(Piaget)concluded that intellectual development is the result of the interaction of hereditary andenvironmental factors. As the child develops and constantly interacts with the world around him, knowledge is invented and reinvented. His theory ofintellectual development is strongly grounded in the biological sciences. He saw cognitive growth as an extension of biological growth and asbeing governed by the same laws and principles. Piagetarguedthat intellectual development controlled every other aspect of development - emotional,social, and moral.
this phenomenon arises in some drug categories, such as theopiates (heroin, morphine etc) and tryptamines (LSD,mescaline and psilocybin) when the prolonged use of one drugin the group results in the development of tolerance to theothers opioids.