The stimulation they were referring to was a parents own passing of knowledge and siblings. Depending on how much each family member contributes to the learning of the child usually determines how smart they will become. The theory is that the first child receives all the attention from parents and so he is usually the smartest. A second child though, would retain knowledge passed on by his parents and his older sibling, and depending on how old the sibling was would determine how much knowledge the second child would receive. If the first born was of an older age, the second born would be able to receive much more knowledge, but at the cost of the older sibling leaving the home at an earlier date, thereby ending how much knowledge could be passed. After a long line of children though the intelligence begins to rise again and even increase past the first. This is due
The stimulation they were referring to was a parents own passing of knowledge and siblings. Depending on how much each family member contributes to the learning of the child usually determines how smart they will become. The theory is that the first child receives all the attention from parents and so he is usually the smartest. A second child though, would retain knowledge passed on by his parents and his older sibling, and depending on how old the sibling was would determine how much knowledge the second child would receive. If the first born was of an older age, the second born would be able to receive much more knowledge, but at the cost of the older sibling leaving the home at an earlier date, thereby ending how much knowledge could be passed. After a long line of children though the intelligence begins to rise again and even increase past the first. This is due