CH.7 Stimulus Control: Discrimination and Generalization
- Antecedents: stimulus events tht precede an operant response. The antecedents of a behavior
are the stimuli, events, situations, or circumstances, that are present when it occurs or were
present immediately before the behavior.
- it is important to understand the antecedents of operant behavior b.c when we do we have info
on the circumstances in which the behavior was reinforced and the circumstances in which the
behavior was not reinforced for was punished. A behavr continues to occur in situations in
which it has been reinforced or has been punished in the past.
Defining Stimulus Control
- a behavior more likely to occur when a specific antecedent was present. A behavior is under
stimulus ctrl when there is an increased probability tht the behavior will occur in the
presence of a specific antecedent stimulus or a stimulus from a specific stimulus (red
strawberries frm example)
Developing Stimulus Control: Stimulus Discrimination Training
- discriminative stimulus: antecedent is present when a behavior is reinforced
- stimulus discrimination training: the process of reinforcing a behavior only when a specific
antecedent stimulus is present. Involves 2 steps: when sD is present, the behavior is present
AND when any other antecedent stimuli except the sD are present, the behaviour is not
reinforced. During discrimination training, any antecedent stimulus tht is present when the
behavior is not reinforced is called an S-delta.
- As a result of discrimination training, a behavior is more likely to occur in the future when an sD
is present but less likely to occur when an S-delta is present. Presence of an sD does not cause a
behavior to occur; it does not strengthen a behavior. Rather, it increases likelihood of (or
evokes) the behavior in the present situation because it was assoctd with reinforcement of the
behavior in the past, reinforcement is wht causes the behavior to occur when sD is present.
Discrimination training in the Lab
- Holland and Skinner, hungry pigeon peck at disks with green and red keys to get food. They
turned the red light Sd and then whenever