Researchers have found that the ventromedial prefrontal cortex and hippocampus are involved in concept generalization, with some studies suggesting that these brain regions support higher-order learning and creative ideation. The studies indicate that these regions may use map-like representations to organize abstract concepts, with theta oscillations and sleep spindles potentially playing a role in this process. The exact mechanisms and relationships between these brain regions are still being explored, with different studies highlighting various aspects of their interaction.