# Reference perception versus target value

**URL:** <http://discourse.iapct.org/t/reference-perception-versus-target-value/9667>\
**Category:** CSG2009\
**Created:** [December 5, 2009, 4:58pm UTC](http://discourse.iapct.org/t/reference-perception-versus-target-value/9667 "2009-12-05T16:58:06Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Arthur\_Dijkstra1](http://discourse.iapct.org/letter_avatar_proxy/v4/letter/a/b9bd4f/32.png) [@Arthur\_Dijkstra1](http://discourse.iapct.org/u/Arthur_Dijkstra1)\
**Post date:** [December 5, 2009, 4:58pm UTC](http://discourse.iapct.org/t/reference-perception-versus-target-value/9667/1 "2009-12-05T16:58:06Z")

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Arthur Dijkstra 2009-12-05

Hi all,

Is there any difference between reference perception and target  
(value) ?

RM: The second kind of “feed-forward” control  
is predictive control, where the prediction occurs in the perceptual function  
and so what is controlled is a perception of the predicted future state of the  
controlled variable.

Can we replace: ‘perception of the predicted state of the  
controlled variable’ by target value ?

Cheers,

Arthur

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<div class="post-metadata">

**Author:** ![Arthur\_Dijkstra1](http://discourse.iapct.org/letter_avatar_proxy/v4/letter/a/b9bd4f/32.png) [@Arthur\_Dijkstra1](http://discourse.iapct.org/u/Arthur_Dijkstra1)\
**Post date:** [December 5, 2009, 5:01pm UTC](http://discourse.iapct.org/t/reference-perception-versus-target-value/9667/2 "2009-12-05T17:01:59Z")

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Arthur Dijkstra 2009-12-05

Hi all,

Is there any difference between reference perception and target  
(value) ?

RM: The second kind of “feed-forward” control  
is predictive control, where the prediction occurs in the perceptual function  
and so what is controlled is a perception of the predicted future state of the  
controlled variable.

Can we replace: ‘perception of the predicted state of the  
controlled variable’ by target value ?

Cheers,

Arthur

---

<div class="post-metadata">

**Author:** ![rsmarken](http://discourse.iapct.org/user_avatar/discourse.iapct.org/rsmarken/32/3553_2.png) [@rsmarken](http://discourse.iapct.org/u/rsmarken)\
**Post date:** [December 5, 2009, 5:17pm UTC](http://discourse.iapct.org/t/reference-perception-versus-target-value/9667/3 "2009-12-05T17:17:32Z")

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[From Rick Marken (2009.12.05..0920)]

> Arthur Dijkstra 2009-12-05

> Hi all,
> 
> Is there any difference between reference perception and target (value) ?

I think of the reference perception as the target for the actual perception.

> RM: The second kind of "feed-forward" control is predictive control, where  
> the prediction occurs in the perceptual function and so what is controlled  
> is a perception of the predicted future state of the controlled variable.
> 
> Can we replace: �perception of the predicted state of the controlled  
> variable� by target value ?

No. The predicted state of the controlled variable is the the  
perception, p, in a predictive system. The control system acts, as  
usual, to bring this value of p to the reference (target) value, r.

Best

Rick

> **···**
>
> --  
> Richard S. Marken PhD  
> rsmarken@gmail.com  
> www.mindreadings.com

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<div class="post-metadata">

**Author:** ![Arthur\_Dijkstra](http://discourse.iapct.org/letter_avatar_proxy/v4/letter/a/f9ae1b/32.png) [@Arthur\_Dijkstra](http://discourse.iapct.org/u/Arthur_Dijkstra)\
**Post date:** [December 5, 2009, 5:18pm UTC](http://discourse.iapct.org/t/reference-perception-versus-target-value/9667/4 "2009-12-05T17:18:15Z")

</div>

Arthur Dijkstra 2009-12-05

Hi all,

Is there any difference between reference perception and target  
(value) ?

RM: The second kind of “feed-forward” control  
is predictive control, where the prediction occurs in the perceptual function  
and so what is controlled is a perception of the predicted future state of the  
controlled variable.

Can we replace: ‘perception of the predicted state of the  
controlled variable’ by target value ?

Cheers,

Arthur

---

<div class="post-metadata">

**Author:** ![Fred\_Nickols1](http://discourse.iapct.org/letter_avatar_proxy/v4/letter/f/ad7895/32.png) [@Fred\_Nickols1](http://discourse.iapct.org/u/Fred_Nickols1)\
**Post date:** [December 5, 2009, 6:37pm UTC](http://discourse.iapct.org/t/reference-perception-versus-target-value/9667/5 "2009-12-05T18:37:30Z")

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[Fred Nickols (2009.12.05.1134 MST)]

> **···**
>
> -------------- Original message ----------------------  
> From: Arthur Dijkstra \<artdijk@XS4ALL.NL\>
> 
> > Arthur Dijkstra 2009-12-05
> > 
> > Can we replace: 'perception of the predicted state of the controlled  
> > variable' by target value ?
> 
> Offhand, I'd say no because the "predicted" state of a controlled variable is not the same as the reference value for that variable. I don't have any difficulty substituting "targeted value" for reference value nor do I have any difficulty substituting "target" or "target variable" for "controlled variable." Indeed, I use and have used those terms for quite some time now. But, as I just indicated, I don't think the predicted state of a controlled variable is the same as the reference state for that variable.
> 
> --  
> Regards,
> 
> Fred Nickols  
> Managing Partner  
> Distance Consulting, LLC  
> nickols@att.net  
> www.nickols.us
> 
> "Assistance at A Distance"