Do We Not Also Experience Dreams In The Mind? Are We Deceived Into Believing Perceptions, Without Any Material Correlates, To Be Real?

Yes, dreaming is an excellent example to understand the subject. In our dreams, we experience events, see people, objects and settings that seem completely real. However, they are all nothing but mere perceptions. Both of the “dream” and the “real world” are experienced in the brain. While dreaming there is nothing apart from what is in the brain. In the real world, however, the actual matter exists outside us, but we can never reach it and merely know its version perceived in the mind.