NEWTON AND PROCLUS: GEOMETRY,IMAGINATION, AND KNOWING SPACE

I aim to clarify the argument for space that Newton presents in De Gravitatione (composed prior to 1687) by putting Newton's remarks into conversation with the account of geometrical knowledge found in Proclus's Commentary on the First Book of Euclid's Elements (ca. 450). What I highlight is that both Newton and Proclus adopt an epistemic progression (or “order of knowing”) according to which geometrical knowledge necessarily precedes our knowledge of metaphysical truths concerning the ontological state of affairs. As I argue, Newton's commitment to this order of knowing clarifies the interplay of the imagination and understanding in geometrical inquiry and illuminates how geometrical knowledge of space can lead to knowledge that space depends on and is related to God. In general, appreciating the Proclean elements of Newton's argument brings added light to the significance of geometrical inquiry for his general natural philosophical program and grants us insight into the philosophical grounding for the notion of absolute space that is presented in the Principia mathematica (1687).     

BASIC PREMISES OF MULTIDIMENSIONAL ATTITUDE CHANGE THEORY: AN EXPERIMENTAL ANALYSIS

Multidimensional attitude change models propose that (1) stimuli defining the domain of attitudes may consist of a multidimensional rather than unidimensional pattern; (2) stimuli associated with each other in the persuasion process will converge with each other in the multidimensional attitude domain. These two propositions receive clear support from three of the hypotheses tested in four-panel cohort data, which analyses show to be multidimensional. The sources of a persuasive message converge on the position they advocate. Multiple sources converge on each other. The findings provided partial support for two other hypotheses on the convergence of self-concept with advocated position and with sources of a persuasive message. A final, somewhat tangential hypothesis also receives clear support: existential associations of concepts are more effective than hortatory associations. These results support further development of multidimensional attitude change models.