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To decrease a behavior, get it under stimulus control and then 
gradually avoid the stimulus. Example: Condition worry to one 
chair, then sit there less and less.  
Steps  
STEP ONE: Identify the "controlling" response or the controlling 
"conditioned" stimulus preceding the behavior to be changed.  
What response does or could facilitate or interfere with the "target" 
behavior? Suppose you want to discuss current events more with 
friends...or tell more funny stories or jokes. Obviously, "controlling" 
responses might be to do some reading (newspaper, joke book, etc.) 
and rehearsing what you could say and then saying, "Hey, I've got a 
joke for you."  
What very specific situations could be associated with the wanted 
or unwanted "target" behavior? What easily produced stimuli could be 
paired with desired "target" behaviors? Examples: suppose you worry 
a lot, you could limit your obsessing to a particular place and time (say 
a certain chair). Suppose you are frequently critical and suspicious and 
distrusting of others, either openly or secretly. To counteract this 
distorted and inhibiting view of others, you could condition yourself to 
think something positive whenever you are in a certain situation, e. g. 
taking a drink of any liquid. Think positive with every sip and your 
view of others will be conditioned to be more positive.  
STEP TWO: Pair repeatedly the controllable stimulus with the 
"target" behavior.  
Here are some examples: Start limiting your worrying or feeling 
depressed to your "worry chair." Don't restrict the total time spent 
worrying (yet) but do restrict the worrying to that chair, as much as 
possible. This is conditioning the worry with the chair.  
Start pairing a positive, complimentary, trusting thought about 
others with some stimulus, e. g. taking a drink or seeing or thinking of 
a close friend. Eventually, it will become automatic but at first you will 
simply have to keep reminding yourself over and over...or practice by 
taking a sip or thinking of the friend and immediately having a positive 
thought. Prepare in advance a list of accurate, reassuring, caring, 
trusting statements to say to yourself.  
Start smoking a cigarette when a timer's bell sounds, rather than 
when you have the urge or see another person light up, see an ash 
tray, have a beer, etc. Smoke as much as usual, but get it conditioned 
to the bell.  
STEP THREE: Start using the "controlling" response; start 
changing the frequency of the controlling conditioned stimulus.