Earlier versions of the theory emerged in the context of an application of research on vision to audition, and analogies between vision and audition were emphasised,[1] whereas in more recent writings the necessity of a modality-general theory of perceptual organisation and objecthood is stressed.
[6] PG is considered as a transformation happening between some input and some output.
is considered a set of discrete elements which are distributed over some medium
Media are also termed indispensable attributes (IA).
Kubovy and Van Valkenburg (2003) recommend the following expression for the description of a PP: "... the elements of