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Chapter 7

PSYCO282 Chapter Notes - Chapter 7: Operant Conditioning Chamber, Stimulus Control, Classical Conditioning

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Karsten Loepelmann

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Chapter 7: Stimulus control: discrimination and generalization
The “ABCs” of behaviour in the presence of a particular antecedent cue or signal
(a stimulus such as mom being present), a specific behaviour(asking for money)
will be followed by a certain consequence (you get the money so you only ask
when mom is around). At the same time, a specific EO has to be present like you
have no money at all.
Stimulus control: A behaviour is more likely to occur if a particular antecedent is
present ( i.e. mom being present so you ask for money or red strawberry being
present so you pick them up). Most of the time our behaviours are under this
stimulus control. Why is this? This is because this is the only time that behaviour
will be reinforced and thus likely to repeat in future.
Developing stimulus control: Stimulus discrimination training:
Stimulus discrimination training: administering a certain consequence for a
specific behavior when a particular stimulus is present, but not when another
stimulus is present.
In the presence of the discriminative stimulus (SD), that stimulus that is required
for the behavior to occurs, the behavior is reinforced and is most likely to occur
(or punished and is most likely to be weaken)
in the presence of any other antecedent stimulus (SΔ or “ess delta”), the
behaviour is not reinforced and the behaviour is not likely to occur in future.
Note: SD does not increase the or strengthen behavior, but rather increases the
likelihood of it occurring. The reinforcement is what keep the behavior occurring
Holland & Skinner (1961): pigeon placed in operant conditioning chamber.
when red disk was illuminated and the pigeon pecked it, food was delivered.
Thus, Red lightpecked get food. But when green lightpecked no food. Thus
the red light became and SD due to stimulus discrimination training. Thus
increasing the likelihood that the pigeon will peck when red likght (SD) is
present. But only the food after this reinforces the behaviour.
Developing read and spelling with discrimination traininig: Write
dog(SD)child say dog the teacher praises u ( reinforcement). Other word( S
delta)you say dog no praise and thus this is less likely to occur. Correct is praise
and incorrect is not.
Stimulus discrimination training and punishment:
Red lightpecked get shock. But when green lightpecked no shock. Thus you
are more likely to peck when green light s shining and the red light act as an SD
not to peck as it will produce punishment.
The three-term contingency
Antecedent (SD) behavior consequence (reinforcer or punishment). The SD
develops as stimuli control over the behavior because it is reinforced or punished
only in the presence of that SD.
Stimulus control research:
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