Cognition includes feeling, perception, memory, thinking, imagination and language.

Specifically, the process of acquiring or applying knowledge begins with feeling and perception. Feeling is the understanding of individual attributes and characteristics of things, such as feeling color, light and shade, tone, smell, thickness, soft and hard, etc. Perception is the understanding of the whole thing and its relationship, such as seeing a red flag, hearing a noisy voice, touching a soft sweater, etc.

The knowledge and experience acquired by people through sense perception does not disappear immediately after the stimulus stops acting. It remains in people’s mind and can be reproduced when necessary. This psychological process of accumulating and preserving individual experience is called memory.

Human beings can not only directly perceive individual and specific things, but also understand the superficial relations and relations of things, but also use the knowledge and experience in mind to indirectly and generally understand things, reveal the essence of things and their internal relations and laws, form the concept of things, carry out reasoning and judgment, and solve various problems faced. This is thinking.

People can also use language to communicate with others the results of their thinking activities and cognitive activities, and accept other people’s experience, which is called language activities.

People also have imaginative activities, which are carried out by means of specific images preserved in their minds.