Ahsen, A. (1981). Imagery in hemispheric asymmetries: Research and application. Journal of Mental Imagery, 5, 157-194.

Imagery research and application in the field of hemispheric asymmetries is a complex composite of many strands of information. The research has brought many clarities, but also many confusions and misinterpretations. The latter is especially in evidence at the anatomical level, where research generally presupposes a structure of the human retina and pathways leading into the brain which is not yet proven by anatomical studies. This structure is adopted as an anatomical model in most experimental designs; thus, visual fields are divided geometrically through a vertical meridian, and the spaces to its right and left are theorized as neat anatomical packages of left and right hemispheric representation. According to this model, the macula is also assumed to split neatly into two symmetrical halves, while the anatomical evidence likewise remains unavailable. Many studies thus rely on an unproven anatomical model and employ artifacts which do not attempt a view of hemispherics under natural conditions. This paper examines the current hemispheric research from this standpoint, and an hypothesis which treats the geometric vertical meridian (GVM) as an imaginal vertical meridian (IVM) is advanced. It also outlines a general discussion of concepts and applications of hemisperic research in education and psychotherapy.