Language Point 11

This is reasonable, for psychologists use this term to describe mental processes which are unknown to the individual. (Para. 2)
Meaning: The explanation holds water as psychologists use this special term to describe the patterns going on in our mind, which are not known by human beings.
process: n. a connected set of actions or events that produce continuation or slow change
In this example, the conscious mind at the moment of creation knew nothing of the actual processes by which the solution was found.

在这个事例中，意识在创造的时候对发现答案的实际过程一无所知。
Scientists have now discovered more about the processes of sleep and dreaming.

科学家已经发现了更多的有关睡眠和做梦的过程。
Psychologists study the processes by which human personalities are formed, develop and change.

心理学家研究人类性格的形成、发展和改变的过程。