The universe is a material world that is constantly moving and changing. As one of the members of this material world, we humans are just an insignificant part. Can this world still be immaterial? Even if someone says that our world exists in a person's mind, then this person's brain cannot escape the existence of material form. Just like our human brain, consciousness and memory are just neuron networks composed of countless brain cells. Signal transmission is carried out within neurons in the form of electrical signals, and the exchange of information between neurons is through the synapse between two neurons. After the electrical signal in the neuron cell reaches the synapse, it will trigger a nerve impulse. The synapse produces a chemical molecule called a transmitter. The synapse at the other end receives this chemical molecule and converts it into electricity. signals, thus completing the process of material exchange from electrical to chemical to electrical between cells.

As can be seen from the above, our brain is essentially a material form, including the existence of all memories and consciousness.