# Perceptions we don't control

**URL:** <http://discourse.iapct.org/t/perceptions-we-dont-control/8752>\
**Category:** CSG2007\
**Created:** [January 14, 2007, 5:53pm UTC](http://discourse.iapct.org/t/perceptions-we-dont-control/8752 "2007-01-14T17:53:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Richard\_Marken2](http://discourse.iapct.org/letter_avatar_proxy/v4/letter/r/edb3f5/32.png) [@Richard\_Marken2](http://discourse.iapct.org/u/Richard_Marken2)\
**Post date:** [January 14, 2007, 5:53pm UTC](http://discourse.iapct.org/t/perceptions-we-dont-control/8752/1 "2007-01-14T17:53:18Z")

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[From Rick Marken (2007.01.14.0950)]

> Bjorn Simonsen (2007.01.13,23:45 EUST)--
> 
> If there is no reference value, I think it is zero (very near). Then the error becomes negative and that doesn�t work. Therefore the error is zero (very near).

Yes. This is a way to take out a one way control system.

> I think that if the error is very near (not exact) zero there need not be any action and feedback effect. But I can�t explain how there is an action and feedback effect if the error is zero (exact zero).

I was thinking of a situation where the output was a continuous change (like a slow increase) when the error is zero.

> You didn�t answer if we can use the negative feedback loop model if we don�t control a perception. I think we can and we should, but I may be wrong.

Yes, the PCT model can certainly include uncontrolled perceptions.

Best

Rick

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