Good explanation Ken.  So checking email (or Instagram, etc.) appears to be a 
VI kind of thing - an uncertain amount of time passes and new email (a 
reinforcer) arrives.  But, just for the fun of it, let me add in a wrinkle: 
take Instagram: I don’t necessarily have to do anything - except for initially 
following people when I sign up - but if I post a picture on Instagram (or 
write a post on TIPS I suppose) then the chances of me getting a response are 
increased. So that involves a behavior (posting a text or an image).  Still VI?

Michael

Michael A. Britt, Ph.D.
[email protected]
http://www.ThePsychFiles.com
Twitter: @mbritt



> On Jul 7, 2015, at 8:09 AM, Kenneth Steele <[email protected]> wrote:
> 
> 
> 
> 
> 
>  
> There is an easy trick to distinguish between VI and VR schedules.  First, 
> imagine a FR 25 schedule.  If you double your response rate then you will 
> double your reinforcement rate.  The same rule applies to a VR 25 schedule.  
> On the other hand, imagine a FI 60 sec schedule.  What happens if you double 
> your response rate?  The reinforcement rate will remain about constant 
> because the 60-sec rule must be satisfied for either case.
> 
> The easy way to distinguish between a VI and a VR reinforcement schedule is 
> to imagine the effect of doubling your response rate.  If the reinforcement 
> rate doubles then you are dealing with a VR schedule.  If the reinforcement 
> rate remains about constant then you are dealing with a VI schedule.
> 
> Applying that rule to slot machines and email gives you the following.  
> Doubling the rate at which you enter coins into a slot machine will double 
> the rate at which you receive the consequence, hence a VR schedule.  Doubling 
> the rate at which you check your email will not double the number of emails 
> that you receive, hence a VI schedule.
> 
> Ken
> 
> On Mon, Jul 6, 2015 at 6:41 PM, Beth Benoit <[email protected] 
> <mailto:[email protected]>> wrote:
> 
> 
> 
> 
>  
> I have a video of an interview of Skinner talking about variable ratio 
> schedules as being well exemplified by slot machines.  Wouldn't checking for 
> messages be the same thing?  Sometimes you get one, sometimes you don't.  But 
> not getting one doesn't make you less likely to check.  And sometimes getting 
> one makes you more likely to check.
> 
> Beth Benoit
> Plymouth State University
> Plymouth, New Hampshire
> 
> On Mon, Jul 6, 2015 at 6:35 PM, Michael Britt <[email protected] 
> <mailto:[email protected]>> wrote:
> 
> 
> 
> 
> 
> 
>  
> 
> Parents know how hard it can be for kids to stay away from their social media 
> connections - be it facebook, instagram or Snapchat.  As soon as my 15-year 
> old gets out of swim practice it’s the first thing he does.  After all, there 
> might be a message for him.  This would be variable interval reinforcement if 
> I’m correct - he doesn’t have to actually do anything but a new message 
> (reinforcer) might have arrived.
> 
> It seems pretty darn powerful, which seems weird because I’ve always thought 
> of variable interval reinforcers as weak.  Thoughts?
>    
> Michael
> 
> Michael A. Britt, Ph.D.
> [email protected] <mailto:[email protected]>
> http://www.ThePsychFiles.com <http://www.thepsychfiles.com/>
> Twitter: @mbritt
> 
> 
> 
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> Kenneth M. Steele, Ph.D.                  [email protected] 
> <mailto:[email protected]>
> Professor
> Department of Psychology          http://www.psych.appstate.edu 
> <http://www.psych.appstate.edu/>
> Appalachian State University
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