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Thanks, Rachel. I'll add cortisol to my list.
Cheers,
Charlie
----- Original Message -----
From: Rachel Smith<mailto:[log in to unmask]>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Thursday, February 26, 2009 12:28 PM
Subject: Re: [SOCNET] Facebook and Dunbar number
***** To join INSNA, visit http://www.insna.org<http://www.insna.org/> *****
Well said, Charlie. We're also finding out how communication within social
networks influences biological responses.
* cortisol production: keeping secrets (even advising someone to keep a
secret) increases cortisol production (free salivary), while communicating
affection can lower cortisol production...
Best wishes,
Rachel
Rachel A Smith, PhD
Assistant Professor
Communication Arts & Sciences
Pennsylvania State University
234 Sparks Building (office: 318 Sparks)
University Park, PA 16802
814-863-0030 Fax: 814-863-7986
[log in to unmask]<mailto:[log in to unmask]>
-----Original Message-----
From: Social Networks Discussion Forum [mailto:[log in to unmask]] On
Behalf Of Charles Ehin
Sent: Thursday, February 26, 2009 1:58 PM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: Facebook and Dunbar number
***** To join INSNA, visit http://www.insna.org<http://www.insna.org/> *****
Anthon, thanks for bringing the article to our attention.
http://www.economist.com/science/displayStory.cfm?story_id=13176775&fsrc=nwl<http://www.economist.com/science/displayStory.cfm?story_id=13176775&fsrc=nwl>
ptwfree<about:blank>
I've used the "Dunbar Number" since it's publication in developing many of
my social dynamics models. I believe the Dumber Number can only be
realistically applied to groups that at least occasionally meet
face-to-face. That is because face-to-face interactions also bring into play
hormonal and neurological changes in people involved which are
minimized/excludes in virtual relationships.
The new field of "social neuroscience" in the past 5 years has made some
groundbreaking discoveries (and continues to do so) about our
neurological/chemical activities that take place in our face-to-face
interactions as summarized below:
. Hormones: oxytocin and vasopressin promote trust and bonding.
. Neurotransmitters: dopamine (enhances attention) and serotonin
(reduces fear and worry).
. Mirror cells: reproduces other person's actions/emotions in our
brains.
. Spindle cells: instantly choose best response among many.
. Oscillator cells: regulate how and when bodies move together.
Cheers,
Charlie
Charles (Kalev) Ehin, Ph.D.
Emeritus Professor of Management
The Gore School of Business
Westminster College, Salt Lake City
[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]:[log in to unmask]>>
www.UnManagement.com<http://www.unmanagement.com/<http://www.unmanagement.com%3chttp//www.unmanagement.com/>>
----- Original Message -----
From: E. Anthon Eff<mailto:[log in to unmask]<mailto:[log in to unmask]>>
To: [log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]:[log in to unmask]>>
Sent: Thursday, February 26, 2009 11:02 AM
Subject: [SOCNET] Facebook and Dunbar number
***** To join INSNA, visit http://www.insna.org<http://www.insna.org/<http://www.insna.org%3chttp//www.insna.org/>>
*****
Just-published short article in the Economist (free content) on size of
social networks:
http://www.economist.com/science/displayStory.cfm?story_id=13176775&fsrc=nwl<http://www.economist.com/science/displayStory.cfm?story_id=13176775&fsrc=nwl>
ptwfree<http://www.economist.com/science/displayStory.cfm?story_id=13176775<http://www.economist.com/science/displayStory.cfm?story_id=13176775>&
fsrc=nwlptwfree>
--
E. Anthon Eff, Associate Professor
Dept. of Economics, Middle Tennessee State University
Box X050, Murfreesboro TN 37132
Phone: 615.898.2387
http://www.mtsu.edu/~eaeff/<http://www.mtsu.edu/~eaeff/<http://www.mtsu.edu/~eaeff/%3Chttp://www.mtsu.edu/~eaeff/>>
Natura non facit saltum.
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