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We classified those studies as pre-paradigmatic, quite a few studies on the diffusion of arrowheads and other archeologic evidence. The paradigm, however, coalesced with the Ryan & Gross publication which strongly influenced the Rural Sociology tradition.

From: George Barnett [mailto:[log in to unmask]]
Sent: Monday, December 04, 2017 10:03 AM
To: Thomas William Valente
Cc: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [SOCNET] History and origins of diffusion processes

Tom & Thomas,
   It actually goes back a whole lot further to the work of Galton (cultural trait diffusion), and then  Pemberton (the diffusion of postage stamps) and Stuart Chapin. I haven't looked at the early research in 40+ years, but there was lots of research which preceded Ryan and Gross.

George

 George A. Barnett, Ph.D.
Distinguished Professor Emeritus
Department of Communication
393 Kerr Hall
University of California - Davis
Davis, CA 95616-8695

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On Mon, Dec 4, 2017 at 9:00 AM, Thomas William Valente <[log in to unmask]<mailto:[log in to unmask]>> wrote:
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Thomas
Although this isn't quite what you are looking for, in the 1990-1991 time frame I interview (along with Everett Rogers) a number of early pioneers of diffusion of innovations research. We published our findings in this paper:

Valente, T. W., & Rogers, E. M. (1995). The origins and development of the diffusion of innovations paradigm as an example of scientific growth. Science Communication: An Interdisciplinary Social Science Journal. 16, 238-269.

The abstract reads:
This article traces the emergence of the basic paradigm for early diffusion research created by two rural sociologists at Iowa State University, Bryce Ryan and Neal C. Gross. The diffusion paradigm spread to an invisible college of midwestern rural sociological researchers in the 1950s and 1960s, and then to a larger, interdisciplinary field of diffusion scholars. By the late 1960s, rural sociologists lost interest in diffusion studies, not because it was ineffective scientifically, but because of lack of support for such study as a consequence of farm overproduction and because most of the interesting research questions were thought to be answered.

-Tom

Thomas W. Valente, PhD
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If one looks up the word 'diffusion' in the Dictionary of the History of Science, you get the standard explanation that 'diffusion' originated in the 19th c with Graham and Maxwell and has a Latin etymology in the word, diffundere, which means "to spread out." There has to be more to the story than this, right?

Earlier references might include the  "diffusion of refracted light" in Robert Greene (1727) and "diffusion of light" in Newton's Optical Lectures (1728).

My question for these listservs is, does anyone have any additional insight into the history and origins of the abstract idea of 'diffusion?'

Thank you,
Thomas Ball



Thomas W. Valente, PhD
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Department of Preventive Medicine
Keck School of Medicine
University of Southern California
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