When we learn a new task we change both the structure and function of the neurons in our brains. Faced with a new challenge, neurons increase production of the chemical transmitters that convey signals from one neuron to another.
Repetitive activity stimulates the development of numerous new connections among the billions of neurons in our brains. Repetitive use of the new skill strengthens the new network. Less used mental pathways fade away. This process of gain and loss continues throughout our lives so long as we choose physically and mentally active lifestyles.
Memory is a two-step process in which fresh information is first assembled at a relay station in the brain before being transmitted to a more permanent repository. This process is impaired if the brain is bombarded with fleeting input.
In my school days we wrote, read, solved problems at blackboards and in labs, and memorized spelling as well as poetry and dramatic speeches. Even today I can recite various passages from literary masters such as Edgar Allan Poe and William Shakespeare. While more intense, college maintained the same pattern for increasing our stores of information. We took more extensive notes. We spent hours in libraries, retrieving journals and books for research papers.
The Internet has dramatically changed this pattern of learning.