The present study examined the role of response mediation in complex human behavior. Matching, where a constant relation exists between the sample and the comparison stimuli, has been explained in terms of cognitive constructs (Zental, Edwards, Moore, & Hogan, 1981), and the application of a rule (Bucher, 1975). Behavioral accounts have also addressed matching when the comparison and sample stimuli share no formal relation such as identity. Cohen, Brady, & Lowery (1981) studied response mediation in a variety of matching tasks. In the first, pigeons were trained to emit sample-specific behavior (e.g., DRL 3 or FR 16) that was related to specific sample key stimuli. These response-produced stimuli from these behaviors then served as discriminative stimuli for the selection of one of the two comparison keys. For example, the color green evoked key pecking appropriate to an FR 16 schedule, after which the comparison stimuli were displayed and the bird learned to peck a comparison key with a horizontal line. The color orange evoked pecking appropriate to a DRL 3 sec schedule, after which the vertical line was the correct comparison. In addition, they were trained to emit the same samplespecific behaviors to the stimuli when displayed in the reverse. In the presence of a horizontal line the bird pecked appropriate to an FR 16 schedule after which the bird pecked the green key. And in the presence of the vertical line, the bird pecked appropriate to a DRL 3 schedule and then pecked the orange key.The significance of these results was seen when the birds were required to emit the same sample-specific behavior but select comparison keys that were not previously trained. For example, they pecked on an FR16 schedule in the presence of the green-sample key and were then required to peck either a green or an orange comparison key. Up to that point they had not been required to peck comparison keys that shared the same identity as the sample keys. One bird responded with 95 percent accuracy during this identity task without previous training, meaning that the bird pecked the green comparison when shown a green sample, rather than pecking the orange comparison when shown the green sample, due to having acquired the sample-specific behavior for the green key. A control group that were not trained to emit the sample-specific behavior were used to determine whether stimulus mediation without joint control was just as effective in promoting accurate responding during the same task. The results ranged from 28-66% accuracy, with seven out of the ten values falling at exactly 50%, showing that accurate responding in some arbitrary and relational matching was controlled by sample-specific behaviors taught to the birds.Parsons, Taylor, & Joyce (1981) trained kindergarten children to select different comparison keys after pressing corresponding collat-
The Role of Rehearsal in Joint Control
Rick D. Gutierrez, California State University, Los AngelesBehavior analysts have offered accounts of the behavior involved in matching to sampl...