Spacing extinction trials alleviates renewal and spontaneous recovery

Studies of extinction in classical conditioning situations can reveal techniques that maximize the effectiveness of exposure-based behavior therapies. In three experiments, we investigated the effect of varying the intertrial interval during an extinction treatment in a fear-conditioning preparation with rats as subjects. In Experiment 1, we found less fear at test (i.e., more effective extinction) when extinction trials were widely spaced, relative to intermediate or massed extinction trials. In Experiment 2, we used an ABA renewal procedure and observed that spaced trials attenuated renewal of conditioned fear relative to massed trials. In Experiment 3, we used a similar design, but instead of changing the physical context at the time of testing, we interposed a retention interval after the extinction treatment to produce a change in the temporal context. The results showed less spontaneous recovery of fear after spaced than after massed extinction trials. These results suggest that extinction is more enduring when the extinction trials are spaced rather than massed. Although the benefits of spacing trials are small when there is no contextual change from extinction to testing, a change in either physical or temporal context following massed extinction trials leads to a recovery from extinction, which is reduced when the trials are spaced.     

How environmental knowledge measures up at a Big Ten university

The reported research examines the level of environmental knowledge of Michigan State University students relative to the results of a biannual national study of the environmental knowledge of the general population of the United States. While the university students were found to possess higher levels of environmental knowledge than the general public, the students' overall environmental knowledge, on average, was deficient with only 66% of them receiving a passing grade. The findings suggest a positive correlation between academic level, field of study and environmental knowledge.     

Evaluating teaching effectiveness and teaching improvement: A language for institutional policies and academic development practices

Demands for institutional accountability in higher education have been increasing and have led to greater attention to the evaluation of teaching, the assumption being that improved teaching will result in enhanced learning. In our work as academic developers, we are increasingly helping academic managers make explicit teaching policies and practices that seem fair and equitable. To help us in this work, we have developed a framework for evaluating the practice of teaching. What is unique about this framework is the language it provides to differentiate aspects of teaching. For instance, it provides a basis for differentiating and linking criteria to standards, i.e. the level of achievement desired or expected. Standards are critical if the evaluation of teaching is to be seen as fair and equitable, yet they are often unexamined in other representations of the evaluation of teaching. Although the original intent of our efforts was to provide a framework for academic managers, we have come to find it useful in our own work as university teachers and as academic developers. Examples of all three uses are provided in the paper.     

Associative structure of integrated temporal relationships

According to the temporal-coding hypothesis (TCH; Savastano & Miller, Behavioural Processes 44:147–162, 1998), acquired associations include temporal information concerning the interval between the associated elements. Moreover, the TCH posits that subjects can integrate two independently acquired associations that share a common element (e.g., S2–S1 and S1–US), which results in the creation of a third association with its own temporal relationship (S2–US). Some evidence has suggested that such temporal integration occurs at the time of testing (Molet, Miguez, Cham, & Miller, Journal of Experimental Psychology: Animal Behavior Processes 38:369–380, 2012). Here we report two fear-conditioning experiments with rats conducted to identify the associative structure of the integrated temporal relationship. The goal was to distinguish between two possible associative structures that could exist following an initial test on which temporal integration occurs: (1) Conditioned responding to S2 on subsequent tests could be the result of recurring successive activation of two independently learned temporal maps that remain independently stored in memory (i.e., S2–S1 plus S1–US). (2) Temporal integration at the moment of initial testing could result in the formation of a direct S2–US (or S2–response) temporal map. Integration was found to occur at test and to produce a new association that was independent of associations with the common element (S1). However, the associative status of S1 appeared to modulate whether or not the new association with S2 was US-specific (S2–US) or directly activated a fear response (S2–response).     

The “Crime file” drug videotape series

Critics and proponents alike have voiced concerns about the difficulties of practicing multiculturalism in today's criminal justice classrooms. In this essay we present strategies for using the lived experiences of students as a tool for discovering diversity inside the classroom, as well as for finding value in it. We then use our students' discourse to talk about the impact these strategies can have. Our experiences, as well as those of our students, suggest that principles of multiculturalism can be achieved without having to sacrifice the core curricula; and that one of the more valuable resources for teaching multiculturally is the lived experiences that students, teachers and guests bring into the classroom.