Do these results have any value beyond that of psychological description?

This would be the case, if we could superimpose a world of ideas on the perceived world. But in reality the ideas to which we give our assent are valuable only for a period of our lives or for a period in the history of culture. Evidence is never apodictic, nor is thought timeless, though there is some progress in objectification and thought is always valid for more than an instant. The certainty of ideas is not the foundation of the certainty of perception but is, rather, based on it—in that it is perceptual experience which gives us the passage from one moment to the next and thus realizes the unity of time. In this sense all consciousness is perceptual, even the consciousness of ourselves. (MP, 2. The Generalization of These Results)