Core Findings - Researchers from University College London identified key brain regions essential for logical thinking and problem-solving, enhancing understanding of human reasoning capabilities [1] Group 1: Research Methodology - The study utilized "lesion-deficit mapping," an effective method for locating brain functions, involving 247 patients with unilateral focal brain damage in the left or right frontal lobes, alongside a control group of 81 healthy individuals [1] Group 2: Testing and Results - Two new tests were developed to assess reasoning abilities: a verbal analogy reasoning task and a non-verbal deductive reasoning task, with results indicating that patients with right frontal lobe damage performed significantly worse, making approximately 15% more errors than other patients and healthy individuals [2] - The study found a close relationship between the right frontal brain network involved in reasoning and the network critical for fluid intelligence, suggesting a shared brain region plays a key role in both reasoning and fluid intelligence [2]