The human brain is a material organ that produces consciousness, but the content of consciousness comes from the objective world. The most important function of the conscious brain area is to identify authenticity, that is, it can identify whether the representation in its own brain area comes from external senses or from imagination or memory. No other brain region has this ability to distinguish authenticity.

When a person is sleeping, the excitement of the conscious brain area is reduced to a minimum. At this time, it is impossible to distinguish the authenticity of the images in the brain, and the brain then adopts all methods of believing it to be true. This is the so-called "dream" . The conscious brain area does not have its own memory. Its storage area is called the "temporary storage area". Just like the memory of a computer, it can only temporarily store the perceived information. Extended information

From simple organic biochemical processes to complex brain biochemical processes, as life evolves, this process eventually evolves from spontaneous natural behaviors to conscious human and animal behaviors.

Thoughts are generated on the basis of consciousness. Our perceptual ability helps us remember. After memory and analysis, thoughts are generated. Animals also have thoughts. Their thoughts are not spontaneous, but also have subjective initiative. Only human thoughts are conscious and colorful.

Consciousness is divided into various forms in human practice, including memory, thoughts, emotions, ideas, concepts, etc. From the intuition of appearance to the collection of ideas of certain phenomena, it finally develops logically into concepts, and finally forms thoughts through thinking.

Baidu Encyclopedia-Consciousness