A behavioral economic analysis of concurrently available money and cigarettes.

In economic terms, consumption of a reinforcer is determined by its price and the availability and price of other reinforcers. This study examined the effects of response-requirement (i.e., price) manipulations on the self-administration of two concurrently available reinforcers. Six cigarette smokers participated in 4-hr sessions in which money and puffs on a cigarette were concurrently available according to fixed-ratio schedules of reinforcement. Once stable responding was obtained with both reinforcers available at Fixed Ratio 100, the response requirement for one reinforcer was systematically varied (Fixed Ratio 1,000 and 2,500), while the other reinforcer remained scheduled at Fixed Ratio 100. Increasing the fixed-ratio size for a reinforcer decreased its consumption, with a greater decrease occurring for monetary reinforcement. This finding was quantified in economic terms as own-price elasticity, with elasticity coefficients greater for money than cigarettes. The effects of fixed-ratio size on response output also differed across the two reinforcers. Although greater responding occurred for money at Fixed Ratio 100, increases in fixed-ratio size (for money) decreased responding for money, whereas the same increase in fixed-ratio size (for puffs) increased responding for puffs. Finally, increasing the fixed-ratio size for one reinforcer had little effect on consumption of the other concurrently available reinforcer. This finding was quantified as cross-price elasticity, with elasticity coefficients near 0.0 for most subjects, indicating little or no reinforcer interaction. The results indicate that the reinforcing effects of cigarettes and money in the setting studied here differed, and that the effects produced by changing the price of one reinforcer did not interact with the consumption of the other concurrently available reinforcer.     

Memory Errors From A Change of Standard: A Lack of Awareness or of Understanding?

Memory errors occur when the context standard that is used when judging target behaviors is different from the category norm standard that is available later when the behaviors are recalled. Is insufficient awareness the reason for this change-of-standard effect? Two kinds of awareness were maximized in each of two studies: (a) awareness of the relation between the judgment and the context - telling subjects to be sure to use the non-target persons for comparison when judging the target person (salience); and (b) awareness at recall of the earlier judgmental context - asking subjects to recall the non-target persons before recalling the target person (reinstatement). Context reinstatement reduced memory errors. But when context reinstatement and salience were combined, the memory errors reappeared. In Study 2, an attempt at debiasing failed. The change-of-standard effect is explained in terms of a "natural" tendency to use the current categorical meaning of a judgment to reconstruct the referent of its past contextualized meaning.     

Emergent equivalence relations between interoceptive (drug) and exteroceptive (visual) stimuli.

Conditional "if-then" relations between drug (interoceptive) stimuli and visual (exteroceptive) stimuli were taught to 4 normal humans. Interoceptive stimuli were the effects produced by 0.32 mg/70 kg triazolam (a prototypical benzodiazepine) and placebo (lactose-filled capsules); exteroceptive stimuli were black symbols on white flash cards. Following the training of the prerequisite conditional relations, tests of emergent relations were conducted between exteroceptive stimuli and between interoceptive and exteroceptive stimuli. Equivalence relations emerged immediately without explicit training for all 4 subjects. Accuracy of responding during the interoceptive-exteroceptive equivalence tests and subjects' self-reports showed consistent discrimination between the drug effects of triazolam and placebo. Finally, a generalization test assessed whether a novel visual stimulus presented in the context of the placebo (i.e., no drug) would generalize to visual stimuli belonging to the placebo stimulus class. All 3 subjects who completed this test reliably chose the visual stimuli belonging to the placebo class and not the visual stimuli belonging to the triazolam stimulus class. The development of equivalence relations between interoceptive and exteroceptive stimuli demonstrates that private and public stimulus events can emerge as members of the same equivalence class. Theoretical and clinical implications are discussed.     

Long-term support and personal adjustment of adolescent and older mothers.

Adolescent and older mothers reported the size and quality of social networks and perceptions of family support at 1, 6, and 12 months postpartum. Maternal behavior, general life satisfaction, and parental satisfaction were assessed at 12 months. No significant differences were found in the size of social networks and quality of interactions within those networks, though older mothers had significantly higher scores on perceived family support than did adolescent mothers. Perceived family support and quality of interactions within the social network generally were associated positively with maternal behavior, life satisfaction, and parental satisfaction. This was true in more cases for the adolescent than for older mothers.     

The effects of diazepam and triazolam on repeated acquisition and performance of response sequences with an observing response.

Drugs often disrupt the acquisition of new response sequences at doses that fail to disrupt the performance of a previously acquired response sequence. This selective drug effect may result from differences in the control exerted by the stimuli presented after each response in the acquisition and performance sequences. To examine the function of these stimuli, an observing procedure was incorporated into a multiple schedule of repeated acquisition and performance of response sequences, in which stimulus presentations were contingent upon an observing response. Three experiments were conducted with humans. Experiment 1 compared responding with and without the observing contingency. No difference was found in the overall percentage of errors across the two conditions. Within the observing condition, observing behaviour was maintained in the acquisition component as long as errors occurred, but was not maintained in the performance component. Experiment 2 examined whether a contingency that increased errors also would increase observing in both the acquisition and performance components. Specifically, reinforcer delivery in each component was contingent upon emitting 10 correct responses and one, two, or four errors. Observing responses increased in the acquisition component as the error requirement increased, whereas observing responses in the performance component increased only when the error requirement was four. Experiment 3 assessed the effects of diazepam (0, 7.5, 15, and 30 mg/70 kg, p.o.) and triazolam (0, 0.375, and 0.75 mg/70 kg, p.o.) on repeated acquisition and performance baselines with the observing contingency. Selective drug effects were obtained in this modified procedure; that is, the percentage of errors in the acquisition component increased at doses that failed to affect the percentage of errors in the performance components. Importantly, drug effects were selective, even though observing responses were not emitted in the performance component and, hence, the stimulus presentations did not occur in that component. These findings suggest that alternative explanations for these differential effects are needed; in that regard, a response-unit account of the selective drug effects is discussed.     

The varying presuppositional nature of comparatives

The presuppositional nature of different types of comparatives was studied by obtaining subjects' judgments concerning the synonymity of pairs of comparative statements and the acceptability of single comparative statements. The results indicated that, in general, significantly greater presupposition was involved in the negative comparatives (e.g.,Bob is not as large as Fred) than in the positive comparatives (e.g.,Fred is larger than Bob), in the extreme comparatives (e.g.,Fred is more saintly than Bob) than in the regular comparatives (e.g.,Fred is better than Bob), in the ordinal comparatives (e.g.,Bob is more agile than Fred) than in the ratio comparatives (e.g.,Bob is heavier than Fred), and in the marked comparatives (e.g.,Bob is worse than Fred) than in the unmarked comparatives (e.g.,Fred is better than Bob). The results also indicated that comparative statements containing marked adjectives from a ratio scale can be interpreted neutrally. The implications of these results for the linguistic distinction between marked and unmarked adjectives are discussed. Presuppositions were found to apply equally to the subject and object terms of a comparative statement. In general, the results suggest that presuppositional effects are quite systematic and accumulative in nature.     

Interaction Effect of Extrinsic Rewards and Socioeconomic Strata

In an attempt to account for the poor test performance of lower-SES children, two conflicting theories were examined: (a) the early damage theory holds that lower-SES children have undergone such early and intensive deprivation that they cannot perform in testing situations; (b) the alienation theory contends that the public schools are middle-class institutions with middle-class intrinsic rewards which do not motivate lower-SES children. When faced with the testing situation the children choose not to perform. In order to test these theories, upper- and lower-SES students (N = 250) were randomly assigned to extrinsic and conventional reward conditions. The multivariate analysis of co-variance techniques indicated a significant (.01 level) improvement in the test performance of lower-SES children when extrinsic (money, food) rewards, as well as conventional rewards, are offered. Extrinsic rewards did not significantly improve the test performance of upper-SES children.     

Comments on cognitive science in the experimental analysis of behavior

Arguments are increasingly being made for the inclusion of cognitive science in the experimental analysis of behavior (TEAB). These arguments are described, and a critical analysis of them is presented, especially in regards to the logic of objective inference and the renewed use of cognitive intervening variables. In addition, one particular defining feature of cognitive processes (i.e., the absence of an immediate controlling stimulus) is described, along with alternative points of view stressing molar-molecular levels of analysis and historical causation. Finally, comments are made on the use of cognitive concepts and language in the behavioral sciences. On all of these issues, counter-arguments are based on available material in behavior analysis metatheory, concepts, and experimental practices.