Return of experimentally induced chocolate craving after extinction in a different context: divergence between craving for and expecting to eat chocolate

Unlike in fear conditioning, little attention has been devoted to extinction and renewal in appetitive conditioning, despite its relevance for extinction-based addiction treatments. We developed a paradigm, using a specific tray as a conditioned stimulus (CS) for eating chocolate (unconditioned stimulus, US), to investigate the effects of context change on acquisition and extinction of conditioned chocolate craving using an ABA renewal design. In Study 1 (n=32), participants successfully acquired chocolate craving, but unlike what is commonly observed in fear conditioning, craving did not extinguish. In Study 2, we separately assessed craving and US expectancy in a between-subjects design (n=64). US-expectancy data showed acquisition, extinction and renewal in the ABA group. The craving data did not follow this pattern, suggesting different mechanisms for craving and US expectancy. Similarities and differences between craving and US expectancy, as well as practical implications, are discussed.     

The repeated confrontation with videotapes of spiders in multiple contexts attenuates renewal of fear in spider-anxious students

In a treatment-analogue experiment, extinction of fear of spiders was investigated in a group of spider-anxious students. Two groups were created: in the single extinction group the extinction trials consisted of repeated presentations of a videotaped spider in one specific location of a house, whereas in the multiple extinction group the trials consisted of videotapes of the same spider in three different locations of a house. Also a control group was included that was exposed to videotapes of the location but without the spider. As reflected in skin conductance responses and self-report data, fear of spiders was significantly reduced in the two extinction groups compared to the control group. Moreover, when the extinction groups were confronted with the videotape of the spider in a new location, the single extinction group did not show generalisation of extinction, whereas the multiple extinction group did. These results corroborate the existing evidence for context dependence of extinction of fear and provide new evidence that the use of multiple contexts during extinction might improve the generalisability of extinction in humans. Implications for exposure therapy are discussed.     

Differential acquisition, extinction, and reinstatement of conditioned suppression in mice

In animals, the reappearance of conditioned fear responses after extinction has been primarily investigated using single-cue conditioning paradigms. However, a differential paradigm can overcome several of the disadvantages associated with a single-cue procedure. In the present study, the reinstatement phenomenon was assessed in mice using a differential conditioned suppression paradigm. In a first phase, one conditioned stimulus (CS + ) was consistently paired with an unconditioned stimulus (US; footshock) while another CS (CS-) was not, resulting in selective suppression of previously trained instrumental behaviour during the CS + . After the extinction phase, half of the animals (reinstatement group) were presented with unsignalled USs, while the other half were not (control group). A differential return of conditioned responding was observed in the reinstatement group, but not in the control group. The implications of these findings for future conditioning research are discussed.     

The Effect of Forgiveness on Marital Satisfaction in Relation to Marital Stability

The present study examined the association between forgiveness and marital satisfaction in relation to marital stability. It was a comparative study between first-married and remarried adults involving 787 respondents from the Flanders region in Belgium. The current study showed that, although in the overall forgiveness, there was no significant difference between the first-married and remarried, the first-married significantly differed in two subscales of Enright Forgiveness Inventory (EFI) from the remarried. A significant difference in the marital satisfaction was found between the first-married and remarried adults. The present study also reported a significant positive correlation between forgiveness and general-life adjustment.This study was carried out at the Institute for the Family and Sexuality Sciences, Katholieke Universiteit Leuven, as part of docotral research.     

Religiosity and Marital Satisfaction

This study examined the association between religiosity and marital satisfaction among first-married and remarried adults. Seven hundred and eighty-seven heterosexually married adults from the Flanders region in Belgium completed the Maudsley Marital Questionnaire (MMQ) and a four-item religiosity scale, measuring marital satisfaction and religiosity respectively. This study found the effect of gender and marital status statistically significant (p < .0001) on religiosity. For marital satisfaction, the effect of gender and marital status statistically significant only for MMQ-S (p < .0001) and MMQ-M (p < .0001) respectively. Religiosity had a significant positive correlation (r = .19, p < .0001) with sexual-adjustment problems (MMQ-S). The ultimate aim of this study was to inform marital and relational therapists the value of a possible association religiosity has on marital satisfaction.This study was conducted at the Institute for the Family and Sexuality Sciences, Katholieke Universiteit Leuven, as part of doctoral research.     

Sex differences in college student-teacher interactions: Fact or fantasy?

On-site observations analyzing student-teacher interaction for 50 college classes, matched by level, subject, and teacher's sex, revealed no difference in number and type of interactions in which male and female students participated. In female-taught classes, style differences were found: Male students' interactions were characterized by more student-teacher exchanges than females' interactions. From student questionnaires, differences in office visitation patterns were revealed, showing an apparent relationship to sex: Female students visited more female than male instructors. However, closer examination showed the student's major to be the key variable influencing visitation patterns. Results point to the need for testing a variety of variables in addition to sex before drawing conclusions about sex-related behavior.Ordering of authors was determined alphabetically. A CETA special project grant from the King-Snohomish Manpower Consortium (P. Dee Boersma, principal investigator) funded the research. The authors thank the Institute for Environmental Studies for providing space.     

NeXT in the psychology laboratory: An example of an auditory pattern tracking task

The NeXT computer system is a relatively new, inexpensive, 68040-based computer with high computational power, storage, graphics, audio, and other capabilities. The present article examines the effectiveness of the NeXT for studies of auditory sequential memory. In these studies, subjects track the time of occurrence of a sequence of tones, using a mouse that controls the position of sliders represented on the computer screen interface. This interface allows the subject to represent the different sounds on the y-axis and the time of their occurrence on the x-axis. The computer produces random orders of stimulus sequences, provides feedback, and stores and transforms accuracy and response time data from the slider positions for subsequent analysis. A tutorial for the development of this interface and its variations is provided. As well, procedures for programming the experiment and the operation of the interface are described, accompanied by a frank account of issues surrounding development and management. It is concluded that high-quality sound and ease of both graphics interface design and program modification make NeXT an attractive option for research on auditory sequential order, promising much for further applications as well. Successful use of the NeXT, however, demands much from technical personnel for both programming and system management.     

The development of cued versus contextual conditioning in a predictable and an unpredictable human fear conditioning preparation

In this human fear conditioning study, the online development of conditioned US-expectancy to discrete cues and background contexts was measured in two groups. In the paired group (n=30), the CS was systematically followed by an aversive shock (US). In the unpaired group (n=30), CS and US were presented explicitly unpaired. Using US-expectancy ratings, we replicated the basic finding already illustrated in humans with startle modulation. In the paired group, the CS elicited more US-expectancy than the context, whereas in the unpaired group, the context elicited more US-expectancy than the CS. Interestingly, we also observed a trial-by-trial development of conditioning to the context in the unpaired group as indicated by a significant linear trend. This gradual development and the evidence for the role of US-expectancy in contextual fear add to the idea that cued and contextual fear rely on the same basic associative processes.     

Generalization gradients for acquisition and extinction in human contingency learning

Two experiments investigated the perceptual generalization of acquisition and extinction in human contingency learning. In Experiment 1, the degree of perceptual similarity between the acquisition stimulus and the generalization stimulus was manipulated over five groups. This successfully generated a generalization gradient of acquisition. In the subsequent phase, the response to the generalization stimulus was extinguished in each group. Finally, the acquisition stimulus was presented again. The response recovered differently over groups, thereby establishing the generalization gradient of extinction. In Experiment 2, the acquisition stimulus itself was extinguished before the set of generalization stimuli was tested between groups. One group evidenced a response recovery at test, which suggests that the gradient of acquisition is somewhat broader than the gradient of extinction.