, however, we can put into use the knowledge that fostering curiosity should also foster intelligence and vice versa."