IntroductionCognitive psychology refers to the scientific investigation of human mental faculties, that is, perception, learning, memorization, reasoning, thinking and understanding. From this vast subject arises the ongoing debate concerning human intelligence. One of the most elusive areas of cognitive psychology, due to the difficulties in defining and measuring it, is nevertheless the most intriguing, as psychologists around the world study it and attempt to deepen our understanding. In recent years, discoveries have highlighted, in hindsight, a rather biased view according to which intelligence is determined solely by genetics or by our environment. According to Eysenck, this is mainly due to larger and better selected samples, as well as technological advances in molecular genetics. To determine the malleability of intelligence, one must first have a clear understanding of what exactly intelligence is. Most definitions reflect the psychometric approach (Gross), which involves measuring differences between individuals using tests. These can be divided into those with a narrower view (Burt and Terman, in Gross), which manifests itself in the idea of ​​general intelligence "g" (Spearman, in Gross), and those with a somewhat broader, which generally attempt to include aspects beyond cognition (Binet and Wechsler, in Gross). At the same time, some define intelligence not as a noun, but as an adjective, that is, intelligent activity (Heim and Ryle, in Gross). This ongoing debate must be taken into account when studying the malleability of intelligence, as IQ scores do not necessarily correspond to actual intelligence, giving some limitations to the benchmarks. Despite these limitations, opponent...... middle of paper...... Harmondsworth, Penguin. In Gross, 2001. Rutter, M. (and the English and Romanian Adopters Study Team (ERA), 1998, Developmental catch-up and deficit following adoption after severe global early deprivation. Journal of Psychology and Psychiatry of the child, 39(4), 465-476 In Gross, 2001Ryle, G., 1949, The Concept of Mind, London, In Gross, 2001. Spearman, C., 1904, General intelligence, objectively determined. and measured, American Journal of Psychology, 15, 201-293 In Gross 2001. Sternberg, RJ, 1998, How Intelligent is Intelligent Testing?, Scientific American Presents: Exploring Intelligence, 9(4), 12-17. ., 1921, In Symposium: Intelligence and its Measurement, Journal of Educational Psychology, 12, 127-133 In Gross, 2001. Wechsler, D., 1944, 3rd edition, The Measurement of Adult Intelligence, Baltimore, Williams. & Wilkins., 2001.