For researchers in perception, cognitive and physiological psychologists, visual research workers, and others.
Chapter I. The problem --
Chapter II. Retinal orientation versus assignment of directions --
Experimental evidence --
Symmetry --
The assignment of directions --
Conclusions --
Chapter III. The assignment of direction factor --
The effect of degree of orientation change on shape --
the perception of tactually disoriented figures --
why does recognition occur at all when directions are incorrectly assigned? --
Chapter IV. The retinal factor --
The basis of perceptual change with change of retinal orientation --
The conditions under which a retinal effect occurs --
Is the retinal factor based on change of retinal orientation? --
Recognition as a function of degree of retinal disorientation --
Chapter V. Discussion --
Theories about orientation of form --
Anisotropy and form perception --
Retinal change and change of assigned directions combined --
The "purpose" of change of appearance in form with change of orientation --
The issue of adaptation to a disoriented retinal image --
Form orientation in children --
Chapter VI. Implications for a theory of form perception --
Implications for the process of recognition --
Chapter VII. Summary and conclusions.