Full Idea
Three features of imagination are that its objects can be abstract, that it generates spatial images directly available to introspection, and its correctness conditions are not based on either efficacious causation or effective tracking.
Gist of Idea
Imagination grasps abstracta, generates images, and has its own correctness conditions
Source
Robert Hanna (Rationality and Logic [2006], 6.6)
Book Reference
Hanna,Robert: 'Rationality and Logic' [MIT 2006], p.193
A Reaction
Hanna makes the imagination faculty central to our grasp of his proto-logic.