CH 7.docx

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Zachariah Campbell

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
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