Use of subjective information in scientific psychology: III. The internal image during visual perception: an introspectionist analysis.

On the basis of personal observation, the writer describes certain characteristics of hypnopompic visual imagery that lead to an understanding of how the internal visual image is experienced. This understanding helps us to see how an internal two-dimensional visual perceptual image could be experienced as an external environment positioned around the observer. The writer suggests how the three-dimensionalized perceptual image is constructed, how it gives the effect of directional looking within the context of seeing widely, and how certain features of visual perception can best be accounted for by the mediation of perception by an internal image.