Publications of Place that refer to Perky (1910). An Experimental study of imagination.

Place, U. T. (1969c). The outline of a neurophysiological theory designed to account for the mental phenomena as described in ordinary language in which is as far as possible consistent with current physiological and psychological evidence [Unpublished paper, 3/11/69].
[References]  
Download: 1969c The Outline of a Neurophysiological Theory Designed to Account for Mental Phenomena as Described in Ordinary Language.pdf