His book is more about a definition given in the Speculum astronomiae: "[T]he science of images is added to the part of 'elections"'; after an "abominable" type of images and another which is "less unsuitable, but nevertheless detestable," the "Magister Speculi" distinguishes
a third type and devotes his entire work to verifying the existence and history of this (241).
On this point, he distinguishes the case of two of the authors dealt with: Lazaro de Soto and Ildefonso Lopez Pinciano.
For the Salamanca authors, Perez Ibanez distinguishes literary, philosophical, and medical texts, dividing the third category in subcategories: the main authors, that is, Hippocrates, Galen, and Avicenna; GrecoRoman and Byzantine authors; medieval texts; contemporary authors and personal experience.
Since style is a highly personalized matter, he distinguishes the case of each of the Salamanca authors.