A total of 12 elementary school children participated in a study on the effect of percentage in variable amounts of reinforcement under several variable interval schedules. (MS)

Discusses the importance of genetic and epigenetic factors in the development of the nervous system and the performances it conditions. From the perspective of rules, play, and relaxation of rules, learning and education are not considered as a kind of conditioning but as providing a content in which the cumulative expression of potential can take…

Children and adults were trained and tested on formation of novel simple discriminations and conditional stimulus relations. Subjects who formed these sets were trained and tested on formation of stimulus equivalence classes. A modest majority of children matched directly paired stimuli; a few matched indirectly paired stimuli. All normal adults…

Discusses how the mandated phasing out of the most common refrigerant, HCFC R-22, will affect future cooling-system decisions for schools. Address the relevant legislation, environmental implications, possible coolant replacements, and retrofitting systems. (EV)

A guest editorial comments on the acrimonious rhetoric and arguments exhibited in the debate over the use of aversives with individuals with mental retardation. The editorial urges members of the field to refocus their framing of the issues around respect for persons, beneficence, and justice. (JDD)

Focuses on the experimental designs and methodology of 15 studies, most of which used only part of the methodology for the experimental analysis of behavior. Argues that the failure to fully use available research technology may have contributed to researchers' failure to make experimental contact with the definition of reinforcement. (RH)

Treatment of behavioral problems of 3 girls (ages 31-37 months) with Rett's disorder is discussed. Behavioral treatment using operant conditioning principles did little to alter the course of the disorder for these individuals. The one consistent improvement for the girls was a decrease in tantrums. (SW)

Belke and Spetch's (1994) work with pigeons on choice between reliable and unreliable reinforcement is discussed. Hypothetical applied examples address variables that influence preference for unreliable reinforcement, including signaling and its context, conditioned reinforcement, and duration of reinforcement schedules. Implications regarding…

In three experiments using the barpress conditioned suppression task with albino rats, we studied the renewal (relapse) of conditioned fear in an ABA fear-renewal paradigm. We found that explicitly unpaired (EU) deliveries of conditioned stimuli (CSs) and unconditioned stimuli (USs) in Context B thwarted fear renewal in Context A. Evidence…

Latent Inhibition (LI) attenuation when a long delay is introduced between acquisition and test phases has been repeatedly observed using aversive conditioning procedures (e.g., Aguado, Symonds, & Hall, 1994). This effect has been used as evidence to support those theories that consider LI to be the result of a retrieval failure. We designed three…

We asked whether honeybees, "Apis mellifera," could solve a transitive inference problem. Individual free-flying bees were conditioned with four overlapping premise pairs of five visual patterns in a multiple discrimination task (A+ vs. B-, B+ vs. C-, C+ vs. D-, D+ vs. E-, where + and - indicate sucrose reward or absence of it,…

Human conditioning research shows that learning is closely related to consciously available contingency knowledge, requires attentional resources, and is influenced by language. This research suggests a cognitive model in which extinction consists of changes in contingency beliefs in long-term memory. Laboratory and clinical evidence on extinction…

Fear extinction refers to the ability to adapt as situations change by learning to suppress a previously learned fear. This process involves a gradual reduction in the capacity of a fear-conditioned stimulus to elicit fear by presenting the conditioned stimulus repeatedly on its own. Fear extinction is context-dependent and is generally considered…

The present study investigated reinstatement of conditioned responses in humans by using a differential Pavlovian conditioning procedure. Evidence for reinstatement was established in a direct (fear rating) and in an indirect measure (secondary reaction time task) of conditioning. Moreover, the amount of reinstatement in the secondary reaction…

Freezing to a tone following auditory fear conditioning is commonly considered as a measure of the strength of the tone-shock association. The decrease in freezing on repeated nonreinforced tone presentation following conditioning, in turn, is attributed to the formation of an inhibitory association between tone and shock that leads to a…