Intelligence is generally defined as the ability to solve problems and there are many studies that try to understand and classify it. After observing an important positive correlation in test performance that measured different abilities, Spearman proposed the existence of a general factor (g-factor or fluid intelligence) that would modulate performance in different cognitive tasks. C Different sources of information have associated fluid intelligence with the frontal lobe, one of the areas of the brain with the greatest evolutionary development in humans. In addition to failing fluid intelligence tests, frontal lobe injuries also affect performance on cognitive tests such as flexibility of thought or fluency of speech, which have become known as classical tests of executive functions. Likewise, the frontal lobe has also been associated with fundamental functions for the human being such as the ability to infer feelings in other people, the ability to inhibit our impulses and the ability to keep in mind our long-term goals in order to achieve a goal and with the ability to change perspective. Several years ago, INECO began a collaboration with Professor John Duncan of the Cambridge Cognition and Brain Science Unit in England, trying to determine the relationship between fluid and performance intelligence in various cognitive tests previously associated with the frontal lobe. Currently, the Neuropsychology Research Laboratory is carrying out various studies in different neurological and psychiatric diseases that involve the frontal lobe that try to determine the involvement or not of intelligence in them and its relationship with other cognitive functions. The aforementioned studies are of utmost importance for understanding the functioning of the frontal lobe and its relationship with the intelligence and behavior of individuals since they will help determine if intelligence is directly related to this area of the brain and what it implies. this relationship.