Calkins, M. W. (1914). Perception and imagination as combination and differentiation of elements. In M. W. Calkins, A first book in psychology (pp. 63-86). New York, NY, US: MacMillan Co.
http://dx.doi.org/10.1037/11021-004
It has been shown, in the preceding chapters, that sensational elements may be distinguished within perception and imagination. It is necessary now to emphasize the fact that in ordinary perceiving and imagining one is not aware of these elemental constituents of consciousness, the different qualities, intensities, and extensities. Such analysis is the reflective work of the psychologist, not the immediate experience of the perceiving self. Thus, one's immediate consciousness of a tone is an undistinguished, unitary consciousness, and is not an awareness of a pitch, an intensity and a timbre, though, in after-reflection, we discover these factors in the tone-consciousness, and though it is due to distinguishable physical and physiological conditions. Similarly, the immediate consciousness of a tone sounded simultaneously with its octave is rarely an experience of two tones as distinguishable from each other, though united; indeed, it is often difficult to differentiate these tones even by an effort of attention. The unity of an experience, in this merely negative sense of the absence of differentiation, is often known as fusion. This chapter is organized as follows: Perception and imagination as fusion and assimilation; Perception and imagination as realized combination and differentiation [including: The consciousness of space, The elements of space consciousness, The consciousness of apartness, The consciousness of form (2-dimensional and 3-dimensional form)]; Localization: The consciousness of position; The consciousness of harmony; The consciousness of rhythm and of melody; and finally Perception and imagination as combination of limited groups of sense-elements. (PsycINFO Database Record (c) 2016 APA, all rights reserved)