Plato appears to break down experience into two main categories- experience that is instinctive or biological and experience that is intellectual. He uses the example of the cave dwellers who are in chains against the cave wall for several years of their lives to demonstrate biological/instinctive experience. Because of not being able to turn their heads to see light, their eyes develop so that their pupils are only used to accepting, most likely, the reflections of the fire and shadows of those passing through the cave. Also, their hearing development would largely be contributed to what echoes they heard, versus clear and accurate sounds. Thus, Plato is identifying experience, in this sense, as being based on environmental conditions. Also, Plato references the topics of reality and truth, in relation to this type of experience. What is seen and heard by the people in the cave- the sights of the shadows and sounds of the echoes, are what are true and real to them.

As far as intellectual experience, Plato first addresses the comparison of what is true to those who would come out of the cave versus those who live outside the cave. This, I suppose, represents how intellectual experience can mesh with biological experience. A person who comes from the cave finds that looking at bright light, after a period of time, is positive. In contrast, a person living outside of the cave may realize that it is not good to look directly at bright light, so thus doesn't think it to be positive.
The second type of intellectual experience that Plato identifies deals with the return of people to the cave. This, to me, represents the clashing of beliefs, largely on an intellectual basis. For example, while a person coming out of the cave may believe, as Plato noted, that the sun is the ruler of all, someone living outside of the cave already may know that this is not true.

Plato's beliefs about experience seem to be quite subjective. He suggests that experiences can be derived from both biological and environmental aspects. He then demonstrates the issues that arise from both.